Sequence diagrams.
Cool as shit.

Open source sequence diagrams with a visual editor and concise text. Boil 'em, mash 'em, stick 'em in a stew.

See the showcase Explore features
  • Best for AI agents
  • Runs in the browser
  • Free and MIT

Live diagram

Loading the live diagram
Visual changes update the text. Text changes update the diagram. Read the agent guide ↗
Same source
Edit the diagram visually or change the text. Both stay in sync.
For agents
Agents can write and check the text without opening the visual editor.
Automatic layout
Describe the order. Lines & Arrows places the actors, messages, groups, and gaps.
Drawn in the browser
The page draws the diagram. Its source is not sent to a rendering service.
Dependency-free runtime
The renderer uses browser-native JavaScript with no runtime package dependencies or rendering server.
Add it to a page
Use the CDN, host it yourself, or install the package. No framework is required.