Support
Questions, a problem, or a mistake in a question or translation? Write to us. Please include your phone model and the question number ("Frage …") if it's about a question.
Email: theinertiaprojects@gmail.com
I bought Premium but it's not unlocked
Open the app, go to Settings → Premium → Restore purchase. Use the same Apple ID or Google account you bought it with.
How do I get a refund?
Purchases are made through the App Store or Google Play, so refunds are handled by Apple (reportaproblem.apple.com) or Google (play.google.com → Order history).
How do I change my language or federal state?
Home → the gear icon (Settings) → Study. Your progress is kept.
The daily reminder doesn't arrive
Check that notifications are allowed for the app in your phone's settings. The reminder is skipped on days you've already practised.
How do I delete my data?
Settings → Your data → Reset progress deletes your learning data. Uninstalling the app deletes everything it stored. We don't have a copy.
I found a mistake in a translation
Thank you! Email us the question number and language, and we'll fix it in the next update.