Apple Watch Series 12 introduces a dedicated Health Sensing System and custom S11 silicon, delivering the most accurate heart rate sensing in a wearable device alongside high-frequency heart rate variability and an all-new readiness score, according to Apple product marketing vice president Kaiann Drance.
Health Sensing System Delivers High-Frequency Metrics
The newly re-architected Apple Watch Series 12 utilizes larger, power-efficient green LEDs on its optical heart sensor to measure heart rate every five seconds throughout the day. According to Apple, this continuous passive monitoring powers enhanced fitness rings and a new real-time heart rate watch face complication.
In addition to continuous heart rate monitoring, heart rate variability (HRV)—a primary indicator of stress and recovery—is now measured up to 24 times more often. The device separates HRV into recovery HRV, designed to catch daily signals, and overall HRV for broader cardiovascular insights. Overnight vitals analyses recovery HRV against a personal baseline, while a daytime vitals view allows users to spot metric shifts early.
Pro Tip: Overnight vitals and recovery HRV metrics are intended for wellness purposes only and are not designed for medical use, according to company specifications.
Audio Intelligence and Privacy Protection
Powered by the S11 chip, Apple Intelligence models on the iPhone, and Private Cloud Compute, Apple Watch Series 12 introduces advanced Audio Intelligence tools designed to keep users present in conversations. These capabilities include Sound Recognition to alert deaf or hard-of-hearing users to alarms, sirens, and crying babies; Live Rewind, which provides a 15-second text snippet of a recent conversation upon a double press of the Digital Crown; Siri Recap, which automatically generates high-level conversation summaries; and faster Shazam song recognition.
Privacy remains central to the architecture. According to Apple, the S11 chip includes a hardware-isolated Secure Exclave that processes raw audio completely isolated from the operating system and apps, deleting the data immediately. Furthermore, Audio Intelligence features do not store audio recordings, attribute speakers, or capture sensitive financial and government-assigned data.
Redesigned Health App and Longevity Insights
A redesigned Health app arriving later this year leverages Apple Intelligence to introduce a dynamic Insights tab and a Longevity tab. The Longevity tab houses a Health Age feature that tracks a user’s metrics relative to their actual age. Additionally, the app features movement evaluations measuring flexibility, strength, and balance through vision-based AI models on the iPhone alongside watch data. Users can also schedule and purchase over 50 key biomarker lab tests for $119 directly through the app at approximately 2,000 Quest Diagnostics locations across the United States.
Battery Life, Durability, and Pricing
Apple Watch Series 12 maintains up to 24 hours of everyday battery life while boosting outdoor workout battery performance to 10 hours—a 25 percent increase over previous models, based on Apple testing. Fast charging allows a 15-minute charge to deliver up to 12 hours of additional battery life. The aluminum models now feature Ceramic Shield 2, which Apple states is 60 percent tougher than the Ion-X glass used on previous generations.
The device is available in 42mm and 46mm sizes starting at $399 in the U.S. Aluminum finishes include dark bronze, black, light gold, and space gray, while titanium options feature radiant gold and natural titanium. A ceramic version is also offered in pearl white and night blue. Pre-orders begin today, with in-store availability scheduled for Friday, September 18.
Frequently Asked Questions
When will Apple Watch Series 12 be available for purchase?
Pre-orders begin today in Australia, Canada, France, Germany, India, Japan, the UAE, the UK, the U.S., and over 50 other countries and regions, with in-store availability starting on Friday, September 18.
What is the starting price for Apple Watch Series 12?
Apple Watch Series 12 starts at $399 in the United States.
Do the new Audio Intelligence features store audio recordings?
No. According to Apple, Audio Intelligence features do not create or store audio recordings, and raw audio is processed within a hardware-isolated Secure Exclave before being immediately deleted.
What operating system does Apple Watch Series 12 run?
Apple Watch Series 12 runs watchOS 27, which introduces Siri AI, a dynamic app grid, and single-handed tap gestures.
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