Privacy Policy

Challenge Tracker: MET Hours · Last updated 13 July 2026

The short version

We collect nothing. Challenge Tracker: MET Hours has no accounts, no analytics, no advertising, and no servers. The app never connects to the internet. Every piece of data you see in the app lives only on your device, protected by Apple's on-device security.

Health data

With your explicit permission, the app reads workouts, active energy, heart rate, resting heart rate, date of birth, and body weight from Apple Health to calculate your MET-hours and heart-rate zones. This processing happens entirely on your device. Health data is never transmitted anywhere, never shared with anyone (including us — we cannot see it), and is deleted when you delete the app or use the app's "Clear All Data" option. You can revoke Health access at any time in Settings → Privacy & Security → Health.

What we don't do

• No data collection of any kind — health, personal, usage, or diagnostic
• No accounts, sign-ins, or identifiers
• No third-party services, SDKs, analytics, or advertising
• No network connections from the app

The App Clip

The App Clip works the same way: workouts you log in it are stored only on your device. Opening the CHALLENGE Trial research paper from the Clip uses an in-app browser to load a public webpage (PubMed); no data about you is sent.

Not a medical device

The app is an educational tracking tool, not a medical device, and does not provide medical advice. Always consult your healthcare professional before beginning or changing an exercise program.

Contact

Questions? See Support.