Watch Ultra 4
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RANKING
36
Rank 36 out of 37 Summarized in this category Rankings based on: • Pros-to-cons ratio • Number of reviews • Category average

Apple

Watch Ultra 4

price N/A

i
All prices are estimates and may vary from actual prices.

416 Pros

65%
30 reviews (5h 35m)

222 Cons

49%

54 vs 57

Design & Comfort

56%

66 vs 51

Features

80%

61 vs 15

Battery Life

80%

101 vs 25

Health Tracking

48%

10 vs 11

Software/OS

Reviewer verdict

Pros Cons Index analysed 30 YouTube video reviews of the Apple Watch Ultra 4: it earns an Index score of 3.6/5, ranking #36 among Smartwatches. Reviewers most often praise its health tracking, features, battery life, while the most common criticisms concern design & comfort, features.

Pros: A major internal refresh: far better sensors, S11 chip, and noticeably longer battery plus fast charging make the Ultra 4 the most capable Apple smartwatch yet.

Reviewers praise Ultra 4 for a substantial internal upgrade: a redesigned heart-sensing array with much more frequent HR and HRV sampling, a powerful S11 chip with doubled RAM enabling on-device AI, and significantly improved battery life with new Extended workout modes and faster charging. The watch retains full Apple Watch features (cellular, apps, satellite SOS) while adding rugged, adventure-ready hardware, a brighter wide-angle display, and the new Readiness recovery metric — all delivered at the same starting price. For users who want advanced health tracking and multi-day endurance, reviewers call it Apple's best and most capable watch yet.

Cons: Mostly iterative externally and expensive, with some privacy and usability tradeoffs for athletes and Ultra 3 owners.

Common criticisms emphasize the lack of visible redesign and limited upgrade value for Ultra 3 owners: the case and screen look nearly identical, and many software features will back-port or arrive later. Battery life, while improved, still trails multi-week sport watches and some Extended modes reduce live metrics or introduce display delays. Reviewers also flagged comfort/size issues for sleeping, occasional sensor/GPS or reboot quirks, and privacy unease over always-listening audio features — all factors that temper the premium price and make this a less obvious buy for non-enthusiast users.

Analysis based on 30 YouTube reviews (5h 35m of video) with 416 pros and 222 cons extracted.

Pros (416)

