Simple text in. Brilliant diagrams out.

Write a few readable lines, watch the diagram render — 40+ chart types, free, no sign-up.

How it works

From a thought to a diagram in seconds

1

Write plain text

Describe your diagram in a few readable lines. No dragging, no fiddling with anchor points.

2

Watch it render

Layout, spacing, and styling are handled for you — a polished diagram appears as you type.

3

Ship it anywhere

Export, embed, or drop it into your docs, app, or notes. It stays in sync with the source.

Why Diagrammo

40+ chart types

Sequence, flowchart, ER, Gantt, org, class, maps, and a whole lot more — one simple syntax for all of them.

Diagram-as-code

Plain text that lives in git, reviews like code, and never drifts out of date the way drag-and-drop pictures do.

Yours & private

Runs locally in the desktop app and your browser. Your diagrams never leave your machine unless you share them.

Free, no sign-up

Open the editor and start drawing. No account, no paywall, no watermark on what you make.

Works where you already work

Claude
Cursor
CLI
npm
HTML
Obsidian
Astro
Docusaurus
Fumadocs
Nextra
VitePress

Your first diagram takes under a minute

Open the editor and start typing. No account, no install required.