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Each module unlocks once you score 80% or higher on the current one. The number of questions per module varies, so the exact attempt count differs — but the accuracy threshold is the same throughout. There are no shortcuts; the requirement exists to ensure genuine retention before you move on.

Yes. In guest mode you can complete and replay the first 5 modules with no account required — your progress is stored locally on your device. To continue beyond that you'll need to create a free account. From there you can unlock the full app with a one-time purchase, or subscribe for access to all current and future content as we continue to add new modules.

Subscriptions are managed entirely through Apple or Google, not through us. On iOS, go to Settings → your name → Subscriptions. On Android, open the Google Play Store → Profile → Payments & subscriptions → Subscriptions.

Make sure you're signed in to the same account on both devices and that you have an active internet connection. If the issue persists, sign out and back in on the device that's out of sync — this triggers a fresh pull from the server.

You can delete your account directly from within the app. This immediately and permanently removes all your personal data and practice history from your device and our servers. You can also request deletion by emailing us.

Check that your device is not set to silent mode — on iOS this affects in-app audio even when media volume is up. Also try closing and reopening the app. If the issue continues, email us with your device model and OS version.