Write to support@ottohealth.xyz with what happened and, if you can, your iPhone and watchOS versions.
Managing your subscription
Otto Pro is billed by Apple through your Apple ID. You can view, change or cancel it any time in Settings → your name → Subscriptions on your iPhone. Cancelling keeps Pro active until the end of the paid period.
Restoring a purchase
If you reinstalled Otto or changed phones, open Otto's paywall and tap “Restore purchases”. Your subscription is tied to your Apple ID, never to an Otto account — there is none.
Your progress is yours
If your subscription ends, your training history, mastered levels, milestones and preferences stay safely on your device. Subscribing again picks up exactly where you left off.
Privacy questions
Otto keeps your health data on your device — see the privacy policy. For anything else, the same address above reaches us.