A sophisticated software modeler for agile and concise modeling

current version: v5.1.0

Key Features


Compatible with UML 2.x standard metamodel and diagrams: Class, Object, Use Case, Component, Deployment, Composite Structure, Sequence, Communication, Statechart, Activity, Timing, Interaction Overflow, Information Flow and Profile Diagram.

SysML Support

Support modeling with SysML diagrams: Requirement, Block Definition, Internal Block, and Parametric Diagram.

Additional Diagrams

Support to create Entity-Relationship Diagrams (ERD), Data-flow Diagrams (DFD) and Flowchart Diagrams.

Custom UML Profile

You can define your own UML Profile with stereotypes. Each stereotype can have custom icons.


Work with same UX in multiple platforms including MacOS, Windows and Linux.

Auto Update

StarUML checks latest updates and install automatically for MacOS and Windows.

Retina Display Support

Supports Retina (High-DPI) Display. All diagrams, texts and icons are razor sharp and can be exported to High-DPI images (PNG and JPEG).

Extension Manager

Easily discover and install third-party extensions. Many extensions are open source and hosted on Github. Fork one and make your own.

Model-Driven Development

Modeling data are stored in a very simple JSON format, so it can be used easily to generate custom codes with CLI (Command-Line Interface).

Fast Modeling

Supports many shorthands in Quick Edit to create elements and relationships at once such as sub-classes, supporting interfaces, etc.

Dark and Light Themes

Support light and darks themes, so you can choose a theme more comfortable.

Command Palette

Command Palette allows to search and execute commands in StarUML as well as installed extensions.

Code Generation

Supports code generation for various programming languages including Java, C#, C++ and Python via open source extensions.

Quick Find

Quick Find allows to find models, views and diagrams and select the element quickly.

Asynchronous Model Validation

Many model validation rules are defined and checked asynchronously whenever you save or open your model files.

Publish HTML Docs

Easy to share models with other analysts, architects, and developers by just publishing HTML Docs.

PDF Export for Clean Printing

Diagrams can be exported to PDF for clean printing with printing options like page layout and sizes.

Markdown Support

Use markdown syntax to edit element's documentation with support of syntax highlighting and preview.