Privacy
What is stored
The service stores your e-mail address. The service also stores when you have signed in and which exercises you have done. The service also stores an estimate of your skill level and a daily estimate of your readiness, both worked out from your answers. If you give an exam date, choose a language for explanations or set study reminders, the service stores those too, and with the reminders your time zone. While you are signed in, the service also stores your device's network address and browser details for the length of the session. When you ask for a sign-in link or a code, the service stores your network address for a short time, so that the number of requests can be limited. If you sign in with a Google account, the service also stores the account's name, the address of its profile picture and the keys from Google that confirm the sign-in.
Why it is stored
The e-mail address is needed for signing in, because the service has no passwords. The exercise data is needed so that the service can show you your progress and choose questions that suit you.
Who the data is given to
The data is not sold and is not given to advertisers. The service uses outside service providers to send e-mail and to run the service.
How long the data is kept
The data is kept as long as your account exists. Sign-in data expires by itself after a short time.
Your rights
You can ask to see the data that has been stored about you. You can also ask for the data to be deleted.
Contact details
The publisher's name and address are at the bottom of every page.