True VO2 Max — Cardio Fitness

True VO2 Max gives you lab-like cardio fitness insights using your Apple Watch. No more misleading VO₂ max drops due to heat, humidity, altitude or smog – we correct for these factors to show your real fitness level. Track your progress and know if you’re improving and facing tough weather.

No account required.
No ads.

▷ CORRECTED VO₂, ANY WEATHER
- Removes temperature, humidity, altitude, heat, cold, etc.
- Raw vs Corrected shown side-by-side
- Trust the trend, not the temperature

▷ IMPACT RESULTS
- Automatic correction the moment you finish your run
- Be first to see your real fitness trend — no more confusion
- See when you're getting fitter even when it doesn't seem like it

▷ SCIENCE-BACKED CORRECTIONS
- Research-based penalties for weather & elevation
- Transparent impact per condition
- Spot real changes vs. bad weather

▷ AUTOMATIONS
- Apple Watch sync
- Health app sync
- Workout logging
- VO2 corrections, no manual input needed

▷ WHAT'S FREE?
- No ads
- Unlimited runs/workouts
- Corrected VO₂ max vs. weather
- Raw Apple Watch VO₂ max vs. Corrected VO₂ max
- See your daily corrected trend
- See your weekly corrected trend
- Weather logging
- Record your activities
- Basic insights about your performance

▷ WHAT'S PLUS?
- Instant weather capture as soon as you finish your workout
- Most accurate VO2 max correction every time
- Clear & transparent impact per weather condition
- See your monthly corrected trend
- See your yearly corrected trend
- Improve your VO₂ max with Full Insights
- Personalized performance takeaways
- Cardio fitness trend graph
- And more

Try Plus free for 7 days. Cancel anytime.

▷ PRIVACY
- No account needed
- No tracking
- No ads
- No personal data collected
- No third-party SDKs
- All logged info (runs, corrected VO2 max, etc.) remains on-device

Not a medical device. True VO2 Max is for fitness and wellness only.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/