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This website stores your username and password, and the list of exercises you have and haven't checked. The password is stored securely, but you should not reuse a password that you use elsewhere.
This website does not record your email address, so there is no way to recover a lost password, nor to inform you of a data breach. If you use a username and password that is in use elsewhere then this website and its owners accept no liability in case of a data breach.
This website neither attempts to track you nor - to our knowledge - uses anything that allows other sites to track you.