Health Tracking (101)
  • Hardware redesign (more skin contact, revamped LEDs/photodiodes) improves data capture. — DesFit · ▶ Watch
  • Heart rate accuracy is much improved over previous Apple Watches and performs very well in many activities (indoor cycling, outdoor rides, trail and road runs). — DesFit · ▶ Watch
  • Performs well in difficult wrist-based HR scenarios like weight training—near parity with external heart rate sensors in tested sessions. — DesFit · ▶ Watch
  • During workouts the watch tracks heart rate every second (reports to display at ~5s intervals), enabling higher-frequency sampling than prior models. — DesFit · ▶ Watch
  • Provides a single-platform solution for health/recovery metrics that previously required third-party apps or separate wearables. — DesFit · ▶ Watch
  • New readiness (recovery) score that is dynamic throughout the day and uses frequent vitals to provide actionable suggestions — CNET · ▶ Watch
  • More frequent heart rate readings (every 5 seconds) and HRV readings (up to every 5 minutes) enabling daytime and nighttime vitals — CNET · ▶ Watch
  • New and much improved sensors on the underside for better health tracking — VideoWaliSarkar · ▶ Watch
  • Heart rate now tracked every ~5 seconds (improved sampling compared to older Apple Watches) — VideoWaliSarkar · ▶ Watch
  • Adds ‘readiness score’ feature (similar to WHOOP) without requiring an extra subscription — VideoWaliSarkar · ▶ Watch
  • Redesigned sensor stack gives much faster readings (instant heart rate readings vs ~10s on Ultra 3) — Ariff Suffian · ▶ Watch
  • Larger electrode area improves ECG skin contact — Ariff Suffian · ▶ Watch
  • Photodiodes rearranged for more efficient light capture — Ariff Suffian · ▶ Watch
  • Larger, more power-efficient green LED maintains accuracy during motion — Ariff Suffian · ▶ Watch
  • Background heart rate sampled far more frequently (every 5 seconds vs every 5 minutes on Ultra 3) — Ariff Suffian · ▶ Watch
  • HRV sampling improved (every 5 minutes vs every 2 hours on Ultra 3) and two HRV metrics (RMSSD and SDNN) are measured — Ariff Suffian · ▶ Watch
  • New Readiness app provides a dynamic daily readiness score based on activity, sleep, and overnight vitals to guide training/recovery — Ariff Suffian · ▶ Watch
  • Score updates throughout the day (responsive to naps, activity, etc.) — Ariff Suffian · ▶ Watch
  • Readiness score feature (recovery tracking) useful for fitness/recovery insight — Jon Adams · ▶ Watch
  • Heart rate scanned in background every ~5 seconds (60x more often) for much better calorie tracking and auto workout starts; Apple claims most accurate heart rate sensing in a wearable for fitness — Max Tech · ▶ Watch
  • HRV tracked every 5 minutes for finally usable HRV data — Max Tech · ▶ Watch
  • Improved sleep tracking expected to be top-tier due to better sensors, faster sampling, and new algorithms — Max Tech · ▶ Watch
  • Readiness feature using sleep and other metrics to tell you when to push or rest (personalized guidance via Apple Intelligence) — Max Tech · ▶ Watch
  • Sleep apnea notifications available on Ultra if you can sleep with the model — Max Tech · ▶ Watch
  • Back uses ceramic and zirconia with a larger sensor array for better skin contact and improved health readings — Andrew Clare · ▶ Watch
  • New sensor measures heart rate every 5 seconds and much more frequent HRV, improving tracking accuracy — Andrew Clare · ▶ Watch
  • Overall better health tracker — Andrew Clare · ▶ Watch
  • Good for sleep tracking because of charging convenience (top-up before bed) — Andrew Clare · ▶ Watch
  • Completely redesigned health sensing system with larger electrode surface for more accurate skin contact — Brian Tong · ▶ Watch
  • Eight photodiodes arranged in a ring (vs four previously) for more accurate readings — Brian Tong · ▶ Watch
  • Larger, more power-efficient green LEDs that support accurate heart-rate measurements even during motion — Brian Tong · ▶ Watch
  • Most accurate heart rate on a watch in the industry (per Apple white paper), with measurements every 5 seconds — Brian Tong · ▶ Watch
  • Measures heart rate variability much more often (about every 5 minutes) enabling better recovery and long-term insights — Brian Tong · ▶ Watch
  • New readiness metric in the Health app that factors sleep, activity, and HRV to give actionable daily guidance — Brian Tong · ▶ Watch
  • Ultra 4 shares the improved sensing and tracking capabilities of the new system (same sensing performance as Series 12) — Brian Tong · ▶ Watch
  • New health features including continuous heart rate tracking and a readiness score — Samuel Nam · ▶ Watch
  • New readiness metric combining sleep, activity, training load, HRV, and recovery to indicate preparedness — Luke Cameron · ▶ Watch
  • New health sensing system with major improvement: background heart rate measurements every ~5 seconds — Luke Cameron · ▶ Watch
  • Much better for tracking HRV and recovery/readiness due to more frequent physiological data — Luke Cameron · ▶ Watch
  • Measures vital signs every night automatically (pulse, breathing rate, wrist temperature, HRV) which is useful for health tracking — TheCaseTester · ▶ Watch
  • New S11 chip and upgraded heart sensor (8 windows vs 4) enabling more frequent heart rate and HRV checks — Adam Talks Tech · ▶ Watch
  • Can check heart rate every 5 seconds and heart rate variability as often as every 5 minutes (new health features) — Adam Talks Tech · ▶ Watch
  • Very accurate heart rate tracking for indoor cycling (spinning), with near-perfect agreement with Polar H10 (correlation ~1.00). — The Quantified Scientist · ▶ Watch
  • Heart rate during weightlifting performed very well (correlation 0.99) with most points close to reference and better than ~94% of devices tested. — The Quantified Scientist · ▶ Watch
  • Overall step counting is very accurate (median difference ~5 steps over ~5,000 steps; individual segment errors small). — The Quantified Scientist · ▶ Watch
  • Improved continuous heart-rate monitoring (more power-efficient sensor allowing roughly 5s sampling) enabling better continuous HR and HRV measurements throughout the day. — The Quantified Scientist · ▶ Watch
  • Improved health and sensing features: improved recovery HRV, high-frequency heart rate sampling (every 5s), readiness app, body age, health sensing system — ZONEofTECH · ▶ Watch
  • Most accurate heart rate sensor claimed (redesigned ECG electrodes with 24% increased surface area for more accurate ECG readings) — DC Rainmaker · ▶ Watch
  • New optical sensor layout: 8 photodiode windows and grouped LED colors (4 green, 4 red, 4 infrared) to improve sensing — DC Rainmaker · ▶ Watch
  • Background heart rate now recorded every 5 seconds (previously every 5 minutes) for improved 24x7 data — DC Rainmaker · ▶ Watch
  • HRV recordings increased to every 5 minutes, enabling HRV in the Vitals app — DC Rainmaker · ▶ Watch
  • Daytime HRV readings exposed to users (industry-first style feature) — DC Rainmaker · ▶ Watch
  • Exposes both RMSSD and SDNN HRV metrics (easier comparison with third-party data and developer access) — DC Rainmaker · ▶ Watch
  • New readiness score (0-10) using activity, training load, overnight vitals, sleep — updates through the day — DC Rainmaker · ▶ Watch
  • Excellent heart rate monitoring (most accurate among current devices per Apple and tests) — haidanghappy · ▶ Watch
  • Sleep tracking performs very well and aligns closely with Garmin for total sleep time and schedule — haidanghappy · ▶ Watch
  • Continuous heart rate measurement (~every 5 seconds) giving higher data density and more reliable analysis — haidanghappy · ▶ Watch
  • Sensor supports ECG readings and more advanced vitals (AFib detection, HRV metrics, daytime vitals) — haidanghappy · ▶ Watch
  • Updated health sensors (3rd generation electrical heart sensor, always-on optical heart sensor, blood oxygen and wrist temperature) with more frequent readings (every 5 seconds) — The Tailoring Talk Magazine · ▶ Watch
  • Improved accuracy of health data could yield better workout/health results (more accurate readings over time) — The Tailoring Talk Magazine · ▶ Watch
  • Redesigned health sensing system with green LED sensor array that takes heart rate readings up to 60x as often and HRV readings 24x as often, claimed to be most accurate on a wearable — TechRadar · ▶ Watch
  • Major health sensor improvements: new optical and electrical heart rate sensors and heart rate reading every 5 seconds. — Matt Gonzalez · ▶ Watch
  • Readiness score that combines sleep, vitals, and training into one useful morning metric. — Matt Gonzalez · ▶ Watch
  • Apple claims most accurate heart rate sensing in any wearable (their testing). — Matt Gonzalez · ▶ Watch
  • New health sensing system with redesigned sensors (more frequent and supposedly more accurate heart-rate monitoring) — zollotech · ▶ Watch
  • Continuous heart rate monitoring roughly every 5 seconds — zollotech · ▶ Watch
  • New readiness app to help understand recovery and training readiness — zollotech · ▶ Watch
  • Shares new heart sensor, S11 chip, and readiness score (advanced health tracking) — Nick Bradley · ▶ Watch
  • Redesigned heart sensor: checks heart rate every 5 seconds and measures HRV up to 24x more often (better health/fidelity) — Nick Bradley · ▶ Watch
  • New readiness score combining sleep, activity, and vitals to recommend recovery/effort — Nick Bradley · ▶ Watch
  • Most accurate step tracking claimed (redesigned pedometer) and new steps complication — Nick Bradley · ▶ Watch
  • Redesigned health sensing system (optical and electrical sensors) enabling more frequent and accurate measurements — 9to5Mac · ▶ Watch
  • Much more frequent HRV measurements (up to 24x more frequent) and added into vitals app — 9to5Mac · ▶ Watch
  • Vitals app now provides continuous daytime and nighttime measurements (more digestible data) — 9to5Mac · ▶ Watch
  • New readiness score that combines activity, training load, vitals and sleep to give actionable guidance — 9to5Mac · ▶ Watch
