Apple Watch Ultra 4 was announced on September 9, 2026, and became available September 18. Its confirmed upgrades include an S11 chip, a new Health Sensing System with more frequent heart-rate and HRV readings, and a daily readiness score; it comes in natural and black titanium. Apple has not announced microLED, and pre-launch design reports conflicted.
Here is what Apple confirmed, what the earlier rumors got right or wrong, and what to know about Ultra 4’s health features. Apple’s performance and accuracy comparisons below are company claims, not independent test results.
What’s new on Apple Watch Ultra 4?
| Feature | What Apple confirmed |
|---|---|
| Chip | S11 chip. |
| Health sensing | New Health Sensing System, including heart-rate readings every five seconds throughout the day and HRV readings as often as every five minutes. |
| Readiness | A daily 0–10 score and recommendation based on recent activity, training load, vitals, and sleep score. |
| Finishes | Natural and black titanium. |
| Outdoor workout battery | Apple advertises up to 45 hours of outdoor workout tracking under its stated conditions. |
| MicroLED | Not announced as a display feature. |
Release date and availability
Apple announced Apple Watch Ultra 4 on September 9, 2026, and said availability began September 18. It is a released product, not an upcoming September rumor. The research used for this article does not establish current retail pricing or stock, so check Apple or a retailer for those details.
Health sensing: more frequent heart-rate and HRV readings
Apple says Ultra 4’s new Health Sensing System uses larger, power-efficient green LEDs in its optical heart sensor. Apple says the watch measures heart rate every five seconds throughout the day and can measure heart-rate variability (HRV) as often as every five minutes—up to 24 times more frequently than before.
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#1 Best Overall
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- 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.
The Heart Rate app presents two HRV variants: Recovery HRV, for day-to-day stress and recovery signals, and overall HRV, for broader health insights. The Vitals app adds recovery HRV against a personal baseline and a daytime view alongside overnight metrics.
Apple says a study of more than 1,000 participants found the new heart-rate sensing had the highest accuracy among the wearables compared. This is Apple’s description of its study; the release does not establish independent replication or a universal ranking. Treat the accuracy comparison as a company claim.
Readiness score: a training and wellness aid
Readiness is Apple’s daily score from 0 to 10, paired with one of four prompts: “Recover,” “Pace Yourself,” “Ready,” or “Go For It.” Apple says it draws on recent activity, training load, vitals, and sleep score, updates as new data arrives, and highlights factors behind the score.
Apple says the scoring algorithm was developed using data from the Apple Heart and Movement Study in collaboration with exercise scientists and physicians at Apple. Readiness is a training and wellness aid, not a diagnosis. Apple says the Vitals app is for wellness purposes only, not medical use.
Rank #2
![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.
Design: what happened to the redesign rumors?
Pre-launch design reporting conflicted. A May 2026 report relayed supply-chain claims of a “full redesign,” including a possible eight-sensor arrangement on the back. On August 30, a report summarizing Mark Gurman’s expectations said Ultra 4 would have no major design changes versus Ultra 3.
Apple’s announcement confirms natural and black titanium finishes and the product’s features, but the available materials do not provide a comparative enclosure redesign specification. The early full-redesign claim was not established as fact. It is safest to describe the rumors as conflicting rather than claim either a major redesign or exact exterior continuity.
Battery life and GPS: Apple’s stated claims
Apple advertises up to 45 hours of outdoor workout tracking and calls Ultra 4’s on-device GPS the most accurate in a sports watch. These are manufacturer claims under stated conditions, not independently tested results. The research used here does not provide independent Ultra 4 battery or GPS testing.
Will Apple Watch Ultra 4 have microLED?
Apple did not announce microLED as an Ultra 4 display feature. MacRumors’ project-history account says Apple’s earlier Apple Watch microLED project was canceled or indefinitely delayed in March 2024, following supplier developments, and that no current release plan existed in that account.
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![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.*
That history is not proof Apple will never use microLED, but it is not a promise that the technology will eventually ship. The available evidence does not support treating microLED as an Ultra 4 feature.
Should you buy Ultra 4 or keep Ultra 3?
Ultra 4’s confirmed differences include more frequent heart-rate and HRV sensing and the Readiness feature. Whether those are worth upgrading for depends on your needs; the research does not establish that an upgrade is worthwhile for every Ultra 3 owner. Consider the features you will use rather than relying on pre-launch redesign or microLED speculation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
Is Apple Watch Ultra 4 officially available?
Apple announced it on September 9, 2026, and said availability began September 18.
What health features did Apple add to Ultra 4?
Apple confirmed a new Health Sensing System with heart-rate readings every five seconds throughout the day and HRV readings as often as every five minutes. It also added a daily Readiness score based on activity, training load, vitals, and sleep score.
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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.
Does Apple Watch Ultra 4 measure blood pressure?
The confirmed features in the research dossier do not include direct blood-pressure measurement. Do not confuse earlier blood-pressure-related rumors with a confirmed Ultra 4 capability.
Did Ultra 4 get a major redesign?
Pre-launch reports conflicted: an early supply-chain report suggested a full redesign, while later reporting expected no major design changes. Apple confirmed natural and black titanium finishes but the materials reviewed here do not specify a comparative enclosure redesign.
Does Apple Watch Ultra 4 have a microLED display?
Apple did not announce microLED for Ultra 4. A project-history account reported that Apple’s earlier watch microLED project was canceled or indefinitely delayed in 2024.
How long does Ultra 4 last during outdoor workouts?
Apple advertises up to 45 hours of outdoor workout tracking under its stated conditions. This is a manufacturer claim, not an independent test result.
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