ClearFitness

ClearFitness turns your Apple Watch and Health data into one clear number: your Cardio Age — an auditable blend of VO₂ Max, resting heart rate, and HRV.

Tap any score to see the exact math and peer-reviewed sources behind it. No opaque ratings.

Every Sunday, an on-device AI writes a plain-English recap of your workouts, sleep, and heart trends.

• 100% on-device — nothing uploaded, no account
• One purchase. No subscriptions, no ads.