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Show HN: GalaxyBrain – an information operating system powered by local files

https://galaxybrain.com
2•j0ncc•1h ago
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 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.

Comments

nigardev•1m ago
curious how you handle the reactive updates. is it like a spreadsheet with a dependency graph, or more of an event-driven thing? the json storage part is clean but id imagine keeping the realtime sync snappy across many connected pages gets tricky

Learn Vim for the Last Time

https://danielmiessler.com/blog/vim
1•dolfmaggot•1m ago•0 comments

Build the Dam System

https://jsfour.substack.com/p/build-the-dam-system
1•js4•2m ago•0 comments

Show HN: Germball – Drone-deployed seeds triggered by soil moisture

https://www.indiegogo.com/en/projects/germball/germball--smart-seed-capsule
1•lukascodes•2m ago•0 comments

Corporate Bullshit Considered Harmful

https://chuniversiteit.nl/papers/corporate-bullshit
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Highlighting Interactive Code Blocks

https://www.redblobgames.com/blog/2026-04-16-highlighting-interactive-code-blocks/
1•ibobev•3m ago•0 comments

US birth records uncover an autism risk surge tied to common drugs

https://medicalxpress.com/news/2026-04-millions-birth-uncover-autism-surge.html
1•OutOfHere•3m ago•0 comments

Haversine Distance

https://www.4rknova.com//blog/2026/04/19/haversine-distance
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Porting Red Alert to the Browser

https://lab.rosebud.ai/engineering/porting-openra-to-the-browser
1•vladgl94•4m ago•0 comments

Local ML inference benchmark: PyTorch vs. llama.cpp vs. the Rust ecosystem

http://kvark.github.io/ai/performance/2026/04/19/tales-from-the-inference-land.html
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DanceUI: ByteDance's open source SwiftUI reimplmementation

https://github.com/bytedance/DanceUI
1•CharlesW•4m ago•0 comments

Show HN: fmsg – An open distributed messaging protocol

https://markmnl.github.io/fmsg/show-hn.html
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Qwen3.6-Max-Preview: Smarter, Sharper, Still Evolving

https://qwen.ai/blog?id=qwen3.6-max-preview
2•mfiguiere•5m ago•0 comments

RL Scaling Laws for LLMs

https://cameronrwolfe.substack.com/p/rl-scaling-laws
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The Silent Crisis Killing Our Children, and What We Keep Refusing to Do About It

https://comuniq.xyz/post?t=973
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Txpay.app Easy to share Crypto Payment links

https://txpay.app/
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Is there a musical-scale equivalent for story structure?

https://blog.quanten.co/is-there-a-musical-scale-equivalent-for-story-structure-clustering-screen...
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OSS Maintainers Need an Answer to AI Clean Rooms

https://12gramsofcarbon.com/p/open-source-maintainers-need-an-answer
1•theahura•9m ago•0 comments

Netgear Gets Mysterious Exemption to Trump FCC 'Router Ban,' Refuses to Say How

https://www.techdirt.com/2026/04/20/netgear-gets-mysterious-exemption-to-trump-fcc-router-ban-ref...
1•cdrnsf•10m ago•1 comments

Ask HN: How to help AI find financials in large PDF faster?

1•richardwong1•11m ago•0 comments

Conflating Ego with Intelligence

https://artagnon.com/art/ego
1•artagnon•12m ago•0 comments

Envcore – Python dependency tracking via runtime import tracing

https://github.com/JanBremec/envcore
1•janbr•13m ago•0 comments

Claude Researcher Skill

https://github.com/maher-naija-pro/claude-researcher
1•mahernaija•14m ago•0 comments

Who Gets the Last Homes in San Francisco?

https://datastream.substack.com/p/who-gets-the-last-homes-in-san-francisco
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Plzdontkillus: An experimental creator bootcamp about AI doom

https://www.plzdontkillus.com/
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Lasers create artificial stars for atmospheric measurement

https://www.eso.org/public/images/potw2616a/
2•orzi•16m ago•0 comments

The Way of Code – Rick Rubin

https://www.thewayofcode.com/#1
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A video is just a folder of JPEGs

https://flipbook.browserbox.io/
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Giving RISC-V 1024 registers for zkVMs

https://leonardoalt.github.io/riscv-x
1•exKitsune•19m ago•0 comments

Show HN: Actual Claude Tokenizer

https://tokenizer.robkopel.me
2•robkop•20m ago•0 comments

The Great CS Exodus: How AI Is Rewriting the Future of Computer Science Degrees

https://webmatrices.com/post/the-great-cs-exodus-how-ai-is-rewriting-the-future-of-computer-scien...
4•bishwasbh•20m ago•0 comments