DiagramGPT - AI-Powered Diagram Generation

VISIT DIAGRAMGPT

DiagramGPT Brief overview

DiagramGPT is a browser-based AI diagram helper that converts text descriptions into clean technical diagrams and Mermaid.js code. It is built around Mermaid, a popular text-to-diagram syntax, and is hosted at diagram-gpt.fraserxu.dev with a public codebase on GitHub.

Instead of dragging shapes around by hand, you describe the flow or system in natural language or simple Mermaid syntax. DiagramGPT then produces the corresponding diagram (flowcharts, sequence diagrams, class diagrams, user journeys, Gantt charts and C4/C4C‑style system diagrams are commonly supported).

Third‑party directories position it as a lightweight tool for developers, project managers and designers who need quick diagrams for documentation, planning, and presentations, without investing time in full-blown diagram suites.

How-to-use

1. Open the web app
   Go to https://diagram-gpt.fraserxu.dev. You will see a Mermaid code editor and a preview panel.
2. (If prompted) Add your OpenAI API key
   Some guides describe DiagramGPT as using your own OpenAI API key to generate diagrams from natural-language prompts. Once set, the app can call the model on your behalf.
3. Describe the diagram
   • Either type a natural-language description of what you want (e.g., “user logs in, system validates credentials, then redirects to dashboard”), or
   • Paste/edit Mermaid code directly (e.g., a flowchart, sequenceDiagram, or gantt block).
4. Generate and refine
   • The app produces Mermaid code and renders the diagram preview.
   • Tweak the text or Mermaid code to adjust nodes, labels, or flow, and regenerate as needed.
5. Edit or export
   • Click the Edit link to jump into the Mermaid Live editor for deeper editing.
   • Use Copy code to grab the Mermaid definition, or Copy SVG to export the rendered diagram for docs, slides, or wikis.

DiagramGPT Key features and functions

• Natural-language to diagrams
  Designed to interpret text and map it to diagram structures (flowcharts, sequence diagrams, class diagrams, user journeys, Gantt and C4/C4C diagrams).
• Mermaid.js-based rendering
  Uses Mermaid.js under the hood, so everything is text-based and version‑control friendly. Your diagrams are really just short snippets of code.
• Built-in code editor + live preview
  A simple editor lets you write or paste Mermaid code and see an instant visual preview, making it easy to adjust logic or layout quickly.
• One-click editing in Mermaid Live
  An “Edit” button opens the current diagram in the official Mermaid Live editor, giving access to more advanced editing options.
• Copy Mermaid code and SVG output
  You can copy the underlying Mermaid code or export an SVG version of the diagram to embed in documentation, knowledge bases, or slide decks.
• Public GitHub project
  The full project is available on GitHub under fraserxu/diagram-gpt. The README describes it as a web app for generating diagrams from natural language using Mermaid and Next.js; however, no explicit open‑source license is currently listed.

Pricing

Web app usage
Third‑party AI tool directories list DiagramGPT (fraserxu.dev version) as having a starting price of “Free”, and reviews and write‑ups describe it as a free‑to-use web application with no sign‑up requirement.

API/LLM costs
When DiagramGPT uses your own OpenAI API key, you pay OpenAI directly for any tokens consumed. DiagramGPT itself does not currently advertise paid plans or usage-based pricing on its site or GitHub; it acts as a thin UI over the model.

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