Line9

A rendering engine for Mermaid diagram syntax that addresses default layout, sprawling flowcharts, and low legibility by re-laying out the same source with compact placement, orthogonal routing, and typographic styling. It is for developers and designers, including individuals and teams in business and consumer contexts who create or generate Mermaid diagrams manually or via AI agents. It is positioned as a replacement that keeps the same syntax and parser but replaces the rendering pipeline, delivered via a web viewer and a CLI with SVG/PNG export.

Key features

• Renders Mermaid syntax with new engine
• Compact layout with shorter arrows
• Fewer line crossings and orthogonal routing
• Typography-focused themes
• Aspect-ratio optimized flowcharts
• SVG and PNG export
• Shareable URLs and embed snippets
• CLI for terminal rendering
• AI agent render tool integration
• Paste-and-render web editor