GoKawiilApple Watch Series 12 adds new sensor array and daily Readiness score
Apple's Series 12 smartwatch features a redesigned sensor layout with more diodes and electrodes for greater skin contact, enabling more frequent and accurate heart rate and HRV readings. This data powers a new Readiness app that generates a daily 0-10 score based on activity, sleep and vitals, alongside a redesigned Health app with Apple Intelligence summaries for compatible iPhones.