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
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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.
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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.

Integrations

API:
Yes, Astah UML offers API access
See Integrations

Ratings/Reviews

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Company Information

Change Vision, Inc.
Founded: 2006
Tokyo, Japan
astah.net/products/astah-uml/

Videos and Screen Captures

Play Video Astah UML AI Chat Copilot Sequence Diagram in Astah UML UML use case diagram for an online shop in Astah Professional, with actors, a system boundary, and include and extend relationships.
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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

Astah UML Additional Categories

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