# Apple Watch Series 12 starts a new wearable era > Apple's biggest smartwatch update in years brings continuous heart rate monitoring, AI health insights, and controversial ambient listening features. - Title: Apple Watch Series 12 starts a new wearable era · The Verge - Summary: Apple's biggest smartwatch update in years brings continuous heart rate monitoring, AI health insights, and controversial ambient listening features. The… - Keywords: apple watch series 12, smartwatch, wearables, health tracking, continuous heart rate monitoring, ai wearables, audio intelligence, apple, s11 chip, readiness score, siri ai, privacy - Source: The Verge — https://theverge.com/tech/996715/apple-watch-series-12-review-wearables-smartwatch - Author: Victoria Song - Published: 2026-09-17T12:00:00+00:00 - Read time: 3 min - Topics: apple watch series 12, smartwatch, wearables, health tracking, continuous heart rate monitoring, ai wearables, audio intelligence, apple, s11 chip, readiness score, siri ai, privacy ## Same look, major changes inside The Series 12 looks identical to previous Apple Watches but features a completely redesigned sensor array and new S11 chip that enable continuous health monitoring and AI features. ## Two big hardware upgrades The new S11 chip includes a secure exclave for microphone processing and faster performance. The redesigned sensor array captures health data more frequently, accurately, and efficiently. ## Truly continuous heart rate monitoring The Series 12 now measures heart rate every five seconds at rest and during activities, compared to once every five minutes before. This matches what competitors have offered for years. ## Heart rate accuracy tested In testing against a gold-standard Polar H10 chest strap, the Series 12 stayed within five beats per minute across runs, walks, and rest periods with only a slight lag. ## Faster Siri on your wrist The S11 chip makes Siri queries noticeably faster than the Ultra 3. A new pinch gesture improves one-handed control, making this the most capable wrist computer Apple has made. ## Battery life stays the same The Series 12 maintains the 24-hour battery estimate despite continuous heart rate tracking. Faster charging gets you from 20 to 64 percent in 20 minutes. ## New readiness score explained Apple's readiness score measures how recovered you are from physiological stress using sleep, activity, and overnight vitals. It takes seven nights to generate and ranges from 0 to 10. ## What readiness score tells you Scores 0 to 1 mean recover, 2 to 4 mean pace yourself, 5 to 7 mean ready, and 8 and above mean go for it. The score updates throughout the day based on naps and workouts. ## Recovery HRV is new metric Apple uses a new recovery heart rate variability formula enabled by the updated sensor array. It measures daily short-term strain, different from regular HRV which tracks overall stress. ## Audio Intelligence arrives later The S11 chip enables ambient listening features called Audio Intelligence, including Live Rewind, Siri Recap, improved Shazam, and sound recognition. Most features launch later this year. ## Live Rewind and Siri Recap Live Rewind shows a 15-second transcript of recent audio on your wrist. Siri Recap summarizes conversations from your entire day. Both features sparked privacy concerns on social media. ## Shazam is now extremely fast The improved Shazam feature identifies songs instantly through the Smart Stack. A pinch gesture brings up the widget and displays the song name in seconds. ## Sound recognition for accessibility This feature alerts deaf and hard of hearing users to urgent sounds like doorbells, alarms, and sirens. Testing showed it carefully avoids false positives from TV shows. ## Apple's privacy approach matters Audio Intelligence features are opt-in and off by default. Apple published a privacy white paper to position itself as setting a new standard for AI wearables. ## Health app getting major redesign A redesigned Health app launching later this year will include AI insights, a Health Age score, VO2 max tests using your phone camera, and the ability to order blood panels through Quest Diagnostics for 119 dollars. ## Who should upgrade Series 6 or earlier owners should upgrade. Series 7 and 8 users should weigh AI features against battery life. Series 9 and later only need to upgrade for continuous heart rate monitoring if they have chronic illness. ## This is just the beginning The Series 12 is an incomplete review because key features launch later. The hardware foundation suggests Apple has ambitious plans beyond health tracking for the watch. > I'll be back to test everything once it's all available, but even now you can see where Apple is heading. ## Key takeaway The Series 12 is a foundational hardware upgrade that enables ambitious AI health features coming later this year, positioning Apple to lead the emerging AI wearables market.