ZoneMax: VO₂ Max Optimizer

Know your zones. Track your VO₂ Max. Score your recovery. All from your Apple Watch — one-time purchase, no subscription.

ZoneMax turns your Apple Watch workout data into clear, actionable fitness insights — no subscription, no account, no data leaving your device.

HEART RATE ZONE BREAKDOWN See exactly how much time you spend in each heart rate zone for every workout. Visualize your training intensity with an Activity Ring-style display.

VO₂ MAX TRENDS Track your cardiorespiratory fitness over time with interactive charts. See how you rank against age and sex-adjusted benchmarks.

DAILY RECOVERY SCORE A composite score built from your HRV, resting heart rate, sleep, and training load — so you know when to push hard and when to rest.

BUILT FOR PRIVACY Zero data collection. Zero analytics. Everything stays on your device.

Requires Apple Watch and HealthKit data.