Apple Watch Ultra 4 adds a new health and readiness feature set and an S11 chip, while keeping the Ultra 3’s 49 mm titanium format, display specifications and 64 GB storage. Choose Ultra 4 if its readiness and heart-rate features matter to you; consider Ultra 3 if its current price is substantially lower and its documented features meet your needs. This comparison is based on Apple’s published specifications and claims, not independent head-to-head testing.
What’s different between Apple Watch Ultra 4 and Ultra 3?
The main documented changes are the chip and health-related features. Apple lists the S11 chip in Ultra 4, compared with the S10 in Ultra 3. Ultra 4 also adds a Health Sensing System, a readiness app, recovery HRV and high-frequency background heart-rate tracking. Apple’s Ultra 3 specifications list electrical and third-generation optical heart sensors, but do not list Ultra 4’s readiness app.
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| Specification | Apple Watch Ultra 3 | Apple Watch Ultra 4 |
|---|---|---|
| Case | 49 mm Grade 5 titanium; natural and black finishes | 49 mm Grade 5 titanium; natural and black finishes |
| Display | 422 × 514 pixels; 1,245 sq mm; up to 3,000 nits | 422 × 514 pixels; 1,245 sq mm; up to 3,000 nits |
| Chip | S10 | S11 |
| Storage | 64 GB | 64 GB |
| Health and readiness features listed | Electrical and third-generation optical heart sensors; standard listed health suite | Health Sensing System, readiness app, recovery HRV and high-frequency background heart-rate tracking |
The listed case and display specifications do not establish a size or display upgrade. The chip change alone is not evidence of a particular speed or battery-life improvement in everyday use.
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Apple’s Ultra 4 product page claims up to 50 hours of normal-use battery life. Its 2026 launch announcement separately claims up to 45 hours of outdoor workout tracking, described as Max Extended Workout tracking. These figures refer to different use cases and are manufacturer claims, not independent measurements. The Ultra 3 specification excerpt available for this comparison does not establish a directly comparable battery figure, so these figures do not prove that Ultra 4 lasts longer than Ultra 3 in a like-for-like test.
#1 Best Overall
![Apple Watch Ultra 3 [GPS + Cellular 49mm] Running & Multisport Smartwatch w/Rugged Titanium Case w/Blue/Bright Blue Trail Loop - M/L. Satellite Communications, Advanced Health & Fitness Tracking](https://m.media-amazon.com/images/I/51SKumOyv8L._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.*
How much do the watches cost?
Apple’s checked U.S. pages list Apple Watch Ultra 4 from $799. A current Ultra 3 price was not established in the sources checked on October 9, 2026, so there is no reliable price gap to quote here. Prices and availability can vary by region, seller, condition, finish and band; compare the exact listings available to you before deciding.
Which Apple Watch Ultra should you buy?
Choose Ultra 4 if its new health and readiness features matter to you
Ultra 4 is the more straightforward choice if you expect to use the readiness app, recovery HRV or high-frequency background heart-rate tracking and its price fits your budget. The published feature list establishes what Apple says the watch includes; it does not establish diagnostic benefits or better health outcomes.
Rank #2
![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.*
Choose Ultra 3 if it costs substantially less and meets your needs
If you are satisfied with Ultra 3’s existing features, a meaningful price saving may make the older model the better fit. Check that the particular listing is for the 49 mm Ultra 3 you want, and account for its condition and included band when comparing it with Ultra 4.
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Keep your current Ultra if the differences would not change your use
The specifications presented here do not show a case-size, display-resolution or storage increase. If you do not need Ultra 4’s added health and readiness functions, the documented differences alone may not justify replacing a watch that already serves you well.
Rank #3
![Apple Watch Ultra 3 [GPS + Cellular 49mm] Running & Multisport Smartwatch w/Rugged Titanium Case w/Anchor Blue Ocean Band. Satellite Communications, Advanced Health & Fitness Tracking](https://m.media-amazon.com/images/I/410UsX8rgRL._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.*
What Apple’s heart-rate claims do—and do not—establish
Apple’s September 9, 2026 launch release describes a study with more than 1,000 participants as scientifically rigorous. The cited announcement excerpt does not provide the study publication or enough methodological detail to independently assess it. Apple executive Kaiann Drance also called Ultra 4’s heart-rate sensing “the most accurate” in a product-marketing statement; that superlative is Apple’s claim, not an independently verified Ultra 4-versus-Ultra 3 result.
Quick Recap
Rank #4
![Apple Watch Ultra 3 [GPS + Cellular, 49mm] Black Titanium Case with Black Ocean Band (Renewed)](https://m.media-amazon.com/images/I/41pgd6Mf8nL._SL160_.jpg)
- Snowboarding, skiing, mountain biking, rowing, and more — you’ll find tons of additional ways to take your favorite sports and activities to the next level with Ultra 3 in the App Store. Tap in. Max out.
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