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Apple has unveiled the Apple Watch Ultra 4, the new generation of its most rugged watch designed for sport and demanding activities. The model features the S11 chip and a new Health Monitoring System that collects heart rate and heart rate variability data much more frequently. One of the most important additions is the Readiness feature, which analyses, among other things, sleep, activity and training load to determine the body’s capacity on a given day. Apple has also improved battery life, which can reach up to 50 hours in typical use. The Apple Watch Ultra 4 costs in Poland from 3799 zł, and will be available in stores on 18 September.
New health monitoring system and Readiness feature
The Apple Watch Ultra 4 features a redesigned optical and electrical sensor system that enables more frequent data collection regarding the body. Larger, more energy-efficient green LEDs allow for heart rate measurements every five seconds throughout the day. Apple states that continuous monitoring provides a more accurate assessment of the user's fitness and improves the performance of the "Exercise" and "Move" activity rings. Heart rate can also be checked directly from the watch face via a new complication. Heart Rate Variability (HRV) is also measured much more frequently; the Apple Watch Ultra 4 can collect HRV data up to 24 times more often than before, with results available in a new section of the Heart Rate app. To simplify data interpretation, the manufacturer distinguishes between recovery-related HRV and the general HRV metric. A new Vitals view allows users to compare daytime and nighttime data and track potential changes in their body. Based on this data, the watch introduces a "Readiness" feature. The system analyzes recent activity, training load, vital signs, and sleep scores to generate a rating from 0 to 10. This score is accompanied by one of four recommendations: Recover, Conserve Energy, Ready, or Go Hard. The rating can shift throughout the day as new information becomes available—for instance, following an intense workout. Apple developed the algorithm using data from the Apple Heart and Movement Study, among other sources, and in collaboration with sports physiologists and medical professionals.
Battery, S11, and new watchOS 27 features
The Apple Watch Ultra 4 offers up to 50 hours of battery life on a single charge, extending to 84 hours in Low Power Mode. Charging speeds have also been improved; a 15-minute charge can provide up to 18 hours of additional use. For outdoor workouts, the watch can operate for up to 25 hours with continuous GPS tracking and heart rate monitoring—a 25 percent increase over the previous generation. A dedicated "Max Extended Workout" mode allows for the tracking of runs, walks, and hikes for up to 45 hours; Apple states this is sufficient to cover a 160-kilometer race while recording GPS data every second. The device is powered by the new S11 chip, which also supports new sound recognition features. The Apple Watch Ultra 4 can detect sounds such as sirens, alarms, doorbells, and a baby crying, notifying the user accordingly. This feature was developed with the deaf and hard-of-hearing communities in mind. The watch also integrates with Shazam, enabling quick music recognition directly from the wrist. Apple emphasizes that sound processing takes place via the hardware-isolated Secure Exclave coprocessor, and no audio recordings are stored. Additionally, watchOS 27 introduces new gestures, widget suggestions, and updates to the Smart Stack. Users can, for instance, tap their thumb and index finger together to open a widget and utilize new context-aware suggestions. The system also supports Siri AI powered by Apple Intelligence, and the "Workout Buddy" feature can run on the watch independently of an iPhone.
The Apple Watch Ultra 4 focuses primarily on more accurate health monitoring, longer battery life and features useful during workouts. The biggest new feature is Readiness, which, based on collected data, helps assess what the user is capable of on a given day. The watch also offers up to 50 hours of regular use and even 45 hours of recording long activities in Maximum Extended Workout mode. The Apple Watch Ultra 4 starts at 3,799 zł in Poland and goes on sale on 18 September 2026.
source: apple
