GalaxyBrain
GalaxyBrain 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…
GalaxyBrain launched on April 20, 2026 with 97 votes, #430 of 21,248 launches that month and more than 95% of that year's launches.
What it does
GalaxyBrain is a local-first knowledge system where pages have variables, formulas, and live references between them. Define a value on one page, reference it from another, and it stays in sync automatically. Like a programming environment crossed with a document editor. Everything is stored as structured JSON files on your machine. There's a built-in HTTP API and MCP tool so you can point Claude Code, Codex, or a local model at the same folder and build on top of it. No account needed.
An information operating system powered by local files.
Write like a document, calculate like a spreadsheet. Ready for you and any AI you point at it. Write like a document, calculate like a spreadsheet. Turn messy information into structuredfrom galaxybrain.com
In the maker’s words, at launch
GalaxyBrain 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…
Does a similar job
all alternatives →- GCGalaxybrain.com – a JSON-based knowledge system2025 · ▲31
Hi HN, I’d like to share a project I’ve been working on called GalaxyBrain. It’s a tool for organizing information. Key features: Embeddable dynamic metadata: as you type, metadata is generated in the background. This metadata can be accessed and embedded directly into the page. Light programming concepts built in: you can add custom values (think variables) to any page, then reference those values across different pages to build dynamic relationships. Metadata can be chained together: referencing values on other pages, or by using a formula. Updates to anything flow through the entire…
Sheet NinjaMar 2026 · sheetninja.io · ▲340Turn any Google Sheet into a live API in seconds. The fastest way to ship vibe coded apps and frontend projects. Don't overthink it. Just ship it ⚡️
OzBrain, a shared brain for knowledge between agents and your teamAug 2026 · ozbrain.com · ▲93I think agent-first chat interfaces will be a primary software modality and busy dashboard/UI will go away. I’m not sure who exactly wins it, but I want my knowledge to grow/go with me. A lot of the “knowledge” ie research, analysis, reasoning will be done by agents as the primary user. Our current notes tools & tasks management systems were built for humans… I don’t care what the 17th thing on my bug backlog is. I want to conduct agents that can execute for me and do great work. What I built OzBrain to do: + Create a central place for agent reasoned knowledge to live + Be agnostic…
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