Violet UML Editor

At a glance

• Editor score
  6.6 / 10
• Pricing
  Open source
• Best for
  Basic browser or desktop UML editing
• Paid from
  Free
• UML diagram types
  Class, activity, object, sequence, state, use case
• Facts checked
  22 Sep 2026

• Where it wins

  • Supports class, activity, object, sequence, state, and use-case diagrams
  • Available through an online editor and desktop versions
  • Open-source Java/Maven project with separate diagram plugins

• Where it doesn't

  • Focused on diagram editing rather than model-to-code workflows
  • Desktop support is limited to Windows and Linux
  • No collaboration or model-repository workflow is part of its stated scope

Our verdict on Violet UML Editor

Violet UML Editor is an open-source tool for creating and editing UML diagrams in a browser or on desktop systems. It fits students, developers, analysts, and teams that need a straightforward way to work with common UML notation without making model-to-code workflows the center of the product. The supported diagram set covers class, activity, object, sequence, state, and use-case diagrams, giving it practical breadth for basic UML documentation and design work.

Its main strength is coverage across web and desktop use. The online editor supports browser-based diagram editing, while desktop packaging is available for Windows and Linux, including executable and Debian-related products. The Java/Maven source project is organized with separate plugins for activity, class, object, sequence, state, and use-case diagrams. That structure makes the project relevant to users who want an open-source UML editor with a visible Java-oriented project layout, rather than a closed commercial application.

Violet UML Editor is most suitable when the priority is drawing and editing standard UML diagrams across basic browser or desktop environments. It is less suitable for teams seeking model-to-code workflows, reverse engineering, collaboration, or a model repository as central parts of the tool. Choose it for focused diagram work and open-source availability; consider another product when shared modeling processes or broader engineering workflow features are essential.

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Violet UML Editor pricing

Violet UML Editor fact sheet

Alternatives to Violet UML Editor

• IBM Engineering RhapsodyA broad engineering suite for teams connecting models, code, requirements, and verification.9.3
• Sparx Enterprise ArchitectA broad enterprise modeling suite with deep repositories, engineering and versioning features.8.9
• IBM Rational Software Architect DesignerA broad enterprise modeling platform for teams that need traceability and transformation workflows.8.9

See all Violet UML Editor alternatives →

Featured on iTechGuides

Violet UML Editor is listed in our UML Modeling Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update