Apple Watch Series 12 and Ultra 4 launch with new health sensors and AI audio features
Apple's new Watch Series 12 and Ultra 4, launching September 18, feature a redesigned health sensing system that takes heart rate readings every five seconds — 60 times more often than the previous generation, per AppleInsider. The watches also introduce Audio Intelligence, including Live Rewind and Siri Recap, which can transcribe and summarize conversations, though these features require an iPhone 16 or newer and arrive later in 2026.
Bottom line — Apple claims the Series 12 has the most accurate heart rate sensing in a wearable, based on a study of over 1,000 participants.
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- The new Readiness app scores users 0–10 based on activity, vitals, and sleep, with categories from 'Recover' to 'Go For It,' according to 9to5Mac.
- Apple says the Ultra 4 offers up to 50 hours of normal battery life and 84 hours in Low Power Mode, per TechRepublic.
- The Ultra 4 starts at €730 ($799) and the Series 12 at €365 ($399), with Amazon already offering pre-order discounts of up to €18 ($20), per MacRumors.
- Apple's study compared the Series 12 against Garmin, Google, Samsung, Whoop, Huawei, and Oura devices, using a Polar H10 chest strap as a reference, Runner's World reported.
- The Ultra 4 drops GLONASS satellite support but adds dual-frequency GPS, which Apple says is 'the most accurate on-device GPS in a sports watch,' per AppleInsider.
- Audio Intelligence features like Live Rewind capture the last 15 seconds of audio as text, with Apple stressing no audio files are stored, Mashable noted.