Apple has officially introduced the Apple Watch Ultra 4, bringing a substantial set of health, fitness, battery and intelligence upgrades to its most capable smartwatch lineup. The new model is designed for athletes, outdoor enthusiasts and users who want more detailed information about their health and daily performance.
The biggest change comes from Apple’s new Health Sensing System, which combines upgraded optical and electrical heart sensors with the company’s new S11 chip. Apple says the new system provides its most accurate heart rate sensing in a wearable.
Alongside improved heart-rate monitoring, the Apple Watch Ultra 4 introduces a new Readiness score, more frequent heart rate variability (HRV) measurements, improved step tracking and longer battery life. Outdoor athletes also get a new Extended Workout mode that can provide up to 45 hours of workout tracking.
The smartwatch will be available in natural and black titanium, while a refreshed range of Trail Loop, Alpine Loop and Ocean Band options will also be offered.
Apple Watch Ultra 4: What’s New?
The Apple Watch Ultra 4 isn’t simply a cosmetic refresh. Apple has focused much of the new model’s development on improving how the watch collects, interprets and presents health and fitness information.
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Here are some of the biggest upgrades:
New Health Sensing System Takes Center Stage
Health monitoring is one of the main reasons Apple is positioning the Ultra 4 as its most advanced Apple Watch yet.
The new Health Sensing System has been redesigned around new optical and electrical heart sensors. According to Apple, the system enables the most accurate heart rate sensing in a wearable.
Apple says it tested the technology in a scientifically rigorous study involving more than 1,000 participants and compared Apple Watch’s heart-rate accuracy with leading wearable devices.
One of the most notable changes is the way the optical heart sensor operates. Larger, power-efficient green LEDs allow the Apple Watch Ultra 4 to measure heart rate every five seconds throughout the day.
That more frequent passive monitoring can provide a more detailed picture of a user’s physiological state. Apple also says the additional data should make Exercise and Move Activity measurements more accurate.
Users can also see their current heart rate more conveniently through a new heart-rate watch face complication.
HRV Monitoring Gets a Major Upgrade
Heart rate variability is another area where Apple Watch Ultra 4 gets a significant improvement.
HRV measurements can provide information about stress, recovery and overall physiological condition. With the Ultra 4, Apple says HRV can now be measured up to 24 times more frequently.
The watch also distinguishes between two HRV measurements.
Recovery HRV is intended to help identify daily changes related to stress and recovery, while overall HRV provides broader information that can be useful for understanding cardiovascular and general health trends.
Overnight vitals now incorporate recovery HRV measurements against a user’s personal baseline. Apple has also introduced a new daytime vitals view, allowing users to switch between overnight and daytime metrics.
This could make the Apple Watch more useful for people who want to identify changes in their condition before they become obvious in their overnight measurements.
Apple Watch Ultra 4 Introduces Readiness Score
One of the most interesting additions is Readiness, a new daily score designed to help users understand how prepared their body may be for the day ahead.
Rather than forcing users to interpret multiple individual metrics, Readiness combines information from:
The result is a 0–10 score accompanied by an actionable recommendation.
Depending on the data, users may see recommendations such as:
Recover, Pace Yourself, Ready, or Go For It.
The score isn’t designed only for professional athletes. Apple says it can help users decide how hard to push themselves during a normal workday, exercise session or training program.
Readiness can also change throughout the day as additional information becomes available. For example, an intense workout or a change in daytime vitals can influence the score.
Apple says the scoring system was developed using data from the Apple Heart and Movement Study, along with collaboration from exercise scientists and physicians.
For people who already track sleep, workouts and recovery, this could become one of the most useful additions to the Apple Watch Ultra experience.
Apple Watch Ultra 4 Battery Life Reaches 50 Hours
Battery life has traditionally been one of the biggest differentiators between the Apple Watch Ultra and standard Apple Watch models. Apple is pushing that advantage further with the Ultra 4.
The new smartwatch offers up to 50 hours of battery life for everyday use.
Users who enable Low Power Mode can get up to 84 hours of battery life.
Apple has also improved charging speeds. The company says just 15 minutes of charging can provide up to 18 additional hours of battery life.
For outdoor athletes, the improvements are even more significant.
The new Extended Workout mode can provide up to 25 hours of outdoor workout tracking while maintaining full GPS and heart-rate readings. Apple describes this as a 25 percent increase over the previous model.
For extremely long activities, Max Extended Workout mode can track outdoor runs, walks and hikes for up to 45 hours, while continuing to take GPS readings every second.
That makes the Ultra 4 particularly interesting for ultramarathon runners, long-distance hikers and endurance athletes who may spend an entire day or more away from a charger.
More Accurate Step Tracking
Apple is also making changes to one of the most basic functions of a smartwatch: counting steps.
The pedometer system has been redesigned using new machine-learning algorithms and the S11 chip.
