Apple Watch Series 12 and Ultra 4 gain Readiness Score

Apple added a Readiness Score to the Apple Watch Series 12 and Ultra 4, assessing recovery from heart rate, HRV, sleep, temperature and stress. It uses a 1–10 scale, takes seven days to calibrate and updates throughout the day.

• Readiness Score runs on the S11 chip and Health Sensing System
• Uses a 1–10 scale instead of 1–100 like rivals
• Calibration takes 7 days with consistent sleep tracking
• Score updates throughout the day, not just in the morning