The open-source notebook your AI tools write to.

Start a notebook.

Write notes by subject, keep your sources next to them, and ask a model about any of it.

Notes by subject
Markdown with code, and the PDFs and links you're reading, filed together.
Ask your notes
A model in your browser or on your own machine answers from what you wrote.
Your agents write here too
Claude Code, Codex and Cursor save and search your notes over MCP, and you sign off on what they add.

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It starts with a short tutorial, and you can export all of it whenever you like.

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