  • New optical heart-rate sensor takes readings every 5 seconds (much more granular heart monitoring) — Mark's Tech · ▶ Watch
  • Frequent heart-rate readings don't visibly annoy (LED only visible when lifting wrist) — Mark's Tech · ▶ Watch
  • Real-time pedometer complication by Apple (steps update in real time) — Mark's Tech · ▶ Watch
  • Real-time heart-rate complication (shows heart rate on wrist raise) — Mark's Tech · ▶ Watch
  • Accurate sleep, step, and heart-rate tracking (very good sleep detection and fewer false steps) — Mark's Tech · ▶ Watch
  • Updated Health app with more data and a longevity/cardiovascular age score; ability to import labs — Mark's Tech · ▶ Watch
  • Improved health sensors and tracking (new sensor array, larger/more efficient green LEDs, more frequent HR readings every 5s, much more frequent HRV sampling, rebuilt sleep model, improved step tracking) — Tech It Easy · ▶ Watch
  • New readiness feature that combines activity, sleep and vitals into an updating score and advice — Tech It Easy · ▶ Watch
  • Useful new steps complication (live step count on watch face) — Tech It Easy · ▶ Watch
  • New health sensing system that reads heart rate every 5 seconds all day (more frequent and claimed most accurate heart rate sensing) — TheUnlockr · ▶ Watch
  • Thinner sensor bump with bigger green LEDs and larger ECG electrical sensor surface area — TheUnlockr · ▶ Watch
  • New readiness score that aggregates activity, training load, vitals, and sleep to give recovery guidance — TheUnlockr · ▶ Watch
  • Daytime vitals view and much more frequent HRV measurements (up to 25x more often) — TheUnlockr · ▶ Watch
  • Improved health tracking capabilities thanks to a new sensor — The Tech Bros · ▶ Watch
  • More frequent heart monitoring (from ~5 minutes to ~5 seconds) improving heart health tracking — The Tech Bros · ▶ Watch
  • More in-depth, data-rich health and fitness metrics and an overhauled health app with readiness score — The Tech Bros · ▶ Watch
  • Very accurate wearable heart-rate tracking (claimed among the most accurate on the market) — The Tech Bros · ▶ Watch
  • New sensor enables heart rate variability and training readiness features (bringing Apple closer to competitor features) — Alex Vassios · ▶ Watch
  • Improved optical and electrical heart-rate sensors with more frequent HR and HRV sampling enabling new health metrics — Tech Fowler · ▶ Watch
  • New health metrics and views (recovery HRV, overall HRV, overnight vitals, daytime comparison) — Tech Fowler · ▶ Watch
  • Excellent sleep tracking accuracy (Apple Watches consistently accurate) — Tech Fowler · ▶ Watch
  • New readiness score combining activity, sleep, and vitals to give daily recommendations — Tech Fowler · ▶ Watch
  • New heart rate and health sensor records more frequently and is claimed to be the most accurate heart rate sensor in any wearable. — DesFit · ▶ Watch
  • More frequent readings unlock expanded health and recovery feedback (expanded Vitals app and new Readiness feature). — DesFit · ▶ Watch
  • Vitals app now shows HRV and a daytime baseline view that updates throughout the day. — DesFit · ▶ Watch
  • New Readiness feature aggregates sleep, activity, resting HR, and HRV to indicate recovery and updates dynamically through the day. — DesFit · ▶ Watch
Features (66)
  • Retains full smartwatch features (Siri, apps, safety features) while adding stronger sports/endurance capabilities — CNET · ▶ Watch
  • Acts like a proper mobile device: can make calls, more powerful apps and features — VideoWaliSarkar · ▶ Watch
  • New Siri-related features: on-device transcription/meeting assistance (records last ~15s and can transcribe without internet) — VideoWaliSarkar · ▶ Watch
  • Sound recognition for alarms/doorbells/baby cry — accessibility benefit — Ariff Suffian · ▶ Watch
  • Shazam integration (automatic music identification) — Ariff Suffian · ▶ Watch
  • Siri recap feature to summarize conversations and rewind last ~15 seconds — Ariff Suffian · ▶ Watch
  • New S11 chip enables advanced on-device AI features: live rewind (15s), transcription, conversation recaps, on-device sound recognition and background Shazam — Max Tech · ▶ Watch
  • Precision finding for iPhone, double the onboard storage, and media playback through built-in speaker (no AirPods needed) — Max Tech · ▶ Watch
  • Depth gauge and water temperature sensor useful for diving/water activities — Max Tech · ▶ Watch
  • On-device Siri and health integrations that actually work well — Max Tech · ▶ Watch
  • On-device audio features (live rewind, Siri recap) that keep recordings private and localized — Brian Tong · ▶ Watch
  • Native step counter and other watchOS features (AI features / S11 audio intelligence coming) — Samuel Nam · ▶ Watch
  • Control Center shortcuts let you trigger apps/actions (Tesla control, lock car, AC, etc.) — Samuel Nam · ▶ Watch
  • Better notification/live activity integration compared with some competitors (example: Uber details shown on wrist) — Samuel Nam · ▶ Watch
  • New software features (Apple intelligence): live rewind voice recording, Shazam, Siri recap, etc. — Luke Cameron · ▶ Watch
  • Is a very good device if you want notifications, hands-free training, and a watch-as-tool experience — TheCaseTester · ▶ Watch
  • Action button for quick functions (flashlight, assignable actions) — Adam Talks Tech · ▶ Watch
  • Emergency features: siren and Emergency SOS via satellite (phone-independent help) — Adam Talks Tech · ▶ Watch
  • Upcoming Siri Rewind and daily summary features (will be available on Ultra 4 and Series 12) — Adam Talks Tech · ▶ Watch
  • Works well for hiking; author has used it on many hikes including Grand Canyon and Mount Whitney — HikingGuy.com · ▶ Watch
  • Handles some hiking functionality better than Garmin — HikingGuy.com · ▶ Watch
  • Apple Workout app is simple, effective and gets good battery life — HikingGuy.com · ▶ Watch
  • Customizable screens (though not as much as Garmin) — HikingGuy.com · ▶ Watch
  • Hand gestures (double tap, flick to turn screen off, single tap) make it easy to operate hands-free — HikingGuy.com · ▶ Watch
  • Offline Siri works for voice commands (e.g., open Maps) — HikingGuy.com · ▶ Watch
  • Can drop pins/waypoints on the watch and navigate to them (works in airplane mode with offline maps) — HikingGuy.com · ▶ Watch
  • Third‑party apps (Footpath, Workout Outdoors, Goose Maps, etc.) provide strong navigation features including offline maps, GPX import (in some apps), voice/haptic turn alerts and off‑trail alerts — HikingGuy.com · ▶ Watch
  • Safety features: fall detection, satellite SOS/messaging (on Ultra 3/4), siren, non‑emergency satellite messaging — HikingGuy.com · ▶ Watch
  • Check‑in feature to notify someone when you finish (handy in some cases) — HikingGuy.com · ▶ Watch
  • Water Lock + gestures/buttons/action button allow use in wet conditions; flashlight available for emergencies — HikingGuy.com · ▶ Watch
  • Integrates with daily Apple ecosystem (offline Siri, notifications, Find My) which can be useful — HikingGuy.com · ▶ Watch
  • New single-tap gesture and double-tap gesture (one-hand controls) — ZONEofTECH · ▶ Watch
  • Audio intelligence features (live rewind, Siri recap, background jams, sound recognition) — ZONEofTECH · ▶ Watch
  • Adds sleep apnea detection, Siri AI, hypertension notifications, precision finding, improved media playback and Apple intelligence (compared to OG Ultra) — ZONEofTECH · ▶ Watch
  • Health app redesign with AI summaries, longevity tab, health age, V̇O2 max test and other movement/strength assessments — DC Rainmaker · ▶ Watch
  • Audio Intelligence features: sound recognition for alerts (doorbell, baby crying, sirens) for hearing assistance — DC Rainmaker · ▶ Watch
  • Live Rewind: 15-second on-device rolling transcription buffer to view recent audio as text — DC Rainmaker · ▶ Watch
  • Siri Recap: on-device summarization of day/meetings into notes/bullets (no speaker attribution), optional and configurable — DC Rainmaker · ▶ Watch
  • On-device Shazam improvements: near-instant recognition by maintaining a small digital audio signature locally — DC Rainmaker · ▶ Watch
  • Readiness and health features available on watch and mobile app; some features free (AI summaries free) — DC Rainmaker · ▶ Watch
  • New features like readiness score, daytime vitals, and 'Vitals'/fitness metrics expected — haidanghappy · ▶ Watch
  • Live heart rate complication and live footstep counter complication are useful — The Tailoring Talk Magazine · ▶ Watch
  • Siri AI on Ultra 4 works well and provides improved on-watch queries (comparable to lower-tier Claude/ChatGPT) — The Tailoring Talk Magazine · ▶ Watch
  • New audio intelligence features (live rewind, Siri recap, Shazam, sound recognition) expanding functionality on wrist — TechRadar · ▶ Watch
  • New readiness score using health sensing and activity data to estimate energy levels — TechRadar · ▶ Watch
  • Live heart rate and live steps available as complications on the watch face — Alex Vassios · ▶ Watch
  • Overhauled overnight vitals app and many health & fitness features (dual-band L1+L5 GPS, race route, virtual pacers, segments, cycling phone-as-computer) — TechRadar · ▶ Watch
  • Access to a range of third-party apps (Spotify, Audible, AllTrails) plus a clear mic, speaker, Siri, notifications and call management — TechRadar · ▶ Watch
  • Strong smart-watch capabilities: notifications, Apple Pay, HomeKit/unlocked door convenience. — Matt Gonzalez · ▶ Watch
  • Improved Siri on watchOS 10/17 (conversational, follows up, useful). — Matt Gonzalez · ▶ Watch
  • New audio intelligence features (sound recognition, Shazam on watch, future Live Rewind and Siri Recap) — zollotech · ▶ Watch
  • Siri improvements and new Siri Modular watch face (faster, more contextual) — zollotech · ▶ Watch
  • On-device audio features processed in secure enclave (privacy-focused processing) — Nick Bradley · ▶ Watch
  • More microphones and dual speakers with surprisingly good sound — Nick Bradley · ▶ Watch
