Galaxybrain.com – a JSON-based knowledge system
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…
In plain words
Galaxybrain.com is a JSON-based knowledge organization system that generates metadata automatically as users type and allows embedding that metadata into pages. It includes lightweight programming features like custom variables and formulas that can reference values across different pages, with updates flowing through the entire system like a spreadsheet. The tool runs on local JSON files and is free to self-host, with a hosted version planned. It's designed for people who want to build dynamic information models and interconnected knowledge systems.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
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 system (like a spreadsheet). It runs on local JSON files: plan is to offer a hosted version, with structured end points for everything so you can use it as a datastore. If you host the json files locally it will be free forever. I use it to build a model of my life. Everything I care about has a page, each with its own dynamic metadata that updates in real time as things change within the system. Each page acts like a little dashboard for that thing. The app is pretty sprawling, and there's still some bugs on the fringes. I'm onboarding people slowly and fixing bugs as they come up. I wanted to share it early to get feedback and see if I was onto something. Demo link: https://galaxybrain.com
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