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What is Astah UML?

Astah UML is a desktop UML 2.x modeling application from Change Vision, Inc. It is designed for development teams, universities, and individual engineers who need standard UML diagrams without the complexity of a full systems-engineering suite. Because designs are stored as models, an update made in one place carries through to every related diagram, which keeps design documentation consistent as a project grows. Version 12.0, released in July 2026, brings AI into UML modeling. AI Chat Copilot and AI-assisted code reverse engineering run on your organization's own API key for OpenAI, Azure OpenAI, Claude, or Gemini, or for an OpenAI-compatible service. Local MCP server integration lets AI agents connect to Astah models. Plans start at $6.99 per month. A free license is available for students, and a 20-day free trial is offered. Astah UML runs on Windows, macOS, and Linux without a separate Java installation.

What is AltonaLab?

AltonaLab offers an Internet of Things (IoT) software platform that includes a user-friendly and powerful CAD environment, perfect for designing intricate diagrams. For a deeper understanding of the software, users are encouraged to delve into the detailed documentation available. To create a new connection, users need to click and hold the left mouse button on either an input or output of a block, drag it toward the corresponding input/output of another block, and then release the button at the desired location. Accessing the Parameters editor is straightforward; users can do this by double-clicking on a block or right-clicking it, leading to a display where each parameter is organized in individual rows. It's important to remember that the Name of each parameter must be unique within the diagram, as it significantly influences the overall dimensions. While the diagram is locked, the software utilizes this unique parameter to control the size, effectively hiding any blocks and contours that fall outside the confines of the visible area defined by LockedCanvasHeight and LockedCanvasWidth, ensuring that only relevant controls are presented. This feature not only improves the overall user experience but also facilitates a more efficient design process by reducing unnecessary visual distractions. Additionally, users can appreciate how this functionality contributes to a cleaner workspace, allowing for a clearer focus on the task at hand.

Media

Media

Integrations Supported

Azure OpenAI Service
Claude
Claude Duet
Claude for Legal
Gemini
HTML
Java
OpenAI
Redmine

Integrations Supported

API Availability

Has API

API Availability

Pricing Information

$6.99 per month
Plans from $6.99 per month. Free license for students. 20-day free trial.
Free Trial Offered?

Pricing Information

$50 one-time payment

Supported Platforms

Windows
Mac
On-Prem
Linux

Supported Platforms

Windows

Customer Service / Support

Web-Based Support

Customer Service / Support

Standard Support
Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub
On-Site Training

Company Facts

Organization Name

Change Vision, Inc.

Date Founded

2006

Company Location

Tokyo, Japan

Company Website

astah.net/products/astah-uml/

Company Facts

Organization Name

AltonaLab

Company Location

Bulgaria

Company Website

scada.altonalab.com

Categories and Features

Diagram

Data Import / Export
Drag & Drop
For Developers
Mind Map
Templates

Categories and Features

Diagram

Data Import / Export
Flowchart
For Developers

Industrial Automation

Not specified

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