Go to Profile › gear icon › Delete account, at the bottom of Settings, and confirm. StemNotes deletes your account and everything we hold for it: your settings, fuel plans, linked devices, Garmin rides and any unused credits. Fuel-plan notes we added to your training calendar are removed too, and the app clears your data from this phone.

Cancel any subscription first (see Cancel Pro), because deleting your account doesn't stop it. A paired Apple Watch keeps the last plan it received until you remove the app from it.

If you see "Couldn't delete your data", nothing has been deleted yet. Check your connection and try again.