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Apple Watch Ultra 4 is an evolutionary upgrade focused on health sensing, training readiness and longer battery life—not a major redesign. It starts at $799 in the U.S. and is most compelling for buyers who want those additions or are moving from an older watch. Ultra 3 owners have less reason to upgrade unless the new sensing features or endurance claims address a specific need.
What’s new in Apple Watch Ultra 4?
Apple announced Ultra 4 on September 9, 2026, and U.S. availability began September 18. Apple says the watch adds a new Health Sensing System, an S11 chip, a readiness score, more frequent heart-rate and heart-rate-variability (HRV) measurements, and longer battery life. It comes in natural or black titanium. The design, however, looks much like Ultra 3, according to Jane McGuire’s Tom’s Guide review.
Apple’s U.S. starting price is $799. Regional pricing and availability may differ; check Apple’s product page for current local details.
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| Detail | Apple Watch Ultra 4 |
|---|---|
| U.S. starting price | $799 (Apple, 2026) |
| Case | Grade 5 titanium; 49 mm high, 44 mm wide and 12 mm deep |
| Chip and storage | S11; 64 GB |
| Finishes | Natural titanium and black titanium |
| In the box | Watch, band and one-meter Apple Watch Magnetic Fast Charger to USB-C Cable |
These specifications are listed by Apple; see its technical specifications for the full feature and compatibility details.
#1 Best Overall
![Apple Watch Ultra [GPS + Cellular 49mm] Titanium Case with Midnight Ocean Band, One Size (Renewed)](https://m.media-amazon.com/images/I/41NQgyV24pL._SL160_.jpg)
- WHY APPLE WATCH ULTRA - Rugged and capable, built to meet the demands of endurance athletes, outdoor adventurers, and water sports enthusiasts - with a specialized band for each. Up to 36 hours of battery life, plus all the Apple Watch features that help you stay healthy, safe, and connected.
- EXTREMELY RUGGED, INCREDIBLY CAPABLE - 49mm corrosion-resistant titanium case. Larger Digital Crown and more accessible buttons. 100m water resistance. Customizable Action button for instant physical control over a variety of functions.
- BIGGEST, BRIGHTEST DISPLAY YET- A bright Always-On Retina display that’s easy to see, even in direct sunlight. More room for adding complications to customize your watch face.
- FOR ENDURANCE ATHLETES - Advanced metrics in the Workout app, including Heart Rate Zones and Running Form. Precision dual-frequency GPS for accuracy, distance, route, and pace calculations. Trail Loop band is thin, light, and flexible, designed especially for runners.
- FOR OUTDOOR ADVENTURERS - Redesigned Compass app delivers all-new views and functionality. Mark your location with Compass Waypoints. Backtrack uses GPS to map where you’ve been so you can retrace your steps. Alpine Loop band is extremely rugged and secure to meet the needs of hikers and climbers.
How long does the battery last?
Apple gives several battery figures, each tied to a particular use pattern. They are manufacturer test results, not a guarantee of what every owner will get. Apple says tests used preproduction watches and prerelease software, and that actual battery life varies with use and other conditions.
| Use case | Apple’s stated duration | What to know |
|---|---|---|
| Outdoor workout tracking, Extended Workout | Up to 25 hours | Apple’s workout testing took place in July and August 2026 on preproduction watches with prerelease software. |
| Outdoor workout tracking, Max Extended Workout | Up to 45 hours | Uses Low Power Mode, turns off alerts and splits, and makes some metrics unavailable. It is not a normal all-features GPS workout estimate. |
| Multi-day use | 50 hours | Apple’s figure is based on a defined test pattern, not continuous workout tracking. |
| Low Power Mode | Up to 84 hours | A separate Apple test pattern applies; this is not the same scenario as the 50-hour figure. |
Apple’s product page and technical specifications describe the conditions behind these figures. In her September 2026 Tom’s Guide review, McGuire says she got more than two days in her own use, including a day with three and a half hours of workouts and messaging. That is one reviewer’s experience, not a controlled battery comparison.
Are the new health and training features useful?
