Astah SysML

SysML Modeling Tool for Systems Engineering

Design complex systems faster with Astah SysML – a standards-compliant modeling tool for MBSE.
Trusted by leaders in aerospace, automotive, and embedded systems engineering.

NewCreate SysML diagrams from requirements with AI. See how →

What is Astah SysML?

Astah SysML is a powerful modeling tool based on the SysML standard, designed for Model-Based Systems Engineering (MBSE).
It enables teams to design, analyze, and document complex systems across domains such as aerospace, automotive, and embedded systems.

All the SysML Diagrams You Need

Astah SysML provides full support for all SysML diagram types, enabling precise, standards-compliant system modeling.

Included diagram types:

Block Definition Diagram (BDD)

Internal Block Diagram (IBD)

Parametric Diagram

Requirement Diagram

Requirement Table

Usecase Diagram

Activity Diagram

Statemachine Diagram

Sequence Diagram

MindMaps

AI-Powered Modeling

The power of AI, right inside your modeling environment

Describe your system or paste your requirements, and AI Chat Copilot creates SysML diagrams for you, right inside Astah SysML. You can also ask it to refine existing diagrams or explain complex structures in plain language.

Prefer to work from your AI coding agent? Connect Claude Code, GitHub Copilot or another AI client to Astah SysML through the built-in MCP server, and let it read and update your models.

AI Chat Copilot needs your own API key from a supported AI service, such as OpenAI, Claude or Gemini. The MCP server needs no API key in Astah, because your AI client uses its own account.

AI Chat Copilot turns a requirements table into a requirement diagram and a block definition diagram, then traces the requirements to the design. Edited to shorten waiting time.

See what you can do with AI →

Team Development

Compare and Merge Models

Astah SysML supports team modeling by letting multiple engineers work on the same project. Use the compare and merge feature to find the differences between two versions of a model file and integrate them. You can review the differences visually in side-by-side diagrams or in a detailed table, so you never miss a change.

Comparing two versions of a SysML project in Astah SysML

Model Smarter

Perfect for both new and advanced users

Astah SysML is packed with assistive features that accelerate your modeling. With auto-alignment guides, multi-object creation from text, and one-click actions, you can build professional diagrams quickly. Use the gap expander/remover to tidy layouts, and search and replace elements across the model.

Experienced systems architects can access the models with a scripting language.

Alignment guides while drawing SysML diagrams in Astah SysML

Interoperability

Works with Cameo Systems Modeler

Export the diagrams you create in Astah SysML to image formats (JPG, PNG, EMF, and SVG) and to XML formats compatible with Cameo Systems Modeler (formerly MagicDraw with the SysML plugin): OMG XMI 2.5 and MDXML. You can also import model data from Cameo Systems Modeler into Astah SysML using MDXML and MDZIP files.

Importing and exporting Cameo Systems Modeler files in Astah SysML

Endorsement

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.

— Dr. Richard Mark Soley, Former Chairman and CEO, Object Management Group, Inc.,

We honor the memory of Dr. Soley, who passed away in 2023.

Looking for SysML v2 Support?

Astah SysML currently supports SysML v1. For SysML v2, Change Vision offers SysMLv2 Editor for Visual Studio Code. It is included with every paid Astah SysML license at no additional cost.