Your work stays on this device

Saved lessons, print settings, and practice progress are stored in your browser. No account, class roster, name, email address or microphone is needed.

Anonymous site statistics

The public test site collects anonymous page visits, clicks and active time to help improve the lessons. Active time counts while a page is visible and you have used it recently; time in the background or left idle is excluded. Lesson actions use fixed lesson and task identifiers.

Your answers, search text, names and downloaded work are not sent with these statistics. Student answer text is not saved. Advertising is disabled.

Data on this device

Local activity records include the lesson, action, time and anonymous session identifier. The local development version does not upload these records. If browser storage is unavailable, the lesson remains usable and progress lasts for the current session.

Clearing lesson data removes saved lessons, settings, practice history and local activity records. Your statistics preference is kept. Disabling statistics stops future collection; it does not delete information already collected.