JetUML is a lightweight desktop application for quickly sketching software designs in UML. It deliberately concentrates on a small set of common diagram types rather than trying to provide a complete model-driven engineering environment.
Diagrams are stored in an open JSON representation and can be copied or exported for use in documentation and other applications. The interface includes automatic layout assistance and validation designed to keep diagram creation quick.
This is free and open source software.
Key Features
- Class diagrams.
- Sequence diagrams.
- State diagrams.
- Object diagrams.
- Use case diagrams.
- Automatic edge layout.
- Semantic validation of diagram elements.
- Open JSON-based diagram format.
- Export to PNG, JPEG and SVG.
- Clipboard integration.
- Customizable appearance including dark mode, fonts and grid settings.
- Reorderable diagram tabs.
Website: github.com/prmr/JetUML
Support:
Developer: Martin Robillard
License: GNU General Public License v3.0

JetUML is written in Java. Learn Java with our recommended free books and free tutorials.
Related Software
| Unified Modeling Language tools | |
|---|---|
| Eclipse Papyrus | Edit models based on UML and related languages |
| PlantUML | Draw UML diagrams from simple textual description |
| Mermaid | Generate diagrams from markdown-like text |
| Umple | Create UML models textually |
| Modelio | UML and BPMN modeling environment |
| Gaphor | Simple UML and SysML modeling tool |
| Umbrello | UML Modeller based on KDE technology |
| UMLet | Java-based UML tool |
| JetUML | Sketch software design ideas with a minimum of fuss |
| Violet | Designed for people who need to produce simple UML diagrams |
| Dia | GTK+ based diagram creation software |
| ArgoUML | UML modeling tool |
| crystal-facet-uml | Desktop UML and SysML modeling application |
| UML Designer | UML tool based on Sirius and Eclipse |
Read our verdict in the software roundup.
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