What Are the Design and Hardware Changes in Apple Watch Ultra 4?
The Apple Watch Ultra 4 keeps the titanium case construction but introduces a slightly wider yet slimmer profile, measuring 49 x 44 x 12mm compared to the Ultra 3's 49 x 41 x 14mm. The weight has increased a little, from 61.6g to 63.1g. These subtle modifications enhance wearability without a drastic change in appearance. Notably, the battery life extends to 48 hours from Ultra 3's 42 hours, enabling longer endurance, particularly useful for extended outdoor activities or overnight health tracking. The display remains the same OLED Retina quality with a resolution of 514 x 422 pixels.
How Has Health Monitoring Improved with Ultra 4?
The Ultra 4 features a new Health Sensing System with a redesigned LED optical heart rate sensor, improving skin contact with a larger electrode surface area. Heart rate measurements occur more frequently—every five seconds versus longer intervals on prior models—offering enhanced accuracy. Furthermore, heart rate variability, a key rest and recovery metric, updates up to every five minutes overnight, providing granular insights into your physiology. These enhancements collectively make the Ultra 4's heart rate monitoring highly precise, rivaling medical-grade chest strap sensors.
Which New Features Does Apple Watch Ultra 4 Introduce?
The Ultra 4 introduces several features missing from previous models. A long-awaited Readiness Score assesses your overnight recovery and ongoing energy levels throughout the day, similar to metrics found on Garmin or Whoop devices. The Health Age feature compares your fitness with peers, offering motivating context for your health progress. Apple's redesigned Health app leverages AI to offer personalized insights based on your data, and it works across compatible Apple Watches and iPhones.
Exclusive Audio Intelligence features on Ultra 4 include Shazam integration on the wrist and real-time Sound Recognition alerts for events like doorbells or sirens. More controversially, Live Rewind allows your watch to capture and replay the last 15 seconds of conversation with a crown tap, and Siri Recap processes daily audio interactions to summarize your day. While these features offer convenience and novel interaction, they raise privacy considerations users should weigh carefully.
What About Price and Availability?
The Apple Watch Ultra 4 is priced identically to the Ultra 3, at $799 / £749 / AU$1,399, making it a straightforward upgrade financially. It became available for purchase starting September 18. For users deciding between the two, waiting for the Ultra 4 is advisable if you value the improved battery and health tracking capabilities alongside new software features.
Who Should Upgrade to Apple Watch Ultra 4?
Upgrade to the Ultra 4 if you prioritize longer battery life for multi-day use, enhanced heart rate accuracy for training and health monitoring, and new health metrics like Readiness Score and Health Age. The innovative Audio Intelligence features may appeal if you want deeper integration of your watch into your daily environment and communications—provided you are comfortable with the privacy implications. However, if you already own Ultra 3 and are satisfied with its features and battery life, the differences may not justify immediate upgrading.