Privacy & AI processing

koios sends the study material you provide—text you paste, PDFs or links you add, and quiz configuration you choose—to our AI providers so we can generate quizzes, flashcards, grade short answers, and explain mistakes using your sources.

Content is processed to produce results for you; we do not use your materials to train public models.

Data retention: your projects, sources, quizzes, and flashcards stay in your account until you delete them. Uploaded PDFs are processed for text extraction and we do not store the raw PDF file bytes after extraction. If you add a PDF or YouTube link, we store the URL you provided so we can re-run extraction later.

Account deletion: when an account is deleted, associated workspace data is deleted as well (projects, sources, quizzes, flashcards, and usage logs) subject to database cascades.

Read-only quiz links only expose the quiz title and questions you already generated; anyone with the link can view and take that snapshot. Do not share links if the content is confidential.

Anonymous home previews use browser cookies for usage limits only.

Last updated March 2026. For requests or questions, use the contact on the pricing page.