  • Loud siren feature (86 dB audible up to ~600 ft) for emergencies — Nick Bradley · ▶ Watch
  • Finger gestures (pinch/flick) are useful and enjoyable — Nick Bradley · ▶ Watch
  • Strong running features: easy-to-set custom interval workouts, good comfort, helpful voice cues — Tech It Easy · ▶ Watch
  • Custom workouts available and reliable combination with improved battery for longer use — Tech It Easy · ▶ Watch
  • Ultra 4 offers significant extras over Series 12: >double rated battery, brighter display, dual-frequency GPS, action button, built-in siren, emergency SOS, satellite, recreational scuba to 40m, titanium & sapphire and cellular options — Tech It Easy · ▶ Watch
  • Good speakers with decent depth and strong microphones with effective noise suppression — Tech It Easy · ▶ Watch
  • Seamless integration with other Apple devices and features that 'just work' (notifications, workout handoff to phone) — Tech It Easy · ▶ Watch
  • Audio intelligence features (always-on sound recognition, on-watch Shazam, future Live Rewind and Siri Recap) for convenience and accessibility — TheUnlockr · ▶ Watch
  • Ultra 4 includes dual-frequency GPS (more accurate), satellite messaging/SOS, action button, loud 86 dB siren, 100m water resistance and dive computer (better outdoors/sports features) — TheUnlockr · ▶ Watch
  • New Siri is smart and helpful (on-device processing, fast responses) — Alex Vassios · ▶ Watch
  • Programmable action button useful for workouts and shortcuts — Tech Fowler · ▶ Watch
  • Adventure-focused features (satellite messaging, emergency siren, dive durability) for extreme use — Tech Fowler · ▶ Watch
Battery Life (61)
  • Still achieved multi-day battery life with Always-On display and medium brightness during active use. — DesFit · ▶ Watch
  • Outdoor activity battery claims (≈18 hours) were conservative; reviewer saw ~20 hours of workout tracking. — DesFit · ▶ Watch
  • Combines improved sensor fidelity with better battery life, bringing Apple more in line with competitors for continuous sampling and health metrics. — DesFit · ▶ Watch
  • Bigger battery than previous models — CNET · ▶ Watch
  • Consistently around ~60 hours of general use (exceeds Apple's 2-day estimate) — CNET · ▶ Watch
  • Multiple battery-saving workout modes (Extended and Extended Max) that greatly increase continuous workout tracking time — CNET · ▶ Watch
  • Extended mode: up to 25 hours continuous workout tracking — CNET · ▶ Watch
  • Extended Max mode: up to 45 hours continuous workout tracking — CNET · ▶ Watch
  • Important workout metrics remain available even in aggressive battery-saving modes (enough for ultrarunners or long expeditions) — CNET · ▶ Watch
  • Slightly faster charging: ~18 hours of battery in 15 minutes using included cable — CNET · ▶ Watch
  • Battery life increased from 42 to 50 hours — VideoWaliSarkar · ▶ Watch
  • Fast charging support — 15 minutes charging can give ~18 hours of battery life — VideoWaliSarkar · ▶ Watch
  • Compatible with older Apple Watch chargers (but new fast cable included in box) — VideoWaliSarkar · ▶ Watch
  • Improved battery life: rated up to 50 hours (84 hours in low power mode) — 8 hours more than Ultra 3 — Ariff Suffian · ▶ Watch
  • Strong standby and workout battery figures (18h standard workout, 25h extended, 45h max extended) — can handle long events like a 17-hour Ironman — Ariff Suffian · ▶ Watch
  • Faster charging: 15 minutes gives ~18 hours of normal use — Ariff Suffian · ▶ Watch
  • Much improved real-world battery life thanks to the efficient S11 (A20 Pro) chip — Max Tech · ▶ Watch
  • Faster charging: 30 minutes to 80%, 5 minutes enough for overnight sleep tracking — Max Tech · ▶ Watch
  • Fast charging: ~45 minutes from 0 to 80% — Andrew Clare · ▶ Watch
  • Good battery life: Apple claims 50 hours (more than 2 days); reviewer observed multi-day use and felt battery wasn't a concern — Brian Tong · ▶ Watch
  • Significantly improved battery life (real-world ~71 hours / 3 days vs Ultra 1) — Samuel Nam · ▶ Watch
  • Longer GPS workout time (outdoor GPS from 14 to 18 hours; Apple says up to 45 hours of workout tracking) — Adam Talks Tech · ▶ Watch
  • Marginally better battery life (up to 50 hours vs 42) — Luke Cameron · ▶ Watch
  • Significantly improved battery life (advertised two-day; reviewer got over 50 hours on one charge) — Adam Talks Tech · ▶ Watch
  • Battery increased from 42 to 50 hours; low power mode increased from 72 to 84 hours — Adam Talks Tech · ▶ Watch
  • Good choice for outdoors/extreme sports and for people who hate frequent charging — Adam Talks Tech · ▶ Watch
  • Regular mode battery life sufficient for longest day hikes and possibly short backpacking trips (listed 18 hrs, author getting ~19 hrs) — HikingGuy.com · ▶ Watch
  • New battery modes (Extended and Max Extended) significantly increase GPS+HR recording time (Extended ~25–27 hrs; Max Extended ~45–50 hrs in author testing) — HikingGuy.com · ▶ Watch
  • Fast charging (20W charger gives ~25–30% in 15 minutes) — HikingGuy.com · ▶ Watch
  • Significantly improved battery life (official rating 50 hours; tested ~85–90 hours expected from Ultra 3) — ZONEofTECH · ▶ Watch
  • Faster charging (advertised 80% in 45 minutes) — overall charging speed improved over previous generations — ZONEofTECH · ▶ Watch
  • Extended battery life: Ultra 4 up to ~50 hours (about 2+ days) — DC Rainmaker · ▶ Watch
  • New sport power modes (Extended and Max Extended) increase GPS endurance to 25 hours (extended) and up to 48 hours (max extended) with 1s GPS logging — DC Rainmaker · ▶ Watch
  • Max Extended preserves high-fidelity heart rate recording (but displays 5-minute rolling averages) and keeps 1s GPS fix — DC Rainmaker · ▶ Watch
  • Slightly better battery life than Ultra 3 (few more hours; can last longer with power saving and AOD off) — haidanghappy · ▶ Watch
  • Excellent battery life (claim of 50 hours of normal use validated in testing) — The Tailoring Talk Magazine · ▶ Watch
  • Faster charging (fast charging) so it can be topped up quickly at bedtime — The Tailoring Talk Magazine · ▶ Watch
  • Potential long low-power capability (~84 hours) useful for off-grid/camping — The Tailoring Talk Magazine · ▶ Watch
  • Battery increased by ~6 hours to about 48 hours total, reducing charge anxiety for overnight wear — TechRadar · ▶ Watch
  • Improved battery life (up to 50 hours, up from 42) — zollotech · ▶ Watch
  • Fast charging to 80% in 45 minutes (same as Ultra 3) — zollotech · ▶ Watch
  • Up to 18 hours of outdoor workout battery — zollotech · ▶ Watch
  • Much longer battery life (up to ~50 hours vs ~24 hours on Series 12) — Nick Bradley · ▶ Watch
  • Noticeably improved battery life — rated 50 hours normal use; reviewer gets ~2.5 days with daily workouts — 9to5Mac · ▶ Watch
  • Low power mode can extend battery to 84 hours; extended workout mode up to 45 hours for continuous exercise — 9to5Mac · ▶ Watch
  • Improved battery life in real-world use (roughly an extra half day over previous generation) — Mark's Tech · ▶ Watch
  • Much improved battery life (around 48 hours real-world; spec sheet up to 50 hours) — Tech It Easy · ▶ Watch
  • Extended workout battery modes (up to 18h standard, 25h extended with full GPS/HR, 45h max extended GPS every second) — Tech It Easy · ▶ Watch
  • Fast charging: 80% ~45 minutes; 15-minute charge gives ~12 hours use (6h more than Ultra 3) — Tech It Easy · ▶ Watch
  • Very fast short charging: 5-minute charge gives up to 10 hours of sleep tracking — Tech It Easy · ▶ Watch
  • Excellent standby time (minimal drain when idle) — Tech It Easy · ▶ Watch
  • Longer battery life on Ultra 4 (rated up to ~50 hours; multiple longer workout modes including 25h with full GPS and 45h option) — TheUnlockr · ▶ Watch
  • Faster charging: 15 minutes gives meaningful top-up (Ultra 4 up to 18 hours), and reasonably quick 30–45 minute to 80% times — TheUnlockr · ▶ Watch
  • Significantly improved battery life (quoted ~42h -> ~50h; real-world ~2.5 days) — The Tech Bros · ▶ Watch
  • Fast charging; 15% charge can give many hours of battery (useful quick top-ups) — The Tech Bros · ▶ Watch
  • Best battery life author has seen on an Apple Watch; can last multiple days with certain settings — Alex Vassios · ▶ Watch
  • Reasonable multi-day real-world battery test (Friday evening to Tuesday morning with AOD off) — Alex Vassios · ▶ Watch
  • Good battery even with always-on display on for over a day (example: ~72% at <24 hours) — Alex Vassios · ▶ Watch
  • Significantly improved battery life — around 3 full days in testing; Apple claims up to 50 hours normal use and 84 hours low-power — Tech Fowler · ▶ Watch
  • Fast charging support (Apple claims up to 18 hours from 15 minutes charge) — Tech Fowler · ▶ Watch
  • Battery life improved to a rated 50 hours (up from 42 on Ultra 3) and real-world testing showed ~68–69 hours in mixed active use. — DesFit · ▶ Watch
Design & Comfort (54)
  • Comfortable strap option mentioned (Trail Loop) — good daily wearability — Ariff Suffian · ▶ Watch
  • Comes in new Black Titanium finish and new band colors (e.g., burgundy) — VideoWaliSarkar · ▶ Watch
  • Premium, substantial build — feels like a high-end product — VideoWaliSarkar · ▶ Watch
  • Same case, screen and size as Ultra 3 (familiar design) — Ariff Suffian · ▶ Watch
  • Rugged watch intended for activities (implied suitability for active use) — Samuel Philip Airey · ▶ Watch
  • Natural titanium color hides scratches better and stresses the user less about wear — Samuel Philip Airey · ▶ Watch
  • Natural titanium pairs well with existing titanium/natural-colored bands and other mechanical watches — Samuel Philip Airey · ▶ Watch
  • Worn on right wrist for fitness tracking while still wearing mechanical watches (flexible use case) — Samuel Philip Airey · ▶ Watch
  • New color options and return of a ceramic option at a lower starting price ($899 with cellular) — Max Tech · ▶ Watch
  • Ceramic Shield 2 for much better scratch resistance — Max Tech · ▶ Watch
