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What is Dia?

Dia is a cross-platform, open-source tool tailored for generating structured diagrams such as software architecture charts, database models, and engineering schematics. It supports shape-based drawing with a rich library of customizable symbols, and advanced users can extend its functionality using Python scripting. Available under the GNU GPLv2 license, Dia runs on Windows, Mac OS X, and Linux, making it a flexible option for users in varied environments. The application offers multilingual support, with over 60 languages integrated, and features such as rotating elements, importing custom shapes, and exporting in SVG and XML formats. The download packages are small, making installation quick and resource-efficient. The platform includes thorough documentation, shape creation guides, and a robust FAQ section. For community engagement and technical help, users can access mailing lists and bug trackers. Whether you're designing a basic org chart or a complex system layout, Dia delivers the tools to get the job done effectively.

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.

Media

Media

Integrations Supported

Integrations Supported

Azure OpenAI Service
Claude
Gemini
HTML
Java
OpenAI
Redmine

API Availability

API Availability

Has API

Pricing Information

Pricing not provided

Pricing Information

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

Supported Platforms

Windows
Mac
Linux

Supported Platforms

Windows
Mac
On-Prem
Linux

Customer Service / Support

Standard Support
Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub
On-Site Training

Training Options

Documentation Hub

Company Facts

Organization Name

The Dia Developers

Company Location

Germany

Company Website

dia-installer.de

Company Facts

Organization Name

Change Vision, Inc.

Date Founded

2006

Company Location

Tokyo, Japan

Company Website

astah.net/products/astah-uml/

Categories and Features

Diagram

Flowchart
Organizational Charting

Process Mapping

Not specified

Categories and Features

Diagram

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

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