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Privacy Policy

What data does NTRVL access?

NTRVL reads the following from Apple Health with your explicit permission:

• Heart rate — live readings from AirPods Pro 3 or Powerbeats Pro 2 during workouts
• Resting heart rate — to calculate your personal HR zones
• Age & biological sex — for VO₂ Max classification (ACSM standards)
• VO₂ Max — to display your 90-day fitness trend

NTRVL writes the following to Apple Health:

• Workout sessions — so they appear in Apple Fitness and Health
• Heart rate samples — recorded during your workout

Where is the data stored?

All data stays on your iPhone and Apple Watch. NTRVL has no server, no backend, no cloud. Your workout history, HR zones, and profile settings are stored locally using Apple's on-device storage (UserDefaults and HealthKit).

Does NTRVL share data with third parties?

No. NTRVL does not share, sell, or transmit any data to anyone. There are no analytics SDKs, no tracking pixels, no ad networks, and no crash reporting services embedded in the app.

Network requests

NTRVL makes zero network requests. The app works entirely offline. No data ever leaves your device.

Accounts & authentication

NTRVL does not require an account. There is no sign-up, no login, and no email collection.

Children's privacy

NTRVL does not knowingly collect data from children under 13. The app is intended for users who can safely perform high-intensity interval training.

Changes to this policy

If we ever change how data is handled, we will update this page and the "Last updated" date above. Since the app has no server, we cannot push notifications about policy changes — check back here if concerned.

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Contact

Questions about privacy? Email hello@ntrvl.app.