Made SysML Diagramming Easy

Astah SysML is a lightweight SysML diagramming tool which is perfect for systems engineering. Our user-friendly tool helps create a clear understanding among business analysts, engineers, developers, and quality assurance specialists with Astah SysML.

Astah SysML
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Need XMI import/export?

If you need XMI support, integration with Cameo System Modeler or team collaboration features, you should try out Astah System Safety which offers more advanced SysML functionalities.


All the Diagrams You Need

Built for system engineering.

Astah SysML is built for system engineering, and gives you all the diagram types you need in one powerful tool. Diagram types include:

Requirement Diagram & Table

Block definition diagram (BDD)

Internal block diagram (IBD)

Parametric diagram

UseCase diagram

Statemachine diagram

Activity diagram

Sequence diagram


Supported SysML diagrams

The Power of Usability

Requirement Diagram Sample

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. Astah SysML offers a variety of “assist” functions to make your work faster, including:

Alignment guides


Clone models/diagrams

Customize shortcut keys


Jump from tree to diagram

Search and replace

Show related models

Requirement Diagram Sample

Customized & Personalized

Customize your layout and design elements.

Astah SysML offers “expressions” that help you customize your layout and design. This makes your working environment friendlier, and improves the clarity of communications. Expressions include use case descriptions, font settings, mini icons, highlighter/marker pens, and free-writing tools.

Extend tools 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 well-documented API, you can also create your own plug-in and submit it to our library!

Data Integration

Source Code Integration

Bring the Power of Models Outside the Software.

Export the diagrams you create in Astah SysML to a variety of formats, including image files such as jpg, png, emf, and svg. You can also copy and paste into Microsoft Office documents and print with customized settings.

Works with Robot Operating System.

Astah SysML works with the open source Robot Operating System (ROS) from Sugar Sweet Robotics so you can bring your model to life and develop robotic prototypes.


SysML is already the industry standard for engineering large, complex systems; more safety and quality system development teams are rapidly adopting the language every day. Now every engineering specialty, from mechanical, to electronic to software engineering have a common language to design safe, complex systems architectures. We are pleased to welcome Astah to the fold, a unique modeling tool from Japan, from Change Vision.