The readiness score is designed to help users interpret how prepared they may be for activity. McGuire reports that it draws on overnight vitals, sleep score, recent physical activity and training load. In her account, users need seven nights of wear, with at least four hours of sleep each night, before the feature can establish a baseline.
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![Apple Watch Ultra 2 [GPS + Cellular, 49mm] - Titanium Case With White Ocean Band, One Size (Renewed)](https://m.media-amazon.com/images/I/41gGnPrmuQL._SL160_.jpg)
- WHY APPLE WATCH ULTRA 2 — Rugged, capable, and built to meet the demands of endurance athletes, outdoor adventurers, and water sport enthusiasts — with a specialized band for each. The S9 SiP enables a superbright display and a magical new way to quickly and easily interact with your Apple Watch without touching the display. Up to 36 hours of battery life and 72 hours in Low Power Mode.
- CARBON NEUTRAL — Apple Watch Ultra 2 paired with the latest Alpine Loop or Trail Loop is carbon neutral. Learn more about Apple’s commitment to the environment at apple.com/2030.
- EXTREMELY RUGGED, INCREDIBLY CAPABLE — 49mm corrosion-resistant titanium case. Large Digital Crown and Customizable Action button for instant control over a variety of functions. 100m water resistance.
- BIGGEST, BRIGHTEST DISPLAY YET — Apple’s brightest Always-On Retina display is easy to see, even in direct sunlight. More room for adding complications to customize your watch face and enough space to view six metrics at once.
- THE FREEDOM OF CELLULAR — Cellular is built in. You can call and text without your iPhone, even overseas with international roaming. Stream your favorite music and podcasts. Get directions with Maps.
Her own readiness assessment was incomplete after a time-zone change disrupted sleep detection, and the review said more comparison was still planned. That makes Readiness a promising addition, but its usefulness for different people is not yet established. Treat the score as a training aid rather than a clinical measure or a definitive instruction to exercise or rest.
McGuire wore Ultra 4 for a week and ran 22 miles while comparing its heart-rate readings with a physical chest strap. She described the results in that test as “pretty much spot on,” but also found that a loose fit on her petite wrist interfered with readings. These observations do not amount to a population-level accuracy study; fit and individual use matter.
Apple describes the new sensing system and S11 as delivering “the most accurate heart rate sensing in a wearable.” That is Apple’s product-marketing claim, not an independent finding. Health feature availability varies by region and device; Apple says ECG features are intended for people aged 22 and older, and some features are for wellness rather than medical use. Check Apple’s eligibility notes before relying on a specific function.
Rank #3
![Apple Watch Ultra 3 [GPS + Cellular 49mm] Running & Multisport Smartwatch w/Rugged Titanium Case w/Black Titanium Milanese Loop - L. Satellite Communications, Advanced Health & Fitness Tracking](https://m.media-amazon.com/images/I/51x8F3QDUWL._SL160_.jpg)
- RUGGED AND READY TO GO—The ultimate sports and adventure smartwatch is built to last with an extremely tough titanium case and a strong sapphire crystal display. Water resistant up to 100m—it’s great for swimmers, divers, and fans of high-speed water sports.*
- A FULL-FEATURED HEALTH TRACKER—Ultra 3 can take an ECG* and check your heart rhythm for signs of AFib—right from your wrist. The smartwatch sends alerts for possible hypertension,* an irregular heart rhythm,* or an unusually high or low heart rate. You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and take readings of your blood oxygen.*
- ULTIMATE RUNNING AND WORKOUT COMPANION—A superior fitness tracker for marathoners, triathletes, mountain bikers, backcountry hikers, and mountain climbers, Ultra 3 provides precision dual-frequency GPS, Pacer, Heart Rate Zones, Custom Workouts, running power, Workout Buddy powered by Apple Intelligence from your nearby iPhone,* training load, and more.
- KEEP HELP CLOSE AT HAND—Ultra 3 is a smartwatch that can detect a hard fall or severe car crash* and automatically help connect you to emergency services and notify your emergency contacts. Check In can automatically notify a loved one when you’ve arrived at your destination.
