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Show HN: Reladraw – A diagram language where you decide where to place things

Reladraw, a new diagram language that lets users control element placement, was released on GitHub with an in-browser playground, an npm install option, and a skill for use with Claude and other agents. The creator said the tool aims to combine the layout control of Draw.io with the declarative approach of Mermaid and Graphviz, and to work well for both humans and agents.

read1 min views1 publishedSep 26, 2026

I love making diagrams to help understand, plan, etc. However, the options are (A) auto-placement languages like Mermaid or Graphviz (which don't let me decide how the diagram looks), or (B) software like Draw.io which are powerful but are very time consuming (and inefficient for agents to manipulate).

I wanted to have the benefits of both, where you can define a diagram in a diagram language, but also retain a high degree of control over what the diagram looks like.

I also wanted this to work well for humans and agents.

On the Github link, there's a playground where you can try it out without installation. There's also instructions for a simple npm install and for installing a skill you can use with Claude or other agents.

Comments URL: [https://news.ycombinator.com/item?id=49858513](https://news.ycombinator.com/item?id=49858513)

Points: 1

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