What Critical Function stores.
Clear information about the current self-hosted application.
Accounts
We store your display name, email address, verification status, and a password hash. We do not store your password as readable text. Verification and password-reset emails are delivered through the site’s configured email provider.
Sessions and problem PDFs
Hosts can access the sessions and PDFs they own. Teams can see their own submitted answers. The paired display shows the selected problem and public results; it cannot access the host’s account controls or ungraded answer list.
Devices and cookies
Essential cookies keep a host signed in, a device connected to a team, or a display paired. Unsent answers are kept in the current browser tab until submitted. This build does not include advertising or analytics trackers.
Keeping and removing data
Session history and uploaded PDFs remain until the host deletes them. Archiving a session closes access but does not delete its history. Hosts can export results before deleting a session. Account removal currently requires contacting the site operator; self-service account deletion is not yet available.
Share only what the group needs
Use team nicknames and problem-only PDFs. Avoid uploading personal student records, answer keys, or other information that the group should not see. A session code is an invitation—share it with your intended participants.