Privacy and data
Drills
Diagrams are files on the iPhone or iPad that drew them. RinkPad has no account and no server copy. Deleting a drill in the library, or deleting the app, is how you delete that data. A new phone does not inherit the library unless you move the device backup yourself through Apple.
Ads
Until you buy Remove Ads, a cold start can show a Google app-open ad, and the expanded palette can show a banner. The ice itself is not an ad slot. Requests are non-personalized, and the app does not ask to track you across other apps. Google still receives the usual ad-request data (for example IP address and device type). Details are in the privacy policy.
Remove Ads
The purchase is handled by Apple. The app asks StoreKit whether this Apple ID is entitled. The $ control stays in the palette so you can restore on another device signed into the same Apple ID.