A safe space for your notes — free, open source, and yours offline.
Your work lives on your machine. OpenBook works offline. Sync and self-hosting are optional. OpenBook backs itself up automatically, out of the box.
- Build calculators, charts and dashboards that update as you type — and see how they're wired.
- Put spreadsheets inside your pages. Filter, sort, and switch between table, board, calendar, timeline, map and more.
- Keep pages inside pages. Open them in tabs, windows, or side by side.
- Deleted something? Get it back from the Trash.
- Export self-contained HTML that stays interactive offline.
- Add custom blocks, commands, and integrations with plugins.
See the full feature tour.
Get the latest release.
- macOS: Apple Silicon and Intel
- Linux:
.deb,.rpm, and.AppImage - Windows: coming shortly
OpenBook works offline with no account. For sync or collaboration, self-host the server or publish a library to book.cloud. book.cloud requires a free account.
Issues and contributions are welcome. Code quality is the bar. AI-generated PRs are accepted, but must meet the house standard. A CLA is required. See CONTRIBUTING.md.
Found a security issue? Report it privately — see SECURITY.md.
OpenBook is released under the MIT License.