Nothing. StackFocus has no user accounts, no backend, and makes no network requests to us. Your photos, focus stacks, and edits stay in the app and your photo library. We never see them.
These are handled entirely by iOS permissions and used only for the purposes above.
The one-time unlock is handled by Apple's App Store via StoreKit. We don't run a payment server and don't receive your payment details — Apple manages the transaction and restores it across your devices. There is nothing for you to sign up for.
This marketing website (stackfocus.app) — not the app — uses Google Analytics 4 to understand aggregate, anonymous visits. That's standard website analytics, completely separate from the app, which contains no analytics at all. You can block it with any tracker blocker.
StackFocus is a photography tool with no social features, accounts, or data collection, and is suitable for all ages.
If this policy ever changes, the updated date above will change and the new version will be posted here.
Questions? [email protected]