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Best DiagramGPT alternatives

5 tools developers use instead of DiagramGPT, ranked by popularity. 4 offer a free plan and 2 are open source. Updated October 2026.

Free Open source Showing 1–5 of 5
  1. README-AI logo

    README-AI

    Free Open source

    Open-source Python CLI that reads a codebase and generates a complete README.md, including badges, install steps, and usage examples.

    Details Visit
  2. DocuWriter.ai logo

    DocuWriter.ai

    Free plan

    Generates API docs, READMEs, and UML diagrams from your codebase, with an Autopilot agent that refreshes documentation on every push.

    Details Visit
  3. Trelent logo

    Trelent

    Paid

    Docstring generator for Python, Java, JavaScript, and C#, paired with a zero-data-retention enterprise chat layer built on Claude and GPT-4o.

    Details Visit
  4. Autodoc logo

    Autodoc

    Free Open source

    Experimental CLI toolkit that walks a git repository and generates markdown documentation for every file and folder, queryable in natural language.

    Details Visit
  5. Supacodes logo

    Supacodes

    Free

    SaaS tool that writes and updates internal code documentation automatically on every GitHub push, across TypeScript, Python, Java, and more.

    Details Visit