Apple has launched a new Readiness app exclusively for Apple Watch Series 12 and Apple Watch Ultra 4, leveraging the upgraded Health Sensing System with redesigned optical and electrical sensors. The app generates a daily score from 0–10 across four classifications: Recover (0–1), Pace Yourself (2–4), Ready (5–7), and Go For It (8–10). The score integrates activity data, daytime and overnight vitals from the Vitals app, and sleep history.

Increased activity lowers the score, while steady activity raises it; favorable vitals and high heart rate variability boost readiness, and sleep quality directly impacts the rating. The app includes complications and Smart Stack widgets for glanceable insights, with deeper details in the Fitness app on iPhone. Pre-orders start at $399 for Series 12 and $799 for Ultra 4, with both models launching September 18.

The feature is not available on Series 11, Ultra 3, SE 3, or earlier models, even with watchOS 27.