Apple Watch Series 12 Boosts Health Tracking 60-Fold as 2 Audio Features Remain Unavailable
Updated
Updated · Engadget · Sep 17
Apple Watch Series 12 Boosts Health Tracking 60-Fold as 2 Audio Features Remain Unavailable
3 articles · Updated · Engadget · Sep 17
Summary
Heart-rate background sampling jumps to every five seconds from every five minutes on Series 12, with the review calling the redesigned health sensing system its most meaningful upgrade.
The new sensor array also records HRV as often as every five minutes and adds RMSSD readings, while the watch’s numbers generally stayed within two beats per minute of a Fitbit Air in testing.
Three gestures — including a new one-tap input — made hands-free navigation through Smart Stack and cards noticeably more useful, one of the review’s standout day-to-day improvements.
Two headline Audio Intelligence tools, Siri Recaps and Live Rewind, still cannot be tested because they are delayed until later this year, leaving privacy concerns hanging over features not yet shipping.
Battery life roughly matched the prior model, but faster charging helped: a 12-minute top-up took the watch from 51% to 79%, supporting Apple’s pitch of a solid upgrade at the same $400 starting price.
Will Apple's aggressive fast-charging strategy for the Series 12 ultimately degrade your battery while powering its new AI features?
Could the Apple Watch Series 12's always-on ambient audio buffering unintentionally compromise the privacy of everyone in your vicinity?
Is the new AI-driven readiness score actually helping you recover, or just training you to ignore your body's natural signals?
Apple Watch Series 12: 5-Second Heart Rate Tracking, S11 AI Chip, and the End of Subscription Health Wearables
Overview
The Apple Watch Series 12, launched in September 2026, marks a major leap in wearable technology by combining the powerful S11 chip with a redesigned Health Sensing System. This new chip features a dedicated always-on processor, enabling continuous heart rate and HRV tracking while maintaining 24-hour battery life. Advanced AI features like Live Rewind and Siri Recap run securely thanks to a hardware-isolated Secure Exclave, ensuring user privacy. The Series 12 also introduces a tougher Ceramic Shield 2 display and brings back the premium ceramic finish. With dynamic health insights, real-time Readiness scores, and robust developer tools, Apple sets a new standard for smartwatches.