Audience
Software developers, students, and teams who create UML diagrams for software design
About Astah UML
Astah UML is a UML 2.x diagramming tool for software design, developed by Change Vision, Inc. It covers the core UML diagrams, including class, use case, sequence, activity, state machine, component, and deployment diagrams, plus mind maps.
Astah creates models rather than drawings: when you change a model element, every diagram that uses it is updated, so your design stays consistent.
AI features include AI Chat Copilot and AI-assisted code reverse engineering, which use your own API key for OpenAI, Azure OpenAI, Claude, Gemini, or an OpenAI-compatible service. A local MCP server lets external AI agents work with your Astah models. Conventional reverse engineering of Java, C#, and C++ code is also included.
Astah UML runs on Windows, macOS, and Linux with a bundled Java runtime. A free license is available for students, and a 20-day free trial is available.
Latest version: 12.0 (released July 15, 2026).
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SysMLv2 Editor
SysMLv2 Editor is a Visual Studio Code extension from Change Vision, Inc. for writing SysML v2 models in the standard textual notation. Models are saved as plain-text .sysml files in your VS Code workspace.
Features include syntax highlighting, real-time detection of syntax and spelling errors, jump to definition and reference navigation, an outline view for a structural overview, and automatic diagram generation from the text.
SysMLv2 Editor runs on Windows, macOS, and Linux. It is included at no extra cost with a valid Astah SysML, Astah System Safety, or Astah Faculty Site License, and it stays available while that license is valid. A 20-day free trial is available. It is not data-compatible with Astah products, so it does not open SysML v1 models created in Astah SysML.
Learn more about SysMLv2 Editor
Astah SysML
Astah SysML is a SysML v1 modeling tool for systems engineering and model-based systems engineering (MBSE), developed by Change Vision, Inc. It supports block definition, internal block, requirement, parametric, use case, state machine, activity, and sequence diagrams, plus requirement tables and mind maps.
Designs are stored as models, so a change to a block or requirement is reflected in every diagram that uses it. Profiles, XMI import/export, and data exchange with Cameo Systems Modeler are supported.
AI Chat Copilot works with your own API key for OpenAI, Azure OpenAI, Claude, Gemini, or an OpenAI-compatible service, and a local MCP server lets external AI agents work with your models.
Astah SysML runs on Windows and macOS. Simulation is not included. A 20-day free trial is available.
For SysML v2, Change Vision offers separate products that run as Visual Studio Code extensions: SysMLv2 Editor and SysMLv2 Modeler (early access).
Learn more about Astah SysML
Lucidchart
Lucidchart is an advanced diagramming tool designed to help businesses and teams optimize their processes, systems, and workflows with intelligent, data-driven diagrams. The platform combines powerful AI features, such as AI-generated diagrams, data linking, and real-time collaboration, to make visualizing complex systems and architectures faster and more efficient. Lucidchart supports multiple use cases, including process maps, flowcharts, technical diagrams, organizational charts, and systems planning. Its seamless integrations with popular apps like Jira, Confluence, Slack, and Teams allow for enhanced collaboration, enabling teams to align on priorities and act on insights quickly. Lucidchart is the perfect tool for anyone looking to create professional diagrams in less time, while fostering better decision-making and innovation.
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Astah Professional
Astah Professional is an all-in-one modeling tool for software and system design, developed by Change Vision, Inc. It supports UML 2.x, ER diagrams, data flow diagrams (DFD), flowcharts, requirement diagrams, CRUD, and mind maps in a single tool.
Unlike drawing tools, Astah creates models: a change to a model element is reflected in every diagram that uses it, so your diagrams stay consistent.
AI features include AI Chat Copilot and AI-assisted code reverse engineering, which use your own API key for OpenAI, Azure OpenAI, Claude, Gemini, or an OpenAI-compatible service. A local MCP server lets external AI agents work with your Astah models. Conventional reverse engineering of Java, C#, and C++ code is also included.
Astah Professional is a desktop application for Windows, macOS, and Linux, with a bundled Java runtime, so no separate Java installation is required. A 20-day free trial is available.
Latest version: 12.0 (released July 15, 2026).
Learn more about Astah Professional
Pricing
Starting Price:
$6.99 per month
Pricing Details:
Plans from $6.99 per month. Free license for students. 20-day free trial.
Free Trial:
Free Trial available.
Company Information
Change Vision, Inc.
Founded: 2006
Tokyo, Japan
astah.net/products/astah-uml/
Videos and Screen Captures
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Product Details
Platforms Supported
Windows
Mac
Linux
On-Premises
Training
Documentation
Videos
Support
Online
Astah UML Frequently Asked Questions
Q: What kinds of users and organization types does Astah UML work with?
Astah UML works with these users and organization types: Mid Size Business, Small Business, Enterprise, Freelance, Nonprofit, Government, and Startup.
Q: What languages does Astah UML support in their product?
Astah UML supports these languages: English and Japanese.
Q: What kind of support options does Astah UML offer?
Astah UML offers support via online.
Q: What other applications or services does Astah UML integrate with?
Astah UML integrates with: Azure OpenAI Service, Claude Duet, Claude for Legal, Claude, Gemini, HTML, Java, OpenAI, and Redmine.
Q: Does Astah UML have an API?
Yes, Astah UML has an API.
Q: What type of training does Astah UML provide?
Astah UML provides training in the form of documentation and videos.
Q: Does Astah UML offer a free trial?
Yes, Astah UML offers a free trial.
Q: How much does Astah UML cost?
Pricing for Astah UML starts at $6.99 per month.
Q: What pricing for support is available for Astah UML?
Astah UML offers support included with purchase.
Q: What pricing for training is available for Astah UML?
Astah UML offers training included with purchase.
Astah UML Product Features
Diagram
Data Import / Export
Supported
Drag & Drop
Supported
For Developers
Supported
Mind Map
Supported
Templates
Supported
Flowchart
Not Supported
Multi-User Collaboration
Not Supported
Organizational Charting
Not Supported
