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Firefly UML


A free, easy-to-use and user-friendly Java-based UML editor.

5.0 Stars (2)
2 Downloads (This Week)
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Firefly UML is a 100% pure Java application designed to create and edit UML conform diagrams. With class diagrams, sequence and instance diagrams, Firefly UML provides a solid selection from the vast range of existing UML diagram types.
Firefly UML is really easy to learn as it provides you multiple ways of access to the same function - be it mouse action, hotkey, context menu or toolbar icon. And the best thing is: once you have learned how to handle one type of diagram, you also have learned how to deal with the other diagram types, because they all follow the exactly same user interaction patterns.
Besides being user-friendly, Firefly also offers powerful features which other free editors usually do not. For example, you can import your existing Java project into Firefly and generate nice-looking class diagrams within a matter of minutes. You can also go the other way around and export your model as skeleton Java code.

Firefly UML Web Site


  • Easy to learn and use
  • Tailor-made for Java developers who want quick diagrams for their code
  • Import existing Java projects and let Firefly do the work for you
  • Create and modify class models from scratch directly within Firefly
  • Export your models into skeleton Java code
  • Supports Class diagrams, Sequence diagrams and instance diagrams
  • Firefly enables you to share the same classes in multiple diagrams in your project - change one, and the others will update automatically
  • Project support enables you to keep your files together and quickly load previous projects
  • Fast and powerful custom rendering engine based on SWING


User Ratings

ease 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 0 / 5
features 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 0 / 5
design 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 0 / 5
support 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 0 / 5
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User Reviews

  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    Works, very small, no complaints.

    Posted 01/24/2013
  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    Great tool

    Posted 09/23/2012
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Additional Project Details

Intended Audience

Developers, Education, Science/Research

User Interface

Java Swing

Programming Language




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