Apple says this allows the Ultra 4 to provide more accurate step counts throughout the day and better distance measurements during indoor walking and running workouts.
The company describes the result as the most accurate step tracking of any smartwatch.
A new Steps complication also lets users see their current step count directly from the watch face without opening a separate app.
For everyday users, this may seem like a relatively small change, but more accurate step and distance data can make long-term fitness tracking more useful.
Redesigned Health App Coming to iPhone
Apple Watch Ultra 4’s health features will also benefit from a redesigned Health app on iPhone.
Apple plans to introduce the updated Health app later this year, with a new Insights tab intended to surface timely information based on a user’s health data.
There’s also a new Longevity tab that looks at longer-term health trends.
One of the features included in the Longevity section is Health Age. It is designed to show how certain health metrics are tracking in relation to a user’s actual age.
The Health app will also introduce movement evaluations that can measure areas such as flexibility, strength and balance using vision-based AI models on iPhone combined with heart-rate information from Apple Watch.
Apple is also adding access to new lab services in the U.S., where users will be able to schedule and purchase testing covering more than 50 key biomarkers through the Health app.
The redesigned Health app is expected to arrive later this year, initially in U.S. English.
Audio Intelligence Comes to Apple Watch Ultra 4
Apple is expanding its Apple Intelligence strategy to the Apple Watch with a collection of features called Audio Intelligence.
The company says these features are designed to help users stay aware of important sounds, remember parts of conversations and remain more engaged in everyday situations.
The features use the Apple Watch’s built-in microphone, the S11 chip, Apple Intelligence models on iPhone and Private Cloud Compute.
Sound Recognition
Sound Recognition is designed to alert users to important sounds, including:
The feature can work even when the iPhone isn’t nearby, making it particularly useful for people who are deaf or hard of hearing.
Live Rewind
Live Rewind is designed to help users remember something that was just said.
A double press of the Digital Crown can show the previous 15 seconds of a conversation as a text snippet. Users can then use Siri to ask about the content or save it for later.
Apple says Live Rewind is designed with privacy protections, including an audible chime and a visible microphone indicator when it is activated.
Siri Recap
Siri Recap can generate high-level summaries of conversations that users can review later.
Instead of producing a full transcript, the feature creates a title and key points designed to help users remember what was discussed.
Apple says the feature is designed to avoid identifying individual speakers and to exclude certain sensitive information.
Both Siri Recap and Live Rewind are expected to arrive in beta later this year.
Siri AI Gets Smarter With watchOS 27
Apple Watch Ultra 4 will run watchOS 27, which brings Apple’s next-generation Siri experience to the wrist.
The new Siri is powered by Apple Intelligence and is designed to understand personal context while also providing access to broader world knowledge.
Apple is also introducing a dedicated Siri app that allows users to continue conversations and access Apple Intelligence features.
A new Siri Modular watch face makes it easier to access Siri throughout the day.
Siri AI will initially roll out as a beta with watchOS 27, with additional language support arriving later.
watchOS 27 Adds More Features
Beyond health and AI improvements, watchOS 27 introduces several usability changes.
The app grid gets a dynamic design featuring five Siri-suggested apps based on applications that a user frequently uses or has recently opened.
Apple is also introducing a new single-handed tap gesture.
Users can tap their index finger and thumb to interact with widgets in the Smart Stack. The existing double-tap gesture can be used to scroll, while a single tap can select a widget.
Smart Stack suggestions are also becoming more context-aware. For example, the watch may suggest a Parked Car feature from Maps or a birthday-related message at an appropriate time.
Apple is also expanding Cycle Tracking support for perimenopause and menopause.
Workout Buddy gets additional improvements as well. On supported configurations, it can work on Apple Watch without an iPhone nearby and use more fitness information when providing motivational feedback.
Apple Watch Ultra 4 Design and Bands
Apple is keeping the rugged titanium construction that has become synonymous with the Ultra lineup.
The Apple Watch Ultra 4 will be available in two finishes:
Apple is also refreshing its adventure-focused bands.
The Trail Loop will be available in dark umber, sand and burgundy.
The Alpine Loop comes in desert, dark olive and burgundy.
Meanwhile, Ocean Bands are now made using a unique translucent silicone design and are available in translucent gray, translucent kelp and translucent black.
For users looking for a more premium option, the Apple Watch Hermès Ultra 4 is also part of the new lineup in natural titanium.
Hermès introduces a new Grand H titanium band featuring an extension mechanism designed to make it easier to adjust over a wetsuit.
The Hermès Ultra 4 also gets a new Fathom and Wonder watch face inspired by the ocean.
Apple Watch Ultra 4 and the Environment
Apple says environmental considerations were incorporated into the production of the new smartwatch.
The Apple Watch Ultra 4 contains 45 percent recycled material overall.
