DiagramGen
2026 · AI · Developer Tools
An AI Mermaid diagram generator — write a prompt between // markers and get a flowchart, sequence diagram or DFD rendered live.
Overview
DiagramGen is a split-screen editor for Mermaid diagrams. Type a plain-English prompt between // markers, press Enter, and an LLM writes the Mermaid code for you; the preview renders it instantly.
You can keep refining a diagram by describing the change ("add a retry step after login"), edit the code by hand, and export the result as SVG or a high-resolution PNG.
The Problem
Mermaid is great for diagrams in docs, but remembering its syntax slows you down. Describing the diagram in words is faster.
Key Features
- Prompt-to-diagram: write // your idea // and press Enter
- Update an existing diagram with a plain-English instruction
- Live, auto-rendering preview next to the editor
- Supports flowcharts, sequence diagrams and data-flow diagrams
- Export to SVG or 3× high-resolution PNG
Tech Stack
React, Vite, Mermaid, Groq (Llama 3.3)
Links
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