Hubble: Open-source notetaking app for you and your agents

handfuloflight 80 points 22 comments July 29, 2026
www.hubble.md · View on Hacker News

Discussion Highlights (13 comments)

flippyhead

I feel like there's not enough content on the landing page to help me understand why I need yet another notetaking app. The burden of proof is high given how many of these there are.

firasd

Looks interesting. The dual interface from the start (React UI for humans and just editing .md for the agents with skills) is an interesting idea and probably how a lot of new software projects will work going forward I feel like tables are generally underrated while the AI ecosystem is focused on .md files but I guess markdown has tables so they’re included to some extent

ernsheong

All my agents need are plain .md files in my project directories.

Brajeshwar

Will check this out too. Now, I'm having fun with tldraw.[1] With their new tldraw offline, I can continue to work in Claude Code (and others) and I can either output or interact/input from tldraw. This is more of a free-form, infinite canvas. I treat it like Excalidraw + Draw.io + Freeform Notetaker. For text, most agents/LLM/assistants are pretty happy and smart using the same Markdown files to anywhere I have allowed them to interact. 1. https://www.tldraw.com/

chaidhat

so, Obsidian?

egeozcan

I also have one I developed according to my use: https://github.com/egeozcan/mahpastes It has a rest api and a cli tool, and also the possibility to make headless deployments, and it can sync clips without a sync server. It can serve folders/tags and optionally expose a read or read/write api for JSON files on the same level. It supports lua plugins, and I have a fal.ai plugin to generate/edit images already in the repo (some other examples there). It has a lot of features so maybe it's better if I just link to the docs: https://egeozcan.github.io/mahpastes/

Ycros

midwit meme, but both ends are just "a pile of .md files in a synced directory somewhere"

eluru

but how is it different from my notion?

Catloafdev

How is this different from Obsidian? Why would someone switch? The page is a bit lacking on detail.

lhd1

can we have a moratorium on notetaking apps?

shreddude

I’ve been waiting for an app like this to be developed! .md files can be opened from Finder! The tree file view is just like I’m used to with Obsidian! Frontmatter support! There’s even an editor toolbar. Almost everything on my wishlist for a Markdown editor, except for Mermaid rendering. Since this project uses such good agentic engineering practices, I was able to use Claude Code to add support for Mermaid diagram rendering and produce my very own local build on Mac, all in about 30 minutes. Thank you! Hubble+cmux gets me close to the agentic IDE I’m working towards.

gverrilla

I have always found markdown cumbersome. Will try this later. Seems like the main thing is having agent input right there, which is handy.

madhu_ghalame

It would be interesting to see benchmark comparisons with traditional EHR integration solutions in terms of speed and reliability.

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