Privacy & your study data
On this browser
Saved lessons, recently opened items, playback positions, completion choices and language preference are stored in this browser. They are not synced to an account or another device. Clearing site data removes them. Private browsing or blocked storage may prevent saving.
Questions and answers
Your question and up to three previous questions in the current conversation are sent to this site’s Cloudflare-hosted service and Workers AI to find passages and prepare a response. The conversation is held in the open page, not saved as a chat history by this application. Leaving or reloading the page clears it. The application does not log question or answer text.
Library search
When a search finds no lesson, the site keeps the normalized search text and how many times it was searched that day, with no network address or identifier, to learn what the library is missing. Text that looks like an email address or phone number is never kept, and searches that find lessons are not stored. These records are deleted after 90 days.
Service and error reports
The hosting provider processes technical request data. The application uses a daily hash derived from a network address to limit abuse; it does not store the address in its rate-limit table. Expired limit records are removed during service requests. Reports submitted through the help form are stored privately for site maintainers to investigate. Do not include private information; no name or email is required.
Original media
Embedded YouTube players and original audio/PDF links connect to their providers, which have their own privacy practices. YouTube may receive technical data when its player loads.