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HubbleJune 23, 2026

Hubble.md

Open Source
notetaking
open-source
Markdown
HTML

Explore Hubble.md

Visit the official website to learn more and get started

### TL;DR

Hubble.md is a free, open-source notetaking application designed for individuals and their agents. It offers a familiar writing experience akin to Notion or Apple Notes, but with full support for Markdown and HTML. Users can create and edit notes using Markdown shortcuts, `/` commands, and file properties/frontmatter. The application is agent-ready, allowing agents to collaborate by pointing them to the user's notes folder, with live-reloading as agents make edits. Additionally, Hubble.md enables users to build and view HTML-based apps within their notes, turning a folder of notes into various views like tables, bookshelves, or maps by installing specific skills and instructing coding agents accordingly.

Key Insights & Metrics

Pricing
Free
Cost structure
Version
1.0.0
Current release version
Hardware
macOS (Windows and Linux support not yet built)
Compute requirements
Category
Open Source
Licensing model
Region
United States
Primary region

Key Features

  • Markdown and HTML support
  • Agent collaboration with live-reloading
  • Ability to build and view HTML-based apps within notes
  • Familiar writing experience similar to Notion or Apple Notes
  • Free and open-source

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