Free · no sign-up · works everywhere

How do you want to use Diagrammo?

ChromeSafariFirefoxEdge

In your browser

Open the editor instantly. Files saved locally in browser storage (OPFS). Works on any OS.

Open editor

On your Mac

Native desktop app. Offline. Local files on disk. Auto-updates. Apple silicon Mac, macOS 12 or newer.

Download .dmg
ClaudeOpenAI CodexCursor

With AI

Install dgmo into Claude Code, Codex, or Cursor.

CLInpmHTML

In scripts & apps

CLI, npm library, or live rendering in a JS/TS app.

ObsidianAstroDocusaurusFumadocsNextraVitePress

In docs & notes

Drop a ```dgmo fence in Obsidian, Astro, Docusaurus, Fumadocs, Nextra, or VitePress.

With other people

Everything above works with no account. A space is the optional part — a set of diagrams other people can read or edit.

What a space is