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Alternatives

12 best PlantUML alternatives (2026)

PlantUML is filed as open source Dev Tools software, best for UML and docs-as-code diagrams. Veteran diagrams-as-code for UML-heavy teams. We grouped picks by shared shelf tags and our own comparisons. This page lists 12 tools shoppers compare against PlantUML in our catalog — not vendor rankings.

At a glance

Tool
PlantUML
Pricing
Open Source
Platforms
CLI IDE CI
Alternatives listed
12
Tags
Diagrams

Full PlantUML record · Data is from our catalog, not vendor reviews.

Alternatives

  1. 1Mermaid Live Editor
    Open Source · Web Markdown

    Default docs-as-code diagram path.

    same tags

  2. 2draw.io
    Open Source · Web Desktop Confluence

    Deepest free shape library for formal diagrams.

    same tags

  3. 3Graphviz
    Open Source · CLI libraries

    Foundational layout engine many tools wrap.

    same tags

  4. 4D2
    Open Source · CLI VS Code CI

    Contemporary diagrams-as-code with beautiful layouts.

    same tags

  5. 5Diagrams Python
    Open Source · Python CLI

    Infra diagrams from Python in CI.

    same tags

  6. 6Kroki
    Open Source · API Docker

    One renderer gateway for polyglot diagrams-as-code.

    same tags

  7. 7Markmap
    Open Source · Web VS Code CLI

    Mindmaps from nested Markdown lists.

    same tags

  8. 8ChatUML
    Freemium · Web

    Conversational UML sketching.

    same tags

  9. 9Eraser
    Freemium · Web VS Code

    AI + tech-doc diagrams for architecture flows.

    same tags

  10. 10Whimsical
    Freemium · Web

    Fast pretty flows without Miro ceremony.

    same tags

  11. 11Miro
    Freemium · Web Desktop Apps

    Default facilitation whiteboard for product teams.

    same tags

  12. 12dbdiagram.io
    Freemium · Web

    Best lightweight ERD-as-code.

    same tags