- MULTIDAY BATTERY LIFE—Ultra 3 is a smartwatch that’s engineered to give you even longer battery life. It’s perfect for trail runners—with up to 42 hours of normal use and up to 72 hours in Low Power Mode.* Track a workout with full GPS and heart rate monitoring for up to 20 hours in Low Power Mode.*
Can you dive or swim with Apple Watch Ultra 4?
Apple rates Ultra 4 for water resistance to 100 meters under ISO 22810:2010 and says it is suitable for recreational scuba diving to 40 meters with a compatible third-party app. Apple says not to use it below 40 meters. The watch also has an IP6X dust-resistance rating and is described for high-speed water sports.
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A water-resistance rating does not make the watch a substitute for dive equipment, training or safety procedures. Apple warns that water resistance can diminish over time. Follow established dive protocols and consult Apple’s water-resistance guidance for the product’s limits.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What software features are available now?
Some headline audio features are announced for later rather than universally available at launch. Apple says Live Rewind and Siri Recap are expected in beta in late 2026. They require an Apple Intelligence-enabled iPhone 16 or later, excluding iPhone 16e; they begin in English and will initially be unavailable in the EU. Apple also notes that availability and usage limits may apply to Audio Intelligence features.
Rank #4
- WHY APPLE WATCH ULTRA - Rugged and capable, built to meet the demands of endurance athletes, outdoor adventurers, and water sports enthusiasts - with a specialized band for each. Up to 36 hours of battery life, plus all the Apple Watch features that help you stay healthy, safe, and connected.
- EXTREMELY RUGGED, INCREDIBLY CAPABLE - 49mm corrosion-resistant titanium case. Larger Digital Crown and more accessible buttons. 100m water resistance. Customizable Action button for instant physical control over a variety of functions.
- BIGGEST, BRIGHTEST DISPLAY YET- A bright Always-On Retina display that’s easy to see, even in direct sunlight. More room for adding complications to customize your watch face.
- FOR ENDURANCE ATHLETES - Advanced metrics in the Workout app, including Heart Rate Zones and Running Form. Precision dual-frequency GPS for accuracy, distance, route, and pace calculations. Trail Loop band is thin, light, and flexible, designed especially for runners.
- FOR OUTDOOR ADVENTURERS - Redesigned Compass app delivers all-new views and functionality. Mark your location with Compass Waypoints. Backtrack uses GPS to map where you’ve been so you can retrace your steps. Alpine Loop band is extremely rugged and secure to meet the needs of hikers and climbers.
Check Apple’s feature availability information for current timing and regional restrictions before buying for these functions. Apple also says satellite Emergency SOS, Find My and Messages are included free for two years with activation of Ultra 3 or later. Satellite Find My and Messages require a carrier plan; connection and response times vary, and availability and terms can depend on region.
Should you upgrade from Ultra 3?
For most Ultra 3 owners, the evidence points to a modest, not essential, upgrade. Tom’s Guide describes the physical design as much like Ultra 3 and identifies heart-rate sensing and recovery information as the main changes. McGuire was unsure Ultra 3 owners should upgrade; she found the watch more compelling for people with older Ultra models, those seeking longer battery life, or those interested in Audio Intelligence.
TechRadar also characterizes Ultra 4 as an evolution rather than a reinvention and says more time is needed to assess Readiness. Neither early review establishes a comprehensive controlled comparison with competing endurance watches.
Quick Recap
- Consider it if you are buying your first Ultra, replacing an older model, or expect to benefit from the newer health and training features.
- Think carefully if you already own Ultra 3 and mainly want a visible redesign or a proven improvement in readiness insights.
- Judge the battery claim by the mode you will actually use: the 45-hour maximum requires meaningful feature trade-offs.
Sources
- Apple, Apple Watch Ultra 4 product page.
- Apple, Apple Watch Ultra 4 technical specifications.
- Jane McGuire, Tom’s Guide, review published September 17, 2026.
- TechRadar, early assessment of Apple Watch Ultra 4.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
