Apple Watch Series 12 and Apple Watch Ultra 4 add a Readiness score, a single daily number from 0 to 10 that Apple builds from recent activity, training load, vitals and sleep. Each score comes with one of four recommendations: Recover, Pace Yourself, Ready or Go For It.
Keynote coverage described a new Readiness app, and Apple’s press release fills in how the score works. It draws on the new Health Sensing System, which measures heart rate every 5 seconds and HRV every 5 minutes, and it updates during the day rather than being fixed each morning. Our Series 12 preview covers the pre-event expectations.
How the Readiness score is calculated
Apple lists four inputs: recent activity, training load, vitals and sleep. The vitals piece is where the new sensors matter, since Series 12 and Ultra 4 sample HRV 24 times more often than before and track a Recovery HRV figure aimed at daily stress and recovery.
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Apple has not published the weighting of the four inputs, how many days of history the score needs before it appears, or the thresholds that separate one recommendation from the next.
What the four recommendations mean
| Recommendation | Plain reading |
|---|---|
| Recover | The low end of the scale: rest is the priority |
| Pace Yourself | Activity is fine, but not at full effort |
| Ready | Normal training or activity |
| Go For It | The high end of the scale: a good day for a hard effort |
The plain readings above follow the labels themselves. Apple describes them only as four recommendations attached to the 0 to 10 score, so treat the score, not the label, as the number to watch over time.
Because the score updates during the day, a poor night of sleep that produces a low morning score can shift as activity and vitals change. Apple has not said how often the score refreshes.
Where you see it
- On Series 12 and Ultra 4, alongside the new Steps complication and the daytime vitals view
- In the new Health app on iOS 27 and iPadOS 27, where the Insights tab includes readiness summaries next to heart, sleep, fitness, vitals and cycle tracking
- In the Health app’s For You section, which surfaces real-time summaries built with Apple Intelligence
The redesigned Health app launches in US English first, with more languages later, and some features require users 18 or over. Apple notes that the Vitals app is for wellness purposes, not medical use, and the same framing applies to Readiness.
Apple has not said whether Readiness comes to Series 11 or earlier watches through watchOS 27. The update arrives on Monday, September 14, the same day as iOS 27, and supports Series 9 and later, SE 3, and Ultra 2 and later. Series 12 at $399 and Ultra 4 at $799 reach stores on Friday, September 18, and our event recap covers the rest of the announcements.
