The Best UML Diagramming Tool Available

When UML modeling drives your development process, you need a tool that is specifically designed for UML and will give you all the features you need – without being too complicated. That’s Astah UML. A simple to learn, simple to use tool, Astah UML will allow you to create the UML diagrams you need.

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Astah UML v9.0 Released!

FlatUI, dark mode, and diagram thumbnails are now available!

Check Out Release Notes Now

Modern UML Diagramming

Designed with UML 2.x in Mind.

Astah is even faster than Excel or non-UML specific drawing tools. And our software will allow you to create a set of UML 2.x diagrams for your project, including:

Class diagrams

UseCase diagrams

Statemachine diagrams

Activity diagrams

Sequence diagrams

Communication diagrams

Component diagrams

Deployment diagrams

Composite Structure diagrams

Mindmaps

Supported UML Diagrams

Powerfully Easy

Work quickly and efficiently with assist functions.

We’ve been incorporating user feedback for more than 10 years. The result is a powerful software program that is incredibly easy to use and learn. Astah UML offers a variety of “assist” functions to make your work faster, including:

Auto-create class diagrams

Alignment guides

Copy to MS Office documents

Auto-layout

Customize shortcut keys

Gap expander/remover

Map view

Merge project files

Search and replace

Show related classes/models

State transition path & table

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Make it Your Own

Big library of plug-ins & integrations.

Need a feature that’s not included out of the box? No problem! Thanks to the Friends of Astah and our own extensive library of plug-ins and integrations, Astah UML can be customized to do what you need. Plug-ins are available for code generation, reverse engineering code, exporting, usability, and more. In addition, Astah UML integrates with Atlassian’s Confluence, yUML and Freemind.

Expand the power with our API.

The Astah API enables you to obtain Astah model information, create and modify diagrams and models, and use them in application software. With our API guide, you can also create your own plug-in and submit it to our library!

Go Above & Beyond

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Reverse engineer or generate code

Bring your model to life by generating code directly from your diagram with our code generation tools. Or work backwards and reverse engineer your project to create a model. Astah UML supports reverse engineering of Java, C#, and C++.

Import and export

Modeling is an amazing means of communicating your ideas, but you may need to get that information out of Astah UML and into the hands of your colleagues. With Astah UML, you can export diagrams to a variety of formats, including image files (jpg, png, emf, and svg), RTF documents, and HTML. You can also copy and paste into Microsoft Office documents and print with customized settings.

Want More? Go Pro!

Astah UML is a powerful tool in its own right, especially when you’re a student, working independently, or just getting started with modeling. However, if you want more functions, consider upgrading to Astah Pro. It offers all the features of Astah UML plus more!