  • Natural titanium colorway looks classy (preferred over black titanium) — Andrew Clare · ▶ Watch
  • Durable, bulkier design with a larger watch face that many users prefer — Brian Tong · ▶ Watch
  • Thinner bezels compared to Ultra 1 (slight reduction to bezels) — Samuel Nam · ▶ Watch
  • Feels comfortable on the wrist; one of the most comfortable ultra rugged smartwatches — Luke Cameron · ▶ Watch
  • Lighter / nicer to wear compared with big bulky Garmin (more comfortable than big Garmin) — Luke Cameron · ▶ Watch
  • Build quality is really good (titanium, sapphire glass) — TheCaseTester · ▶ Watch
  • Durable build (sapphire front, rated for 100 meters water resistance; reviewer notes Ultra 3 held up well) — Adam Talks Tech · ▶ Watch
  • Comfortable Alpine Loop band with good stretch — Adam Talks Tech · ▶ Watch
  • Physically lighter and more balanced than some Garmin watches; comfortable with trail loop band — HikingGuy.com · ▶ Watch
  • Ceramic and zirconia back (design change) — ZONEofTECH · ▶ Watch
  • New accessories (transparent ocean bands; new colors for loops) — ZONEofTECH · ▶ Watch
  • New bands/colors and Hermes editions; familiar titanium finishes retained — DC Rainmaker · ▶ Watch
  • Appearance is similar to Ultra 3 but certain finishes (natural titanium color) look more compact/attractive and draw positive attention — haidanghappy · ▶ Watch
  • Felt lighter on wrist due to lighter translucent black ocean band (more transparent strap) — The Tailoring Talk Magazine · ▶ Watch
  • Lighter-looking black finish that hides the bezel and improves aesthetics — The Tailoring Talk Magazine · ▶ Watch
  • Retains familiar Ultra design details (raised section, orange accents, action button) and comes in natural and black titanium — TechRadar · ▶ Watch
  • Tough titanium chassis, easy swap bands, and sapphire crystal display — TechRadar · ▶ Watch
  • Action button makes workout starts easy (even if somewhat redundant) — TechRadar · ▶ Watch
  • Available in natural titanium and black titanium (choice of finishes) — zollotech · ▶ Watch
  • Includes Alpine Loop band option with matching colorways — zollotech · ▶ Watch
  • Case is largely identical to previous generation (familiar durable design) — zollotech · ▶ Watch
  • Use of 100% recycled copper in Taptic Engine (environmental/material improvement) — zollotech · ▶ Watch
  • Higher water resistance — Nick Bradley · ▶ Watch
  • Dedicated Action button — Nick Bradley · ▶ Watch
  • Designed for adventures and harsh conditions (tackles the elements) — Nick Bradley · ▶ Watch
  • Good fit for bigger wrists / those who prefer larger watches — Nick Bradley · ▶ Watch
  • Familiar rugged Ultra design with flat sapphire crystal, action button and digital crown (black or natural titanium) — 9to5Mac · ▶ Watch
  • Quality build options and comfortable bands (example: Nomad Strato, titanium feel with silicone comfort) — Mark's Tech · ▶ Watch
  • Compatibility with previous Ultra bands (Ultra 1-3) — Tech It Easy · ▶ Watch
  • Durability: MIL-STD-810H testing, IPX dust resistance, 100m water resistance (40m recreational scuba with app) — Tech It Easy · ▶ Watch
  • Ultra 4 uses titanium case with raised edge around flat sapphire glass for added durability — TheUnlockr · ▶ Watch
  • Ultra 4 provides ruggedness and endurance for outdoor use while Series 12 offers a more discreet, style-friendly option (choice depending on user needs) — TheUnlockr · ▶ Watch
  • Buttons and build feel great — Alex Vassios · ▶ Watch
  • Rugged, durable design suitable for adventures — The Tech Bros · ▶ Watch
  • Familiar proven form factor (design hasn't changed across generations) — The Tech Bros · ▶ Watch
  • Available in black and natural titanium, 49 mm form factor with nice accent color — The Tech Bros · ▶ Watch
  • Good customization options (bands/colors) and a cool aesthetic/size that some users prefer — The Tech Bros · ▶ Watch
  • Familiar durable hardware/design (same as previous Ultras) with titanium option — Alex Vassios · ▶ Watch
  • Natural titanium finish looks better (personal preference) — Alex Vassios · ▶ Watch
  • Compatible with existing larger Apple Watch bands — Alex Vassios · ▶ Watch
  • Alpine Loop band is comfortable (positive band experience) — Alex Vassios · ▶ Watch
  • Very comfortable to wear (can sleep with it, unnoticeable most of the time) — Alex Vassios · ▶ Watch
  • Durability-focused titanium case that feels indestructible — Tech Fowler · ▶ Watch
  • Aggressive, attractive Ultra aesthetic (most watch-like Apple Watch) — Tech Fowler · ▶ Watch
Performance (38)
  • New sensors and new S11 processor for more efficient background tasks — CNET · ▶ Watch
  • Latest S1 chip and doubled RAM (now 4 GB), making it very powerful — comparable to some phones — VideoWaliSarkar · ▶ Watch
  • S11 chip upgrade (derived from A20 Pro) with an always-on processor — performance boost over S10 — Ariff Suffian · ▶ Watch
  • Exclusive features enabled by always-on processor: redesigned pedometer with better accuracy in tricky scenarios — Ariff Suffian · ▶ Watch
  • Performance improved with S11 chip: noticeably snappier, faster, smoother, apps open quickly — Andrew Clare · ▶ Watch
  • S11 chip enables new audio intelligence features and improved power/processing efficiency — Brian Tong · ▶ Watch
  • Improved chip (S11) and more memory (4 GB RAM) for better multitasking/app retention — Samuel Nam · ▶ Watch
  • Usual performance improvements: new chip and 4 GB of RAM (versus 2 GB) — Luke Cameron · ▶ Watch
  • Altimeter is accurate (usually within ~20 ft, often 3–5 ft) — HikingGuy.com · ▶ Watch
  • Maps app is fast, zooms and renders instantly and supports offline maps (download from phone) — HikingGuy.com · ▶ Watch
  • Reliable in practice: author hasn't had it fail, lose tracks, or restart on long hikes — HikingGuy.com · ▶ Watch
  • Comparable or slightly better performance than Apple Watch Series 12 in some activities (e.g., cycling); similar to Ultra 3 for tested activities. — The Quantified Scientist · ▶ Watch
  • Major performance upgrade with S11 chip derived from A20 Pro — ZONEofTECH · ▶ Watch
  • 4 GB of RAM (better multitasking and future-proofing) — ZONEofTECH · ▶ Watch
  • More storage (64 GB) compared with older Ultra 1 (32 GB) — ZONEofTECH · ▶ Watch
  • Second‑gen Ultra band chip — ZONEofTECH · ▶ Watch
  • Arguably Apple's best watch right now (excellent overall) — haidanghappy · ▶ Watch
  • New internal hardware: S11 chip and new Health Sensing System (improved processing and sensing) — haidanghappy · ▶ Watch
  • S11 chip handles larger data volume, AI features and future updates; very powerful processor — haidanghappy · ▶ Watch
  • eSIM support, always‑bright screen, smooth performance—like a miniature iPhone — haidanghappy · ▶ Watch
  • Overall better processor and general performance improvements over Ultra 1 — The Tailoring Talk Magazine · ▶ Watch
  • Overall assessed as a great upgrade from Ultra 1 (screen, battery, processor, health features) — The Tailoring Talk Magazine · ▶ Watch
  • New S11 chipset enabling AI-powered audio intelligence features — TechRadar · ▶ Watch
  • Heart rate and GPS accuracy in testing matched closely with Garmin Fenix 9 Pro and chest-based monitor (within ~2 BPM and distances matched closely) — TechRadar · ▶ Watch
  • Overall described as the smartest, most powerful smartwatch on the market and retains the Ultra crown — TechRadar · ▶ Watch
  • Upgraded S11 CPU (64-bit dual-core) and 64 GB storage — zollotech · ▶ Watch
  • S11 chip with always-on processor enabling new on-device audio intelligence (sound/music recognition, Live Rewind/Siri Recap) — Nick Bradley · ▶ Watch
  • New S11 chip brings snappier performance and smoother UI (notable improvement over Ultra 2) — 9to5Mac · ▶ Watch
  • S11 improves Siri/AI responsiveness and overall fluidity (WatchOS 27) — 9to5Mac · ▶ Watch
  • Massive internal improvements beneath the glass that significantly improve the experience — Mark's Tech · ▶ Watch
  • Improved performance with S11 chip and more fluid app switching; RAM doubled to 4GB — Tech It Easy · ▶ Watch
  • S11 chip and same internal sensors/features across Series 12 and Ultra 4 (identical core experience) — TheUnlockr · ▶ Watch
  • Upgraded internals with S11 chip bringing much better performance — The Tech Bros · ▶ Watch
  • Increased RAM (improvement from previous generation) — The Tech Bros · ▶ Watch
  • Fast, snappy software performance and quicker app loading — Alex Vassios · ▶ Watch
  • Overall recommended: fastest, most powerful Ultra Apple has made (improved responsiveness and battery) — Alex Vassios · ▶ Watch
  • Incredibly polished, iterative improvements; overall best Ultra yet — Tech Fowler · ▶ Watch
  • New S11 chip is faster and more capable (enables future AI features) — Tech Fowler · ▶ Watch
Other (34)
  • Excellent battery life — Apple says up to 50 hours; reviewer gets 3–4 days with theater mode and charges ~2x/week — Jon Adams · ▶ Watch
  • Deep integration with the Apple ecosystem — can carry phone plan on watch and leave phone behind, access notes, books, podcasts, reminders — Jon Adams · ▶ Watch
  • Useful theater mode and flashlight (red) features — preserves battery and avoids waking partner — Jon Adams · ▶ Watch
  • S11 chip with Siri AI — helpful for users who like AI features — Jon Adams · ▶ Watch
  • New optical electrical heart sensor checks heart rate every 5 seconds — improved health monitoring that may detect real problems — Jon Adams · ▶ Watch
  • Good for outdoorsy people — satellite connectivity and outdoor functionality — Jon Adams · ▶ Watch
  • Comfortable fit over time despite larger size — reviewer stopped noticing the size after a few days — Jon Adams · ▶ Watch
  • All-new health sensor array (ring-arranged photodiodes, larger electrodes, bigger efficient green LEDs) — big sensor upgrade since Series 6 — Max Tech · ▶ Watch
  • Design/durability remains excellent — feels indestructible — Andrew Clare · ▶ Watch
  • Improved health features: better ECG readings, sound recognition, readiness scores and daily 0–10 score with recommendations — Andrew Clare · ▶ Watch
