Need help with the app? Found a bug? Have a feature suggestion?
Email valentina.farcasanu@icloud.com — please include:
We aim to reply within a few business days.
If a run ends but isn’t in your history, force-quit the app and reopen it — pending runs from your watch are imported the next time the iPhone and watch are both online. If it still doesn’t appear, email us with the approximate start time of the run.
Make sure both devices are unlocked and near each other. The Apple Watch app needs to be installed via the Watch app on your iPhone. If it’s already installed, opening the Watch app once usually re-pairs the connection.
Open Settings → Heart Rate Zones. Pick a method (Max HR or Karvonen) and confirm your Max HR (and Resting HR if using Karvonen). If you enable “Sync to Apple Health”, the app will read your latest values from Apple Health automatically.
Delete the 0to42K app from your iPhone to remove all data the app stores. Workouts that were saved into Apple Health remain in the Health app — you can delete those individually from inside the Health app.
See the Privacy Policy for details on what the app stores and what it doesn’t.