Privacy Policy for Perf: Stamp Identifier & Value
Last updated: 2026-07-29
This privacy policy explains how Perf: Stamp Identifier & Value (the "App") handles your data.
Data the App Collects
This app uses the following iOS capabilities:
- Camera — Camera access is used only when you photograph a stamp or an album page. That photograph is sent to our identification service so the stamp can be identified, and is then kept in your collection on your device. It is not linked to your identity, because the app has no accounts.
- PhotoLibrary — Photo library access is used only when you choose a photograph to identify. The photograph you choose is sent to our identification service for that purpose and is then kept in your collection on your device. The app does not read your library otherwise.
How identification works
Identifying a stamp needs more computing power than a phone has, so the
photograph you choose to scan is sent to our identification service at
scalingwebapps.com, which passes it to a vision model through OpenRouter
(https://openrouter.ai). The result comes back to the app for you to confirm.
What that means for your data:
- Only photographs you choose to scan are sent. Nothing is uploaded in the
background, and the rest of your collection never leaves your device.
- Photographs are not stored by the service beyond the short period needed
to return a result and to give the same answer if you scan the same picture
twice.
- Photographs are not used to train AI models. OpenRouter and its providers
process this traffic under no-training policies.
- There is no account, so nothing is linked to you. The service holds only a
random identifier generated on your device, used to count the free daily
allowance and nothing else.
- The model provider's key is never in the app. It stays on our server.
Your collection
Your collection is stored on your device and, if you are signed in to iCloud,
synced privately through your own iCloud account using Apple's CloudKit. We
cannot see it. There is no login, no server-side copy, and nothing to delete on
our side if you remove the app.
Anonymous usage counts
The app records anonymous usage counts through Aptabase, a privacy-first
analytics service — for example that an identification happened, or that a page
scan produced a result. These are counts and coarse bands only. They never
include a photograph, a stamp name, a note you wrote, or anything else from
your collection, and they are not linked to your identity or used for tracking.
For Aptabase's privacy practices, see https://aptabase.com/legal/privacy.
Subscriptions and Purchases
Subscription and in-app purchase processing is handled by Apple via the App Store and by RevenueCat, our subscription analytics provider. We receive anonymized purchase and subscription status information necessary to deliver the features you've paid for and to provide customer support. We do not see your full Apple ID or payment card details.
For Apple's privacy practices regarding App Store purchases, see https://www.apple.com/legal/privacy/.
For RevenueCat's privacy practices, see https://www.revenuecat.com/privacy.
Data the App Does NOT Collect
- We do not collect personally identifying information beyond what Apple provides as part of receipt validation.
- We do not use third-party advertising networks.
- We do not sell or share your data with third parties for marketing.
- We do not track your activity across other apps or websites.
Children's Privacy
This app is not directed at children under 13 and does not knowingly collect data from children.
Your Rights
You may delete the app at any time to stop all data collection. To request deletion of any data associated with your purchases, contact us at the support address below.
Contact
If you have questions about this policy, reach us at: https://scalingwebapps.com/support
This policy applies to Perf: Stamp Identifier & Value only. Other apps published by the same developer have their own policies linked from their App Store listings.