Support

One account covers both this website and the iOS app. Sign in with the same email and password in either place and your progress, streak, badges, and review queue follow you.

Password reset is not yet self-service. Email dt323259@gmail.com from the address on your account and you will get a way back in.

In the app: Profile → Delete Account. It asks you to type DELETE to confirm, then permanently removes your account and all of your coursework. See the Privacy Policy for exactly what gets removed.

Lectures stream from YouTube, so playback needs a working internet connection and an unblocked YouTube. If a video shows an error, check your connection first, then try the same lecture on the website — if it plays there but not in the app, that is a bug worth reporting.

Practice drills run entirely on your device and work with no connection. Anything you complete offline is queued and synced the next time the app can reach the server, so your scores and streak stay correct.

Email dt323259@gmail.com. For a bug, the lecture or drill you were on and what you expected to happen is enough to go on.