  • Excellent battery life — up to ~50 hours with normal settings (matches Apple's claim) — Andrew Clare · ▶ Watch
  • Health sensors and updated back hardware enable more capabilities — worthwhile if you care about health tracking — Andrew Clare · ▶ Watch
  • Fast charging: 15–18 minutes of charge provides many hours of use (e.g., 15 min ≈ 12 hours / 18 min ≈ 18 hours) — Brian Tong · ▶ Watch
  • Most accurate/continuous heart sensor — heart rate tracked once every 5 seconds (much more frequent than previous watches) — Samuel Nam · ▶ Watch
  • Pinch gesture (double pinch) for convenient interactions — dismiss timers/alarms, answer calls without touching the screen — Samuel Nam · ▶ Watch
  • Motivates you to live better (activity rings, stand reminders, stair counts) — psychologically effective — TheCaseTester · ▶ Watch
  • Allows you to look after yourself via passive nighttime data — the real value is in the numbers collected at night — TheCaseTester · ▶ Watch
  • Best Apple Watch Apple has made — big internal updates (new chip, new built‑in heart rate sensors). — Matt Gonzalez · ▶ Watch
  • Health features work well — heart rate sensor works and gives a lot of useful information if you wear it constantly. — Matt Gonzalez · ▶ Watch
  • Good for real‑time use during activities — glanceable screen for heart rate and on‑the‑spot decisions (running, gym, trail). — Matt Gonzalez · ▶ Watch
  • Combines two product halves (health + computer) so it can serve mixed‑use users better than any other product. — Matt Gonzalez · ▶ Watch
  • Bluetooth 5.3 with 5G capability and Wi‑Fi support (2.4 & 5 GHz) — zollotech · ▶ Watch
  • New single and double tap one‑handed gestures for easier control — zollotech · ▶ Watch
  • Very bright display (30,000 nits) with always‑on capability — 9to5Mac · ▶ Watch
  • Faster charging: 0–80% in 45 minutes and ~18 hours of use from a 15‑minute charge — 9to5Mac · ▶ Watch
  • Passive heart rate measurement every 5 seconds and new live heart‑rate complication — 9to5Mac · ▶ Watch
  • Revamped Apple Health app (iOS 27.2) with easier‑to‑read home tab, readiness and longevity features — 9to5Mac · ▶ Watch
  • Longevity tab and health age/bio‑age metrics plus ability to import lab results and run assessments (e.g., VO2 max) — 9to5Mac · ▶ Watch
  • Consolidates many fitness/wellness features into Apple ecosystem — could replace multiple wearables — 9to5Mac · ▶ Watch
  • No price increase — Ultra 4 remains $799 — 9to5Mac · ▶ Watch
  • New audio intelligence features coming (faster Shazam, improved sound recognition, live rewind, Siri recap) — potential useful features — 9to5Mac · ▶ Watch
  • Faster 'burst' charging at low battery levels (quicker top-ups from ~5–40% etc.) — Mark's Tech · ▶ Watch
  • Updated Siri visuals and new Siri features (live rewind, Siri recap) — potentially useful when available — Tech It Easy · ▶ Watch
  • Overall very solid, refined experience — recommended especially within Apple ecosystem — Tech It Easy · ▶ Watch
Display (22)
  • Large, bright, vibrant screen that's visible from different angles — Jon Adams · ▶ Watch
  • Thinner watch with larger display, thinner bezels, much brighter 2000-nit screen and wide-angle OLED for better always-on viewing — Max Tech · ▶ Watch
  • Ultra 4 specific: up to 3000-nit display, better battery life vs prior Ultra, faster recharge, improved GPS, night mode, and built-in satellite emergency — Max Tech · ▶ Watch
  • Display is great: LTPO 3 wide-angle display with 3000 nits brightness — Andrew Clare · ▶ Watch
  • Brighter display (up to 3,000 nits) with larger screen and extra brightness that improves outdoor visibility — Adam Talks Tech · ▶ Watch
  • Touchscreen is bright and readable in direct sunlight and works in rain (with occasional finickiness) — HikingGuy.com · ▶ Watch
  • New LTPO3 wide-angle OLED display (more visible at extreme viewing angles) — ZONEofTECH · ▶ Watch
  • Display can go down to 1 Hz in always-on mode so watch faces update every second — ZONEofTECH · ▶ Watch
  • Thinner bezels and slightly larger usable display area — ZONEofTECH · ▶ Watch
  • Brighter display (up to 3,000 nits) — improves outdoor visibility and flashlight brightness — ZONEofTECH · ▶ Watch
  • Improved OLED screen with much higher peak brightness (3000 nits) — noticeably better in daylight — The Tailoring Talk Magazine · ▶ Watch
  • Liquid Retina OLED display — TechRadar · ▶ Watch
  • Displays remain bright 3000 nit — zollotech · ▶ Watch
  • Larger display with smaller bezels compared to Series 12 — Nick Bradley · ▶ Watch
  • Brighter display (up to 3,000 nits vs 2,000 on Series 12) — Nick Bradley · ▶ Watch
  • Very bright display with up to 3,000 nits peak brightness (excellent outdoors visibility) — Mark's Tech · ▶ Watch
  • Brightness baseline can be lowered to save battery while keeping peak outdoor brightness — Mark's Tech · ▶ Watch
  • Display is punchy, vibrant and excellent always-on implementation — Tech It Easy · ▶ Watch
  • Ultra 4 has much brighter screen (up to 3,000 nits) for better visibility in direct sun — TheUnlockr · ▶ Watch
  • Wider angle display and improved brightness over Ultra 2 — Alex Vassios · ▶ Watch
  • Largest Apple Watch display (49 mm) with flat screen and up to 3,000 nits peak brightness — great visibility in any lighting — Tech Fowler · ▶ Watch
  • Always-on display with night mode (red) to avoid bright light at night — Tech Fowler · ▶ Watch
Connectivity (16)
  • Includes GPS and cellular connectivity as standard — TechRadar · ▶ Watch
  • GPS accuracy is generally very good for running, cycling, and trail runs; total distances matched other devices closely. — DesFit · ▶ Watch
  • Continues to offer satellite navigation and related functionality — VideoWaliSarkar · ▶ Watch
  • Cellular (5G) option for better reception — Max Tech · ▶ Watch
  • Dual speakers and microphone are very good for communication (works well with new Siri AI) — Andrew Clare · ▶ Watch
  • Improved GPS this year (claimed better accuracy than Ultra 3) — Luke Cameron · ▶ Watch
  • Dual-band GPS for better tracking around buildings and trees — Adam Talks Tech · ▶ Watch
  • Core GNSS positioning is very good; GPS supports GPS, BeiDou, QZSS, and Galileo with accurate tracks comparable to Garmin Fenix 8 — HikingGuy.com · ▶ Watch
  • Adds emergency SOS via satellite and 5G support (compared to Ultra 2) — ZONEofTECH · ▶ Watch
  • Very good GPS/map tracking, even in high‑rise buildings and small alleys — haidanghappy · ▶ Watch
  • Apple Watch Ultra 4 tracks maps slightly better than Ultra 3 in the reviewer’s tests — haidanghappy · ▶ Watch
  • Cellular capability: can leave phone at home and still take calls, use maps, stream music, etc. — Matt Gonzalez · ▶ Watch
  • Second-generation ultra wideband chip and satellite connectivity — zollotech · ▶ Watch
  • Built-in satellite capabilities (e.g., Emergency SOS via satellite) — Nick Bradley · ▶ Watch
  • More precise dual-band GPS — Nick Bradley · ▶ Watch
  • Cellular included on every Ultra model (convenience/value depending on Series 12 configuration) — Nick Bradley · ▶ Watch
Value for Money (12)
  • Same pricing as last year ($799) and new strap colors (no price premium) — Ariff Suffian · ▶ Watch
  • No extra subscription required to access health metrics — CNET · ▶ Watch
  • Major refresh with genuinely major upgrades over previous Ultra models (worth considering if you have Ultra 1–3) — VideoWaliSarkar · ▶ Watch
  • Reviewer considers it the best smartwatch you can buy in terms of overall results and capability — VideoWaliSarkar · ▶ Watch
  • Overall: improved daily experience (battery and sensor improvements) making it worth upgrading from Ultra 1/2 and still worthwhile from Ultra 3 — Ariff Suffian · ▶ Watch
  • Mind-blowingly good device / absolutely incredible watch — Jon Adams · ▶ Watch
  • Recommended upgrade for users of very old (first-generation) Apple Watch or those coming from a regular Apple Watch to try an Ultra — Andrew Clare · ▶ Watch
  • Pricing unchanged for Ultra 4 (starts at $799), no price hikes — Brian Tong · ▶ Watch
  • No price increase versus Ultra 3 (costs $799 / £749), which is encouraging for value — TechRadar · ▶ Watch
  • Cheaper than the Garmin Fenix 9 and competitively priced against other top smartwatches — TechRadar · ▶ Watch
  • Worthwhile upgrade for Ultra 3 owners who want continuous health sensing, audio intelligence, and better battery — zollotech · ▶ Watch
  • Overall an excellent high-end smartwatch for users who need rugged/adventure features or want the 'best' Apple Watch — Tech Fowler · ▶ Watch
Software/OS (10)
  • Battery-saving workout modes will be available on Ultra 3 via watchOS 10 update, narrowing upgrade necessity — CNET · ▶ Watch
  • watchOS 27 feels more cohesive and simultaneous with notifications/data — Andrew Clare · ▶ Watch
  • New health app (beta) is nicer and more user-friendly, with useful assessments — Andrew Clare · ▶ Watch
  • Health app redesigned to be more glanceable and easier to use, surfacing insights and readiness scores — Brian Tong · ▶ Watch
  • Improved app ecosystem and watch experience compared to current Android Wear alternatives — Samuel Nam · ▶ Watch
  • Exclusive software features (Readiness score) available on Ultra 4 and Series 12 — Adam Talks Tech · ▶ Watch
  • Recommended upgrade path for Ultra 1 or Ultra 2 owners (those older models lack latest watchOS) — Adam Talks Tech · ▶ Watch
  • watchOS 27 design and smooth integration with Apple's ecosystem — TechRadar · ▶ Watch
  • Setup and data transfer from previous watch is smooth and preserves settings/apps — zollotech · ▶ Watch
  • Both watches run watchOS 10 with Siri AI and convenient input gestures (raise to speak, one-handed tap/double-tap scrolling) — TheUnlockr · ▶ Watch
Fitness Tracking (2)
  • If you care about fitness tracking, the Ultra 4 is strongly recommended — Max Tech · ▶ Watch
  • Redone step counting with ML for indoor distance and claimed most accurate step tracking — TheUnlockr · ▶ Watch

