Privacy
What we read
With your permission, Grinda reads steps, walking distance and body weight from Apple Health. We use them only to track your races and show your progress. We keep daily and hourly step totals for your races to settle them and prevent cheating.
What we never do
Health data is never sold, never shared with advertisers, and never used for advertising or tracking. Grinda contains no ad or tracking SDKs.
Account and payments
You sign in with Apple, so we may receive your name and a private relay email. Payments are processed by Stripe; Grinda never sees or stores your full card number. Subscriptions are handled by Apple.
Where data lives
Account and race data is stored with Supabase, our database provider. Step data used for the home-screen widget stays on your device.
Your rights
You can delete your account and all associated data at any time in the app (You › Delete account). Live races are unwound in your favour: holds are released and charged stakes refunded. For access or correction requests under GDPR, email privacy@grinda.app.
Health data legal basis (GDPR Art. 9)
We process health data on the basis of your explicit consent, given in the Apple Health permission prompt, which you can withdraw at any time in Settings › Health › Data Access.