Your VO2 Max, finally visible
Your Apple Watch tracks VO2 Max—one of the best predictors of longevity—but the data is buried in Health app. Get instant notifications and home screen widgets.
Simple. But it works.
Your VO2 Max is buried 5 taps deep in Apple Health. We bring it to the surface with notifications and widgets.
Instant Notifications
Get notified the moment your Apple Watch records new VO2 Max data. Never miss an update again.
Home Screen Widgets
See your latest VO2 Max right on your home screen. No app opening required—just glance and go.
Biological Age
Translate your VO2 Max into biological age. Are you aging faster or slower than your actual age?
Apple Health Sync
Connects directly to Apple Health. Your data flows in automatically from your Apple Watch.
100% Private
Your health data never leaves your device. We don't collect, store, or sell any personal information.
Science-Based
Our algorithm is based on the HUNT Fitness Study with 55,000+ participants.
How It Works
Download & Connect
Get VO2 Max Pro from the App Store. Grant access to Apple Health with one tap.
Get Notified
Receive instant notifications whenever your Apple Watch records new VO2 Max data.
Track Your Age
See your biological age and watch it improve as your cardiovascular fitness increases.
Biological Age Calculator
Enter your VO2 Max to see your biological age instantly. Same algorithm used in the app.
Biological Age Calculator
Health app → Heart → Cardio Fitness
What Users Say
“Finally an app that makes VO2 Max data meaningful. Love seeing my biological age drop as I train.”
Michael, 42
“So simple to use. It just pulls from Apple Health and shows me exactly where I stand. No fuss.”
Sarah, 38
“The peer comparison feature is incredibly motivating. I'm now in the 'High' category for my age!”
David, 55
Questions & Answers
What is VO2 Max?
VO2 Max measures how efficiently your body uses oxygen during exercise. It's considered the gold standard for cardiovascular fitness and is strongly correlated with longevity. Apple Watch estimates this automatically during outdoor walks, runs, and hikes.
How is biological age calculated?
We compare your VO2 Max to population-level data from the HUNT Fitness Study (55,000+ participants). If your VO2 Max is higher than average for your age, your biological age will be lower than your chronological age.
Do I need an Apple Watch?
Yes, you need an Apple Watch to measure VO2 Max. The watch estimates your cardio fitness during outdoor activities and stores it in Apple Health, which our app reads automatically.
Is my data private?
Absolutely. Your health data never leaves your device. We don't have servers, accounts, or any way to access your information. Everything stays on your iPhone.
How do notifications work?
When your Apple Watch records new VO2 Max data (usually after outdoor walks, runs, or hikes), you'll get an instant notification with your latest reading. No more digging through Apple Health.
Is the app free?
Yes, VO2 Max Pro is completely free. All features—notifications, widgets, biological age calculation, and trend tracking—are included at no cost.
Can I improve my biological age?
Yes! Regular cardiovascular exercise can improve your VO2 Max at any age. Studies show improvements of 10-20% with consistent training over several months.
Stop digging through Apple Health.
Get instant notifications when new VO2 Max data arrives. See your stats on your home screen. Know your biological age.
Requires iOS 17+ • Also available on Mac and Apple Vision