Line9
A Mermaid rendering engine with its own layout algorithm — for diagrams you'd actually show your team.
- Category
- Developer Tools
- Launched
- August 6, 2026
- Stage
- Unknown
- Pricing
- freemium
- Founder
- jumpalongjim
- Website
- line9.ai
Mermaid is the rare developer tool that everyone uses and almost no one loves. The syntax is forgiving, the ecosystem is everywhere, and the output is often a mess. Nodes collide, edges snake across the canvas, and the diagram you pasted into a PR looks like it was drawn by a toddler with a mouse. For years, the standard answer has been: tweak the layout options, rearrange the nodes, or just give up and use a different tool. Line9, a new rendering engine for Mermaid diagrams, is making a different bet: the problem isn't your diagram — it's the layout algorithm underneath. And the only way to fix it is to build a new one.
Discovered via
- Hacker News Show HN · · Show HN: Line9 – A Mermaid rendering engine with its own layout