Since privacy policy.
App data
Routine names, intervals, completions and reminder settings are stored on your device and can sync with your private iCloud account. You can remove routines in the app.
Usage information
Analytics services collect screen views and routine actions, purchase activity, and app and device identifiers to help improve Since.
Apple services
Apple handles purchases and subscriptions. If you use Siri or Shortcuts, Apple processes the information needed for that action.
Your data and your rights
Deleting the app may leave records in iCloud, analytics services or Apple’s purchase history.
Your rights may include access, correction, deletion and a copy of your data, depending on the law that applies. You may also restrict or object to processing, or complain to the ICO or your local privacy authority.
Other services
Service providers may process data internationally. See the Apple and Google privacy policies for their handling of data.