Compatible with UML 2.x standard metamodel and diagrams: Class, Object, Use Case, Component, Deployment, Composite Structure, Sequence, Communication, Statechart, Activity and Profile Diagram.
Support to create Entity-Relationship Diagrams (ERD), Data-flow Diagrams (DFD) and Flowchart Diagrams.
Work with same UX in multiple platforms including macOS, Windows and Linux.
Supports Retina (High-DPI) Display. All diagrams, texts and icons are razor sharp and can be exported to High-DPI images (PNG and JPEG).
Easily discover and install third-party extensions. Many extensions are open source and hosted on Github. Fork one and make your own.
Modeling data are stored in a very simple JSON format, so it can be used easily to generate custom codes by user-defined templates (mdgen).
Supports many shorthands in Quick Edit to create elements and relationships at once such as sub-classes, supporting interfaces, etc.
Support light and darks themes, so you can choose a theme more comfortable.
StarUML checks latest updates automatically. No more manual download and installation.
Supports code generation and reverse engineering for major programming languages including Java, C#, and C++ via open source extensions.
Many model validation rules are defined and checked asynchronously whenever you save or open your model files.
Easy to share models with other analysts, archiects, and developers by just publishing HTML Docs.
Diagrams can be exported to PDF for clean printing with printing options like page layout and sizes.
Use markdown syntax to edit element's documentation with support of syntax highlighting and preview.