Support
The app couldn't read my mark
Marks are tiny and often worn. What helps most, in order: crop tight to the stamp before scanning; tilt the piece against a light source until the letters catch a shadow; avoid direct flash, which flattens the relief. If it still won't read, type the characters in manually — the decoder works exactly the same way on typed marks, and costs you nothing from your daily allowance.
I think a value range is wrong
Tell us the mark and what you're seeing in sold listings. Ranges are estimates for pieces in good condition, and condition, size and pattern move them a lot. We update the library regularly and genuinely want to hear about ranges that look off.
A mark is missing from the library
Send us a photo and we'll look at adding it. The library grows from exactly these reports.
Restoring a purchase
Open the Pro screen and tap Restore. Purchases are tied to your Apple ID, so make sure you're signed in with the same one you bought with.
Cancelling a subscription
Subscriptions are managed by Apple, not by us. On your iPhone: Settings → your name → Subscriptions → Backstamp → Cancel. Cancel at least 24 hours before the renewal date to avoid being charged for the next period.
Deleting my data
Delete the app. Your ledger and install identifier live on your device and go with it. See the Privacy Policy for the full picture.