Last updated: July 17, 2026
Mettle is a social fitness game: your real-world steps power heroes who battle monsters alongside your friends. This policy explains what data the app handles and where it goes. The short version: your steps and game progress are stored to make the game work, nothing is sold, and there are no ads or third-party trackers.
Health data (steps and walking distance). With your permission, Mettle reads your daily step count and walking distance from Apple Health. Steps are converted into in-game damage and shown to the members of any party you join. Health data is used only for gameplay. It is never used for advertising, never sold, and never shared with anyone outside the parties you choose to join.
Display name. The name you enter is shown to your partymates and, if you appear on the leaderboard, to other players.
Game progress. Your heroes, coins, unlocks, and battle history are stored so the game works across your devices and after a reinstall.
Party data. Joining a party shares your display name, daily step totals, and in-game activity (deploys, claims, nudges) with that party's members. Parties are private: they are only reachable by their unguessable invite code.
All game data is stored in Apple's iCloud (CloudKit), tied to your iCloud account. We do not operate our own servers and cannot read your private identity record. Apple's handling of iCloud data is described in Apple's own privacy policy.
Health data is read from Apple Health on your device. Only daily totals (steps, distance) leave the device, and only to power the party features above; raw Health records never leave your phone.
If you allow notifications, the app sends gameplay alerts (a monster falls, a partymate nudges you, an encounter starts). You can turn these off in iOS Settings at any time.
Game data persists in iCloud so your progress survives reinstalls. To delete your data, remove the app and contact us at the address below and we will delete your game records. Leaving a party stops sharing your steps with it.
Mettle is not directed at children under 13 and does not knowingly collect data from them.
If this policy changes materially (for example, when sign-in accounts are introduced), the updated policy will be posted at this address with a new date.
Questions or deletion requests: danielchungfung@gmail.com