Apple Watch Series 12 Launch: New Health Sensors, Readiness Score, S11 Chip and More
Apple Watch Series 12 is Apple's new generation of health sensors, with the S11 chip, new heart rate monitoring capabilities and a new readiness feature.
According to the company, Series 12 is optimized to deliver more in-depth health and fitness data, as well as to bring new features of Apple Intelligence to the series.
New Health Sensing System
Apple Watch Series 12's heart is Apple's latest Health Sensing System.
The system is a mixture of new optical and electrical heart sensors and the S11 chip.
According to Apple, Apple Watch Series 12 is Apple's most precise wearable with heart-rate sensing.
With the larger green LEDs in its optical heart sensor, the watch can take readings of your heart rate every five seconds during the day—when you need them—and consume less power.
More Frequent HRV Measurements
An important area of interest is heart rate variability (HRV).
The Apple Watch Series 12 can measure HRV 24 times more often than previously.
To facilitate users' understanding of their daily recovery and health trends, Apple has divided HRV into recovery HRV and overall HRV measurements.
Overnight vital can be compared to a user's personal baseline to determine recovery HRV.
There is also a new daytime vitals view with additional information during the day.
New Readiness Score
The Readiness feature is new to Apple Watch Series 12.
Readiness incorporates information like recent activity, training load, vitals and sleep data.
Generates a score of 0-10 and suggestions including:
- Recover
- Pace Yourself
- Ready
- Go For It
The score may be updated throughout the day as new information is received.
This may be especially helpful for individuals who engage in a lot of physical activity or a structured workout routine.
S11 Chip
Apple Watch Series 12 is powered by Apple's S11 chip.
The new features will be available on the processor, which also powers Apple's new Audio Intelligence features.
The S11 chip's other benefits include better step-tracking and other watchOS capabilities.
Improved Battery Life During Workouts
Apple Watch Series 12 keeps its 24-hour everyday battery life.
At the outdoor workout, the watch can have up to 10 hours of battery life, which is 25% more than the previous model, Apple says. Battery life will vary depending on the activity.
Charging has been enhanced too.
Up to 12 hours of extra battery life is possible with just 15 minutes of charging, says Apple.
More Accurate Step Tracking
The pedometer model has been redesigned by Apple with new algorithms based on machine learning.
The system is designed to enhance distance coverage when walking and running indoors.
The S11 chip also enhances step count accuracy.
On the other hand, Apple is adding a new complication for steps, which allows users to view their steps directly on the watch face.
Apple Intelligence Features
The new AI features will also be added to Apple Watch Series 12 with watchOS 27.
One of the features is Sound Recognition, which could notify the user of an alarm, a siren, a door bell or a baby crying.
Another function, called Live Rewind, can show the last 15 seconds of a conversation as text.
Siri Recap is also able to summarise conversations.
These features are meant to be privacy- and security-conscious, Apple notes.
Siri AI on Apple Watch
With watchOS 27, Apple Watch Series 12 supports Siri AI.
The new Siri has improved its general world knowledge and personal context to give more relevant answers.
Another new watch face Apple is rolling out is the Siri Modular one, which will make it easier to use Siri on Apple Watch.
New Materials and Colors
Apple Watch Series 12 is available in two sizes: 42mm and 46mm.
Aluminum models include:
- Dark bronze
- Black
- Light gold
- Space gray
Titanium versions include:
- Radiant gold
- Natural titanium
Pearl white and night blue ceramic editions are also being released by Apple.
The aluminum models have Ceramic Shield 2, Apple claims which is stronger than the Ion-X glass found in previous aluminum models by 60 percent.
Price and Availability
The Apple Watch Series 12 will go for $399 in the U.S.
Pre-orders come first and will be available on the store from September 18, 2026.
The watch is also on sale in India.
Final Thoughts
Health monitoring, recovery and intelligence are key targets of Apple Watch Series 12.
It's a big health and fitness upgrade with the new Health Sensing System, more frequent HRV readings, readiness score, enhanced workout battery life and S11 chip.
Apple is also leveraging AI to add more functionality to the watch beyond fitness tracking.
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