Cons (222)

Design & Comfort (57)
  • Visually looks similar to previous Ultra models (appears the same old Ultra) — CNET · ▶ Watch
  • Comfort: not comfortable to sleep in despite willingness to do so to use features — CNET · ▶ Watch
  • Packaging cable is white (not color-matched to the watch), reviewer expected colored cable for a premium product — VideoWaliSarkar · ▶ Watch
  • Watch design/look may appear the same as previous Apple Watches (looks similar externally) — VideoWaliSarkar · ▶ Watch
  • Design is unchanged from Ultra 3 (same case, screen and size) — limited external changes — Ariff Suffian · ▶ Watch
  • Black anodized finish attracts fingerprints and is difficult to keep clean — Samuel Philip Airey · ▶ Watch
  • Design has awkward crevices/ledges (around the crown) that collect dust and are hard to clean — Samuel Philip Airey · ▶ Watch
  • Fingerprints on the black finish are hard to remove and would require frequent cleaning — Samuel Philip Airey · ▶ Watch
  • Black color causes anxiety about scratching, chipping or wearing off the anodization — Samuel Philip Airey · ▶ Watch
  • User felt they had to baby the watch to avoid scratches, which defeats the purpose of a 'rugged' watch — Samuel Philip Airey · ▶ Watch
  • Accessories (bands) for previous model in natural titanium don't match the black watch, making swapping colors costly or wasteful — Samuel Philip Airey · ▶ Watch
  • Large/thicker than standard Apple Watch models — may be a concern for some users — Jon Adams · ▶ Watch
  • Possible upcoming redesign with magnetic band system could make current purchases feel outdated (and new bands will be expensive) — a reason to wait — Max Tech · ▶ Watch
  • Design has not significantly changed — still thick; hoped for thinner form factor — Andrew Clare · ▶ Watch
  • Action button feels underused/unnecessary for this reviewer and could use rethinking — Andrew Clare · ▶ Watch
  • Ultra 4 is bulkier and heavier—can feel heavy on long hikes — Brian Tong · ▶ Watch
  • Design largely unchanged from Ultra 1 (same titanium case, action button) — not a big visual upgrade — Samuel Nam · ▶ Watch
  • Aesthetically and physically very similar to Ultra 3 (looks like a twin) — little change in design — Luke Cameron · ▶ Watch
  • Screen, connectivity, weight essentially unchanged from previous model — Luke Cameron · ▶ Watch
  • Gets in the way during training (boxing, weight training, gloves) so the training features were unused — TheCaseTester · ▶ Watch
  • Doesn't feel like a 'real' watch or deliver the emotional/ornamental value of a mechanical watch—felt like wearing a toy — TheCaseTester · ▶ Watch
  • Bothers the reviewer at night; wearing through nights is noticeable and not fully comfortable — TheCaseTester · ▶ Watch
  • Feels bulky and heavy (about 63 grams); can be less comfortable initially — Adam Talks Tech · ▶ Watch
  • Sharp edge on top of the body can snag or bump into things — Adam Talks Tech · ▶ Watch
  • Not as comfortable for sleep tracking compared to Series 12 (less ideal to wear overnight) — Adam Talks Tech · ▶ Watch
  • Heavier device (Ultra 4 heavier than Series 12) could affect exercise tracking performance (potential influence on running results). — The Quantified Scientist · ▶ Watch
  • Zirconia back may be softer than sapphire and could scratch more easily — ZONEofTECH · ▶ Watch
  • Ultra 4 is slightly heavier than previous Ultras (about 2 g) — ZONEofTECH · ▶ Watch
  • Black finish is more susceptible to nicks and dents that reveal raw titanium underneath — ZONEofTECH · ▶ Watch
  • Ultra still chunky and bulky; could be uncomfortable and prone to bumping into things — ZONEofTECH · ▶ Watch
  • Design is virtually unchanged since 2022; overdue redesign (same design for four years) — ZONEofTECH · ▶ Watch
  • Not a large visible difference in appearance or day‑to‑day smoothness compared to Ultra 3—limited incentive to upgrade for current Ultra 3 users — haidanghappy · ▶ Watch
  • Despite feeling lighter with the band, the Ultra 4 case itself (without straps) is heavier — likely due to larger battery and different sensor cluster — The Tailoring Talk Magazine · ▶ Watch
  • Only comes in one large size (49 mm), which will look comical on smaller wrists — lack of size options — TechRadar · ▶ Watch
  • Big watch size is the biggest problem for the Ultra series for users with smaller wrists — TechRadar · ▶ Watch
  • Exterior design and case size unchanged (still same 49 mm case) — feels visually the same as prior models. — Matt Gonzalez · ▶ Watch
  • Uncomfortable to wear at night for sleep tracking. — Matt Gonzalez · ▶ Watch
  • Included charging cable is white braided; reviewer wishes for a black version — zollotech · ▶ Watch
  • Case is slightly heavier than Ultra 3 (63 g vs 61.6 g) — zollotech · ▶ Watch
  • Many aspects (design, buttons, crown, display) are unchanged from Ultra 3 — mostly iterative update — zollotech · ▶ Watch
  • Not much new in overall Ultra design (still 49 mm case — large/heavy for some) — Nick Bradley · ▶ Watch
  • Large size may not suit people who prefer smaller watches — Nick Bradley · ▶ Watch
  • International orange accents limit how stylish/versatile the look is for some users — Nick Bradley · ▶ Watch
  • If you prioritize stylish/compact appearance, Ultra's rugged design may be less appropriate — Nick Bradley · ▶ Watch
  • Some premium-looking watch bands (included band) may not feel as premium or versatile — Nick Bradley · ▶ Watch
  • Visually and physically very similar to previous Ultras; minimal external design changes (may not justify upgrade for some) — 9to5Mac · ▶ Watch
  • Some flagship expectations not met given the unchanged external design — Tech It Easy · ▶ Watch
  • On paper the design looks identical to previous generation (no visible chassis/screen changes) — Mark's Tech · ▶ Watch
  • Looks almost identical to Ultra 3 — very little aesthetic change — Tech It Easy · ▶ Watch
  • Heavier than Ultra 3 (noticeable weight difference between color variants) — Tech It Easy · ▶ Watch
  • Included ocean band feels cheap and low quality; complicated buckle; overpriced Apple bands (£100) — Tech It Easy · ▶ Watch
  • Very minor visible sensor array change is the only obvious external difference (mostly hidden) — Tech It Easy · ▶ Watch
  • Ultra 4 is noticeably heavier (about 63 g) compared with Series 12 (about 40 g for 46mm), so you feel the difference on the wrist — TheUnlockr · ▶ Watch
  • Design, colors and overall exterior haven't meaningfully changed (stagnant design across generations) — The Tech Bros · ▶ Watch
  • Occasional wrist pain/fatigue from how the sensor sits (cup/bowl shape) — Alex Vassios · ▶ Watch
  • Black color on Ultra 4 looks less deep/darker than Ultra 3 (more like space gray) — preference issue — Tech Fowler · ▶ Watch
  • Ultra is the least comfortable Apple Watch to sleep with (big, sharp edges catch on pillow/face) — Tech Fowler · ▶ Watch
Features (51)
  • Audio Intelligence feature not yet available and is potentially controversial (privacy concerns) — CNET · ▶ Watch
  • Some features (like readiness) are copied from competitors (WHOOP) — implied lack of originality — VideoWaliSarkar · ▶ Watch
  • Always-on microphone for meeting assistance could be a privacy concern (mics are always on to capture audio for transcription) — VideoWaliSarkar · ▶ Watch
  • Reviewer personally finds constant notifications and frequent charging annoying — may make some users prefer alternatives like WHOOP — VideoWaliSarkar · ▶ Watch
  • Some features (e.g., Siri recap) may have limited availability (not coming to Malaysia soon) — Ariff Suffian · ▶ Watch
  • Siri recap feature implies the watch is always listening, which may concern privacy-conscious users — Andrew Clare · ▶ Watch
  • Some new audio intelligence features (live rewind, Siri recap) may have limited real-world usefulness or feel redundant; utility uncertain until widely available — Brian Tong · ▶ Watch
  • Privacy concerns/unease about always-listening audio features, even though Apple keeps recordings on-device (user may still be wary) — Brian Tong · ▶ Watch
  • Many new AI/watchOS features (Siri watch face) are underwhelming or poor in practice (Siri watch face shows useless complications) — Samuel Nam · ▶ Watch
  • Some exclusive features (readiness score, S11 audio intelligence) may be of limited value or not yet fully rolled out — Samuel Nam · ▶ Watch
  • Pinch gesture existed since Ultra 2, so not unique to Ultra 4 (less novelty if upgrading from Ultra 2/3) — Samuel Nam · ▶ Watch
  • Many new software 'intelligence' features feel gimmicky and may be unused by serious athletes — Luke Cameron · ▶ Watch
  • Notifications were unnecessary for this reviewer — having both phone and wrist buzzed was worse and the small display only shows part of messages — TheCaseTester · ▶ Watch
  • Interest/usefulness declined quickly after initial curiosity (training minutes dropped sharply) — TheCaseTester · ▶ Watch
  • For this reviewer, the display, watch face, and rings are unnecessary — they would prefer a simple band that measures at night (e.g., Whoop) — TheCaseTester · ▶ Watch
  • Readiness feature requires days of sleep data and the watch must be worn to bed to be useful; charging overnight reduces usefulness unless using fast charging during day — Adam Talks Tech · ▶ Watch
  • Workout app lacks built‑in maps/navigation experience (no integrated maps in workout) — HikingGuy.com · ▶ Watch
  • Can't import GPX into Apple Maps (limitation for syncing routes) — HikingGuy.com · ▶ Watch
  • Apple Maps / workout navigation lacks off‑trail alerts and rerouting (missed opportunity) — HikingGuy.com · ▶ Watch
  • Some hiking trails are missing from Apple Maps compared to specialized apps like AllTrails or Gaia GPS — HikingGuy.com · ▶ Watch
  • Certain safety/communication features (check‑in, Find My) have limited usefulness offline or out of cellular range — HikingGuy.com · ▶ Watch
  • Siren range is limited compared with a manual whistle (author estimates ~500 ft clear, less in forest) — HikingGuy.com · ▶ Watch
  • Garmin models have superior built‑in routable offline maps with contour lines, POIs and on‑device planning compared to Apple Watch — HikingGuy.com · ▶ Watch
  • Max Extended mode removes splits, alerts, and custom workouts and shows only 5-minute rolling HR averages on the watch (limits some live feedback) — DC Rainmaker · ▶ Watch
  • Audio Intelligence (live transcription and Siri recaps) raises privacy concerns about 24/7 audio processing and summarization — DC Rainmaker · ▶ Watch
  • Siri Recap summarizes conversations and could capture personal/family interactions — reviewer uncomfortable with always-on summarization — DC Rainmaker · ▶ Watch
  • Potential security/privacy risks with AI summaries and on-device audio handling (concern that secure implementations can fail) — DC Rainmaker · ▶ Watch
  • Fewer detailed workout data points/parameters compared to dedicated fitness watches (e.g., Garmin Fenix series) — haidanghappy · ▶ Watch
  • Unclear real-world usefulness yet of more frequent sensor readings for the reviewer — The Tailoring Talk Magazine · ▶ Watch
  • Siri on watch lacks ability to continue conversations started on the watch (no conversation continuity with iPhone app) — The Tailoring Talk Magazine · ▶ Watch
  • Audio intelligence features (Live Rewind, Siri recap) not yet enabled on the watch — cannot test them and there is potential user concern/backlash about privacy — The Tailoring Talk Magazine · ▶ Watch
  • Some controversy/privacy questions around audio features like live rewind and Siri recap (recording/awareness concerns), though Apple says processing is on-device — TechRadar · ▶ Watch
  • Haven't yet been able to fully test the new audio intelligence features (so their real-world usefulness is unproven in this review) — TechRadar · ▶ Watch
  • Watch faces are underwhelming and less exciting compared to prior year — Tech It Easy · ▶ Watch
  • Some new audio intelligence features are not yet available and will arrive later in beta — zollotech · ▶ Watch
  • Readiness app requires wearing the watch during sleep and may take up to a week to show results (may not suit users who don't sleep with watch) — zollotech · ▶ Watch
  • Audio intelligence platform is still in beta / not yet testable — privacy implications and always‑listening concerns — 9to5Mac · ▶ Watch
  • Siri still unreliable in answers despite visual improvements — Tech It Easy · ▶ Watch
  • Default workout display not very glanceable out of the box — Tech It Easy · ▶ Watch
  • Interval workout alerts lack a run-up warning (only an almost-instant vibration) — Tech It Easy · ▶ Watch
  • Some new Siri/audio features (live rewind, Siri recap) are in beta and not yet fully available; privacy/cloud processing concerns for Siri recap — Tech It Easy · ▶ Watch
  • Some audio intelligence features (Live Rewind, Siri Recap) are coming later in beta, not available immediately — TheUnlockr · ▶ Watch
  • Series 12 has lower peak brightness (2,000 nits) and lower water resistance and fewer outdoor features compared to Ultra (limitation noted as a tradeoff) — TheUnlockr · ▶ Watch
  • Privacy concerns around the new always-listening audio intelligence suite (local processing mitigates but concern remains) — The Tech Bros · ▶ Watch
  • Live Rewind feature could be socially awkward or invasive (records short recent audio to replay) — The Tech Bros · ▶ Watch
  • Siri AI recap / always-listening notes may record sensitive conversations (even if processed locally and auto-deleted after 7 days) — The Tech Bros · ▶ Watch
  • Potential legal/ethical issues or situations where you may not be allowed to bring a device that may be recording — The Tech Bros · ▶ Watch
  • Suite of listening features introduces uncertainties about consent of people around you — The Tech Bros · ▶ Watch
  • Siri always-listening feature raises privacy concerns; cannot be disabled on Ultra 4/Series 12 — Alex Vassios · ▶ Watch
  • Always-listening Siri is invasive for some users—may be a dealbreaker — Alex Vassios · ▶ Watch
  • Privacy concern about upcoming Live Rewind (watch transcribing last 15 seconds of conversation) — Tech Fowler · ▶ Watch
Value for Money (42)
  • High price — not cheap (mentioned around ₹300,000+ in local market) — VideoWaliSarkar · ▶ Watch
  • Implied incremental upgrade for Ultra 3 owners (question whether it's worth upgrading), though author argues it's still worthwhile — may feel marginal to some — Ariff Suffian · ▶ Watch
  • Very expensive — $899 price tag called into question — Jon Adams · ▶ Watch
  • Not worth upgrading for most users — minimal visible differences vs Ultra 3 unless you need advanced heart sensing or AI features — Jon Adams · ▶ Watch
  • Reviewer recommends Ultra 3 as better value; suggests many should skip Ultra 4 due to marginal improvements — Jon Adams · ▶ Watch
  • If you only care about looks, durability, or better battery life, an Ultra 3 may be sufficient — implying marginal value for some buyers to upgrade to Ultra 4 — Max Tech · ▶ Watch
  • If you don't care about new health and AI features, cheaper Series 10/11 on sale or refurbished may be a better value — Max Tech · ▶ Watch
  • Reviewer personally doesn't think the Ultra 4 is worth upgrading to (unless coming from much older models) — Andrew Clare · ▶ Watch
  • Not a compelling upgrade for core tracking (sleep, workout, steps) versus Ultra 1 for many users — doesn't justify $799 price for those features — Samuel Nam · ▶ Watch
