Apple Watch Series 12 Adds 0-10 Readiness Score as New HR Sensor Drives Upgrade
Updated
Updated · DC Rainmaker · Oct 2
Apple Watch Series 12 Adds 0-10 Readiness Score as New HR Sensor Drives Upgrade
3 articles · Updated · DC Rainmaker · Oct 2
Summary
Series 12’s biggest change is software locked to a new optical heart-rate sensor, bringing a 0-10 Readiness Score, expanded HRV tracking and updated Vitals features unavailable on older Apple Watches.
Seven nights of sleep data are needed to generate the score, which updates through the day based on workouts, sleep and vitals; the reviewer found the logic broadly sensible but said null readings and daytime HRV remain confusing.
Heart-rate performance was judged very strong overall, but Apple’s workout sampling can leave gaps of 8 to 20 seconds, undercutting the company’s claim of the most accurate wearable heart-rate sensing.
Battery life settled at roughly 1 to 1.5 days after an uneven first week, with 5 minutes of charging delivering about 10 hours of sleep tracking and 80% reached in 30 minutes.
The review says the watch is a compelling upgrade mainly for users on Series 9 or older, while Series 10 and 11 owners may gain less despite improved health features.