Know your VO2max.
Of everything you can measure about your fitness, VO2max is the number most consistently linked to a longer life. OxyScore measures it properly, tells you what it means, and trains it up.
Not on the App Store yet the download link lands here on launch day
Measure
Your Watch reads low.
Apple's passive estimate never sees a maximal effort and runs about six points under a lab test. OxyScore's guided field tests — Cooper, Rockport, and an indoor max-effort protocol — measure your real number and chart it against every passive estimate, so you can see the gap for yourself.
Train
Your week, planned for you.
One adaptive weekly goal — hard sessions and easy Zone 2 minutes sized to your fitness, stepping up when you're ready and backing off when you're not. Written in plain sentences by Apple Intelligence on supported iPhones, from your own numbers.
Understand
See what training does.
Your fitness age today — and where published training studies say eight weeks and a year of work could take it. Population research, clearly labelled, never a personal prediction.
Keep going
Streaks. Levels. Monthly reports.
Weekly streaks with earned grace weeks, a training level that only real work moves, research-grounded achievements, and a longevity report at the end of every month.
Coached on your wrist
Every protocol runs on Apple Watch with haptic cues — push, ease off, done. No screen-watching mid-interval.
Your health data never leaves your device
OxyScore reads from Apple Health and does all of its computation on your iPhone and Apple Watch. Your VO2max, heart data and profile are never uploaded, sold, or shared — there is no account and no OxyScore server. Your streak and weekly goals sync through your own private iCloud so a new phone doesn’t reset them; health data never does. Read the privacy policy →