This app is built to need as little of your information as possible. There is no account, no sign-in, and no request for your name, email address, or anything else about you.
When you first open the app, it creates a random identifier on your device, something like a string of letters and digits. This identifier is the only thing that connects you to your data. It is not derived from your device, your Apple account, or anything personal.
Your study progress is stored on our server under that identifier: which decks you have added, where each card sits in the review schedule, and a history of your reviews with their timestamps and outcomes. This is what lets your progress survive reinstalls and sync between devices.
On iPhone the identifier is also kept in the device's keychain, which Apple's iCloud Keychain can carry to your other iPhones. That is how your progress comes back after a reinstall or on a new phone. We never see your Apple account.
There are no advertisements, no analytics packages, and no trackers of any kind. Your data is never sold, shared, or used for anything except running your own review schedule. The app talks only to our own server.
Like nearly every web server, ours keeps routine technical logs of requests, which include IP addresses. They are used only to keep the service running and are not connected to your study data.
If you buy anything in the app, the payment is handled entirely by Apple. We never see your payment details. We receive only Apple's confirmation that the purchase happened, which we use to unlock the content on your identifier.
Resetting the cascade inside the app returns every card to its deck. If you want the data tied to your identifier deleted from our server entirely, email us at the address below and it will be removed.
The app collects the same near-nothing from everyone, of any age: a random identifier and review history.
If this policy changes, the new version will be posted at this address with an updated date. Questions and deletion requests: danchap@gmail.com.