  • High price — perceived poor value compared with older Ultra models or Ultra 3 (can get Ultra 3 for much less) — Samuel Nam · ▶ Watch
  • Looks nearly identical to Ultra 3 (minimal external changes) despite $800 price — Adam Talks Tech · ▶ Watch
  • If you already own an Ultra 3, upgrade value is limited (mostly software and sensor/battery improvements; many features already present in Ultra 3) — Adam Talks Tech · ▶ Watch
  • High price relative to Series 12, which offers one-day battery life, more comfort, and lower cost — Adam Talks Tech · ▶ Watch
  • Some apps require subscriptions for full functionality (offline maps, routing) which can add cost — HikingGuy.com · ▶ Watch
  • Pricing: base price high ($799) and much higher for Hermes editions and extra bands — DC Rainmaker · ▶ Watch
  • If you already own Ultra 3 or Ultra 2, it may not be worth the cost to upgrade now — haidanghappy · ▶ Watch
  • If upgrading from a recent model or waiting for audio intelligence features, it might be worth holding off — not necessary to upgrade immediately for everyone — The Tailoring Talk Magazine · ▶ Watch
  • Includes cellular by default, so you're paying for the ability to add it to your phone's data plan even if you don't want cellular — TechRadar · ▶ Watch
  • More specialized options (e.g., Garmin Fenix 9 Pro) may still excel in specific use-cases despite the Ultra's strengths — TechRadar · ▶ Watch
  • High price ($800) for what may be effectively only one of the two halves for many users. — Matt Gonzalez · ▶ Watch
  • Many users only use one half (health or computer) but pay for both — might be overkill/poor value. — Matt Gonzalez · ▶ Watch
  • Apple's direction unclear — company may be rethinking the Watch lineup which makes this model feel like a placeholder. — Matt Gonzalez · ▶ Watch
  • Health‑only trackers (screenless bands) could make this unnecessary for users who only care about health tracking. — Matt Gonzalez · ▶ Watch
  • Shipments declined (Apple Watch shipments dropped 19% in 2024) indicating market challenges for the current approach. — Matt Gonzalez · ▶ Watch
  • If you only care about notifications or basic tracking, cheaper/specialized competitors may serve you better. — Matt Gonzalez · ▶ Watch
  • Not a necessary upgrade if you don't need continuous health sensing or advanced fitness features — zollotech · ▶ Watch
  • Significantly higher base price than base Series 12 (commonly presented as $400 more) — Nick Bradley · ▶ Watch
  • Ultra may be unnecessary if you don't need cellular or premium finish (Series 12/SE3 sufficient) — Nick Bradley · ▶ Watch
  • If coming from Ultra 3, upgrade benefits are smaller (mainly HRV, constant heart rate measurement, readiness score) — may be worth skipping a generation — 9to5Mac · ▶ Watch
  • If upgrading from Ultra 3, not a compelling upgrade — not many must-have changes — Mark's Tech · ▶ Watch
  • If upgrading from an older Ultra expecting big miracles, you may be disappointed — Mark's Tech · ▶ Watch
  • Ultra 4 is significantly more expensive (starts at $799 — roughly twice the price of Series 12) mostly for battery, brightness, and outdoor features — TheUnlockr · ▶ Watch
  • Ultra 4's advantages are mostly in hardware around the core features — inside they're identical, so many users may be paying a premium for external additions rather than extra sensors or software — TheUnlockr · ▶ Watch
  • High price (starts around $799) — expensive purchase — The Tech Bros · ▶ Watch
  • If you already own a recent Ultra or Series watch, the external changes may not justify upgrading (unless you want the new sensors or features) — The Tech Bros · ▶ Watch
  • Most improvements are small/iterative and not a major departure from Ultra 3 — Tech Fowler · ▶ Watch
  • Unclear if worth upgrading / high price ($799) relative to improvements — Tech Fowler · ▶ Watch
  • Many improvements are also available on the cheaper Series 12 or were already on Ultra 3, reducing value proposition — Tech Fowler · ▶ Watch
  • Overlap with Series 12 is growing — many features (new sensors, chip, health features) available on cheaper model — Tech Fowler · ▶ Watch
  • Only meaningful differences from Series 12 are design, battery life, and price — other features aimed at niche/adventure users — Tech Fowler · ▶ Watch
  • High price premium over Series 12 (starts at $799 vs Series 12 $399) — hard to justify for average users — Tech Fowler · ▶ Watch
  • Not a huge difference compared to Ultra 3 — suggests buying Ultra 3 used/new for savings instead of upgrading — Tech Fowler · ▶ Watch
Health Tracking (25)
  • In Extended Max mode some metrics (notably continuous heart rate) are reduced/missing — CNET · ▶ Watch
  • Readiness score lacks history, trends, or graphs — no way to review past scores — CNET · ▶ Watch
  • Readiness score provides limited explanation for underlying reasons (e.g., cycle) and leaves interpretation to the user — CNET · ▶ Watch
  • Heart rate sampling still not as frequent as some competitors (every 5s vs WHOOP every 1s or Fitbit every 3s) — VideoWaliSarkar · ▶ Watch
  • Information overload / 'information anxiety' from too many health metrics (readiness score, frequent tracking) — Jon Adams · ▶ Watch
  • Lack of certain health metrics (blood sugar, blood pressure, some advanced recommendations) compared to some competitors — Brian Tong · ▶ Watch
  • Previous Ultra (Ultra 3) had poor continuous heart rate sampling which motivated switching back to Garmin (implying past reliability issues addressed only now) — Luke Cameron · ▶ Watch
  • Exported health data didn't match what the watch had been showing (implies discrepancies in presented data vs. raw data) — TheCaseTester · ▶ Watch
  • Running heart rate tracking had issues in the first ~5 minutes (correlation dropped to ~0.94), with periods of too-low readings, some too-high spikes, and dropouts. — The Quantified Scientist · ▶ Watch
  • Occasional heart rate dropouts during activities (e.g., brief loss of HR at peaks or segments with no HR recorded). — The Quantified Scientist · ▶ Watch
  • Initial/early firmware or sensor signal-processing may need optimization across users to reduce early-run issues and dropouts (new heart rate sensor looks different and may require further tuning). — The Quantified Scientist · ▶ Watch
  • Company-sponsored accuracy study may be biased; independent verification needed — DC Rainmaker · ▶ Watch
  • Skepticism about study claims — reviewer will run independent tests — DC Rainmaker · ▶ Watch
  • Daytime HRV baseline requires seven days of >=4 hours sleep each night to establish, which can be difficult (e.g., redeye flights) — DC Rainmaker · ▶ Watch
  • Deep sleep measurement can differ significantly from other trackers (example: Ultra 4 showed less deep sleep than Garmin) — haidanghappy · ▶ Watch
  • Occasional measurement errors still occur across high‑end watches (about 7/10 accurate, 3/10 may be off) — haidanghappy · ▶ Watch
  • Watch cannot measure blood pressure (hypertension awareness only alerts, doesn't provide blood pressure measurement) — The Tailoring Talk Magazine · ▶ Watch
  • Readiness score and some advanced metrics require a watch with S11 and the new health sensing system (Ultra 4 or Series 12) — limited to newest watches — 9to5Mac · ▶ Watch
  • Health/training readiness features require several nights of data (forces continuous wear; resets if you miss many nights) — Alex Vassios · ▶ Watch
  • New health metrics are nice but not groundbreaking or necessary for most people — Tech Fowler · ▶ Watch
  • Readiness score requires at least 7 nights of sleep tracking before generating an initial score (delay) — Tech Fowler · ▶ Watch
  • Occasional heart rate blips or failures to lock (examples: a run with first 10 minutes failing to lock, and a 40-second gap during a rower set where no HR was recorded). — DesFit · ▶ Watch
  • Display/reporting of heart rate during workouts can be irregular: although tracked every second, shown/exported readings are at variable ~5s intervals which can be confusing. — DesFit · ▶ Watch
  • Readiness and HRV metrics require at least seven nights of sleep with the watch to establish baselines, and wearing the watch consistently is necessary for best results. — DesFit · ▶ Watch
  • Some uncertainty about the practical usefulness of the daytime HRV baseline (may not always show a number when active and usefulness not fully determined). — DesFit · ▶ Watch
Battery Life (15)
  • Extended battery modes introduce slower 'race to wake' display — delay getting stats on screen which can be risky on trails — CNET · ▶ Watch
  • Cannot test full 45-hour claim in review; real-world validation limited — CNET · ▶ Watch
  • Still not competitive with dedicated sport watches like Garmin in raw battery longevity (Garmin offers weeks vs Apple’s ~60 hours) — CNET · ▶ Watch
  • Battery life and charging remain a user pain point for Apple Watches generally (need frequent charging compared to some competitors like WHOOP) — VideoWaliSarkar · ▶ Watch
  • Battery life, while improved, still not as long as some dedicated devices (e.g., Garmin) that do fewer things — Brian Tong · ▶ Watch
  • Only marginal battery improvement; still requires charging roughly every other day — Luke Cameron · ▶ Watch
  • Practical charging problem: hard to find a charging window because you want to wear it during day and track sleep at night, making it feel like a chore — TheCaseTester · ▶ Watch
  • If you need more battery life without charging thinking, Garmin devices still win (longer always‑on battery) — HikingGuy.com · ▶ Watch
  • Real-world charging did not meet Apple's advertised 80% in 45 minutes (tester saw ~50–60%) — ZONEofTECH · ▶ Watch
  • Still relatively slow charging by today's standards despite improvements — ZONEofTECH · ▶ Watch
  • Unclear battery impact of always-on audio intelligence features; Apple did not provide full answers about battery life with these enabled — DC Rainmaker · ▶ Watch
  • Battery capacity not increased significantly; expected ~2 days typical, only slightly better than Ultra 3 — haidanghappy · ▶ Watch
  • Extra battery life may be less compelling because fast charging and short daily top-ups (10–15 minutes) mitigate battery concerns — Nick Bradley · ▶ Watch
  • Battery life improvement is modest — only about an extra half day in typical use (not multi-day) — Mark's Tech · ▶ Watch
  • Battery life, while best for Apple Watch, still lags far behind dedicated Garmin devices — Alex Vassios · ▶ Watch
Software/OS (11)
  • Some health app features (revamp, AI features) will be delayed — rolling out later in the year and initially English/beta — DC Rainmaker · ▶ Watch
  • Many software/features may be back‑ported via watchOS update to Ultra 3/2, reducing upgrade value — haidanghappy · ▶ Watch
  • Small board of third-party apps available compared with other platforms (limited app ecosystem) — TechRadar · ▶ Watch
  • Not all new features are available to users — requires newer software/hardware (ecosystem limitations) — 9to5Mac · ▶ Watch
  • To get the revamped Health app you need an Apple Intelligence‑enabled iPhone (iPhone 15 Pro or newer) — older iPhones see old app — 9to5Mac · ▶ Watch
  • Many of the improvements (health features, S11 chip) are also available on other models/require watchOS 27 or an Apple intelligence-enabled iPhone, so not Ultra 4 exclusive — Tech It Easy · ▶ Watch
  • Limited customization of action/digital crown/side button long-press behaviors (wishes for more programmability) — Alex Vassios · ▶ Watch
  • Adaptive app/recommended apps interface removes muscle memory and may be less preferable — Alex Vassios · ▶ Watch
  • Dictation issues: sometimes stops and triggers Siri instead of sending message (frustrating bug) — Alex Vassios · ▶ Watch
  • System instability: reported random crashes/restarts (watch going black and rebooting while using apps like Calendar) — Alex Vassios · ▶ Watch
  • Features like new audio intelligence and some Health app updates were not available at time of filming (not yet released). — DesFit · ▶ Watch
Performance (8)
  • Not a compelling upgrade from Apple Watch Ultra 3 — connectivity issues noted and overall experience similar — Andrew Clare · ▶ Watch
  • Random reboot/shutdown experienced during use (unexpected reboot) — Samuel Nam · ▶ Watch
  • Some performance improvements may be meaningless to many athletes (won't notice new chip/RAM in practice) — Luke Cameron · ▶ Watch
  • Occasional device restarts have occurred (rare), and some map/offline operations have caused restarts for the author — HikingGuy.com · ▶ Watch
  • Max Extended reduces GNSS from multiband to single band (potentially reduced GPS precision) — DC Rainmaker · ▶ Watch
  • Noticed some slowdown when using Siri for timers and reminders (performance stutter) — The Tailoring Talk Magazine · ▶ Watch
  • Sensor accuracy improvements are claimed but the reviewer couldn't see a significant real-world difference versus Ultra 3 — Tech It Easy · ▶ Watch
  • S11 speed improvements are noticeable but not dramatic in everyday use — Tech Fowler · ▶ Watch
Display (6)
  • Touchscreen can be accidentally pressed with wet long sleeves; touch can be finicky in rain — HikingGuy.com · ▶ Watch
  • Using the touchscreen in very sloppy/cold conditions or with gloves is less convenient than Garmin's physical buttons — HikingGuy.com · ▶ Watch
  • If upgrading from Ultra 3, display changes are minimal (not a major new feature) — ZONEofTECH · ▶ Watch
  • Display possibly slightly smaller than Ultra 3 (49 mm vs 51 mm) though not a major difference — 9to5Mac · ▶ Watch
  • Display brightness hasn't meaningfully increased since Ultra 3 (missed opportunity) — Tech It Easy · ▶ Watch
  • On-paper brightness comparison favors competitors (example: Galaxy Watch Ultra 2), so extreme peak brightness advantage is limited — Tech It Easy · ▶ Watch
Fitness Tracking (4)
  • Occasional accuracy drift in edge cases (previous Apple Watches showed issues during strength training and high-intensity interval training). — DesFit · ▶ Watch
  • Some cycling distances were slightly shorter than other devices (small discrepancies). — DesFit · ▶ Watch
  • Larger/heavier watches (physics) may be less accurate than smaller watches even with same sensor due to wrist movement. — DesFit · ▶ Watch
  • Some activities still produce occasional inaccuracies or cadence lock issues at the end of workouts. — DesFit · ▶ Watch
Connectivity (3)
  • GPS tracks sometimes lack fine detail (e.g., not perfectly matching sidewalk position or slightly less detailed segments). — DesFit · ▶ Watch
  • GPS tracking behaved oddly on the tested run with large deviations and non-overlapping tracks (signals 'all over the place'), possibly a bug or unit/firmware issue. — The Quantified Scientist · ▶ Watch
  • Wi‑Fi remains Wi‑Fi 4 (older Wi‑Fi standard) — zollotech · ▶ Watch

Review sources

Frequently asked questions

Is the Apple Watch Ultra 4 worth buying?

Based on 30 independent YouTube reviews, the Apple Watch Ultra 4 scores 3.6/5 with 416 positive and 222 negative points mentioned by reviewers, placing it #36 in the Smartwatches category.

What do reviewers like most about the Apple Watch Ultra 4?

The most praised aspects are health tracking, features, battery life — Health Tracking (101 mentions), Features (66 mentions), Battery Life (61 mentions).

What are the most common complaints about the Apple Watch Ultra 4?

Reviewers most frequently criticize design & comfort, features — Design & Comfort (57 mentions), Features (51 mentions).

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