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.