All data (counters and their corresponding data, photos, notes) are retained only within the app itself and in private iCloud storage (when enabled). The developers of the Knit and Crochet Counter app have no access to any such data unless explicitly shared through the app’s sharing feature or the “Request Support for this Counter” button on the Counter Settings page.
Ads may be displayed (when not disabled through an in-app purchase). These are provided by a third-party and no information regarding a user’s interaction with the ads is provided to the app developers. The “Advertising Identifier (IDFA)” is used by a third-party to offer targeted ads. This may disabled in the device’s Settings > Privacy > Advertising > Limit Ad Tracking.