An information operating system powered by local files
GalaxyBrain combines the concepts of an editor, a database, and a simple programming language.
GalaxyBrain exposes an MCP (Model Context Protocol) interface and WebSocket API that allows Claude, Cursor, and other AI tools to work with pages under the same validation rules as manual editing. Agents can traverse, search, and modify content without bypassing the application layer.
GalaxyBrain stores all pages as plain .jsonl files in a local folder on the user's computer. No account is needed, no data is sent to servers by default, and users can zip, back up, or share their entire workspace as a folder—maintaining full ownership and privacy.
GalaxyBrain can export the entire app and workspace as a single offline HTML file that runs from file:// in Chrome. Users can share this file with colleagues, and each person runs an independent copy against their own local folder.
GalaxyBrain lets users write prose and create structured pages with embedded variables, formulas, and live calculations. Pages can reference each other, aggregate data across linked pages, and auto-sort by metrics or custom variables—enabling a personal knowledge base that computes and updates in real time.
GalaxyBrain supports template pages with $NextNumber, $NextDay, and $DateToday placeholders that resolve when a real page is created from the template. This enables fast creation of journal entries, meeting notes, and numbered projects without manual setup.