What Zukan knows about you
An email address, and your collection. No analytics, no advertising identifier, no uploaded photos.
The only personal data Zukan asks for is the email address you sign in with. There is no analytics SDK, no advertising identifier and no ad, which is why the app never shows a tracking prompt.
Card photos are read on the device and never uploaded. Your collection is saved to your account so it can follow you between phones; nothing in it is sold or shared.
The full policy, in plain language, is the privacy policy.