Show HN: GalaxyBrain – an information operating system powered by local files
galaxybrain.comGalaxyBrain is a local-first knowledge system where pages have variables, formulas, and live references between them.
Every page can have custom variables defined on it, like a lightweight programming environment inside a document. Those variables become metadata you can access and reference from any other page in the system. Change a value anywhere and everything connected to it updates in real time.
All data is stored locally as structured JSON files. There's a built-in HTTP API and an MCP tool, so anything you can do in the app you can do programmatically. Point Claude Code, Codex, or a local model at the same folder and build on top of it.
It runs in the browser. The entire app is a single HTML file. No account needed. It's deceptively complex under the hood. You might find some rough edges on the fringes but the core is solid.
Would love feedback, and if you think this approach has potential.
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