According to Apple, the 3D-printed titanium case uses 100 percent recycled titanium, while the battery uses 100 percent recycled cobalt.
Apple also says electricity used to manufacture the device comes from renewable sources across its supply chain.
The company continues to work toward its goal of becoming carbon neutral across its entire footprint by 2030.
The product’s paper packaging is also fiber-based and designed to be recyclable at home.
Apple Watch Ultra 4 Price and Availability
The Apple Watch Ultra 4 starts at $799 in the United States.
Pre-orders are available starting September 10, while the smartwatch will begin arriving in stores and becoming available to customers on Friday, September 18.
Apple Watch Ultra 4 will be available across a wide range of markets, including:
Apple is also offering new bands separately through its online store and Apple Store app.
For new customers purchasing the Apple Watch Ultra 4, Apple says certain markets may also offer promotional access to Apple Fitness+ and Apple Music.
Apple Watch Ultra 4 Specifications and Features at a Glance
| Feature | Apple Watch Ultra 4 |
|---|---|
| Processor | S11 chip |
| Health System | New Health Sensing System |
| Heart Rate | Higher-accuracy continuous monitoring |
| HRV | Up to 24x more frequent measurements |
| Readiness | 0–10 daily score |
| Normal Battery | Up to 50 hours |
| Low Power Mode | Up to 84 hours |
| Extended Workout | Up to 25 hours |
| Max Extended Workout | Up to 45 hours |
| GPS | Improved on-device GPS |
| Step Tracking | Redesigned ML-based system |
| Case Material | Titanium |
| Finishes | Natural titanium, black titanium |
| Starting Price | $799 |
| Store Availability | September 18 |
| Operating System | watchOS 27 |
Is Apple Watch Ultra 4 a Major Upgrade?
Based on Apple’s announced features, the Ultra 4 is a significant upgrade for users who care about health monitoring, endurance training and battery life.
The biggest practical improvement could be the combination of more frequent heart-rate and HRV measurements with the new Readiness score. Instead of simply collecting health information, the watch is increasingly designed to interpret that information and turn it into actionable guidance.
Battery life is another major advantage. Getting up to 50 hours under normal use and up to 45 hours for certain outdoor workouts makes the Ultra 4 better suited to long adventures.
The new S11 chip also gives Apple a foundation for more advanced intelligence features, including Audio Intelligence and the updated Siri experience.
For existing Apple Watch Ultra owners, the decision to upgrade will depend largely on how valuable these health, battery and AI improvements are. For users coming from an older Apple Watch, however, the combination of hardware and software upgrades makes the Ultra 4 a considerably more capable package.
Apple Watch Ultra 4 FAQs
What is the starting price of Apple Watch Ultra 4?
Apple Watch Ultra 4 starts at $799 in the U.S.
When will Apple Watch Ultra 4 be available?
Apple Watch Ultra 4 will be available in stores beginning Friday, September 18. Pre-orders begin September 10.
How long does the Apple Watch Ultra 4 battery last?
Apple says the Ultra 4 provides up to 50 hours of everyday battery life, or up to 84 hours in Low Power Mode.
How long can it track outdoor workouts?
Extended Workout mode provides up to 25 hours of outdoor workout tracking, while Max Extended Workout mode can provide up to 45 hours for supported outdoor activities.
What is the Readiness score?
Readiness is a new 0–10 daily score that analyzes factors such as recent activity, training load, vitals and sleep to provide guidance on how ready a user may be for the day.
What chip does Apple Watch Ultra 4 use?
Apple Watch Ultra 4 is powered by the new S11 chip.
What finishes are available?
The Apple Watch Ultra 4 comes in natural titanium and black titanium.
When is watchOS 27 available?
Apple says watchOS 27 will be available from September 14 for compatible Apple Watch models.
Final Take
The Apple Watch Ultra 4 represents Apple’s most ambitious attempt yet to turn its rugged smartwatch into a comprehensive health, fitness and adventure companion.
The new Health Sensing System, more frequent HRV measurements and Readiness score put greater emphasis on understanding the user’s physiological state. At the same time, the 50-hour battery, 45-hour outdoor workout capability and improved step tracking make it more attractive to endurance athletes and outdoor users.
Apple is also pushing further into AI. Audio Intelligence, smarter Siri and contextual Smart Stack suggestions show that the Apple Watch is becoming less about simply displaying notifications and more about proactively helping users throughout the day.
Starting at $799, the Ultra 4 remains a premium smartwatch, but its combination of health technology, battery endurance, rugged design and intelligent software makes it one of the most feature-packed Apple Watch models yet.
For The Time City, the most interesting part of the Ultra 4 story is not any single specification. It is how Apple is bringing health sensing, recovery insights, long-distance fitness tracking and AI together on a device designed to stay on your wrist all day.
