The Apple Watch Ultra 4 arrives three years after the Ultra 2. Across those two generations, Apple added satellite connectivity, a larger display, new health sensors, and longer battery life. Are those changes enough to justify replacing an Ultra 2 or paying more for the newest model? Both watches retain a 49mm titanium case, an Action button, a siren, a 3,000-nit display, dual-frequency GPS, and support for recreational diving to 40 meters. The Apple Watch Ultra 4 starts at $799 in the U.S. Apple has discontinued the Ultra 2, although its refurbished store currently lists it from $589. Here are the key differences between the two models: Apple Watch Ultra 2 Apple Watch Ultra 4
Audio Intelligence: Sound Recognition, automatic music identification, Live Rewind, and Siri Recap
Up to 17 hours of outdoor workout tracking in Low Power Mode with full GPS and heart-rate readings
Up to 25 hours in Extended Workout mode with full GPS and heart-rate readings
Up to 35 hours of outdoor workout tracking with fewer GPS and heart-rate readings
Up to 45 hours in Max Extended Workout mode, with GPS readings every second
Most Apple Watch Ultra 2 owners should keep their watch if its battery still covers their usual days and workouts. It supports watchOS 27 and Siri AI, and continues to get new features through software updates. The new Health Sensing System is the strongest reason to upgrade an Ultra 4. It measures heart rate every five seconds throughout the day and collects HRV data more frequently, enabling Recovery HRV, daytime Vitals, and the Readiness app.
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