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Description

Astah UML gives software teams and students a focused tool for UML 2.x modeling. Class, use case, sequence, activity, state machine, component, and deployment diagrams are all available, together with mind maps for early brainstorming. Every diagram is a view of a shared model, so renaming a class or changing a relationship updates it everywhere it appears. For AI-assisted work, Astah UML offers AI Chat Copilot and AI-assisted code reverse engineering, both of which connect to OpenAI, Azure OpenAI, Claude, Gemini, or any OpenAI-compatible endpoint through your own API key. A local MCP server lets external AI agents read and work with your models, and conventional reverse engineering turns existing Java, C#, and C++ code into diagrams without an AI service. Astah UML runs locally on Windows, macOS, and Linux. Developer: Change Vision, Inc. Current version: 12.0 (July 2026). Students can use it free of charge, and a 20-day trial is available for everyone else.

Description

Dia is a versatile and freely available diagram editor designed for creating technical drawings and structured charts like UML diagrams, flowcharts, and electrical circuits. It supports multiple operating systems including Windows, Linux, and Mac OS X, and provides customizable shapes through downloadable libraries. Users can also script functionalities using Python and access extensive documentation for guidance. Troubleshooting resources, bug tracking, and mailing lists are available for community-driven support. With support in over 60 languages and a lightweight installer, Dia is accessible to a global audience.

API Access

Has API Yes 

API Access

Has API No 

Screenshots View All

Screenshots View All

Integrations

Azure OpenAI Service Yes 
Claude Yes 
Gemini Yes 
HTML Yes 
Java Yes 
OpenAI Yes 
Redmine Yes 

Integrations

Azure OpenAI Service No 
Claude No 
Gemini No 
HTML No 
Java No 
OpenAI No 
Redmine No 

Pricing Details

$6.99 per month
Plans from $6.99 per month. Free license for students. 20-day free trial.
Free Trial Yes 
Free Version No 

Pricing Details

No price information available.
Free Trial No 
Free Version No 

Deployment

Web-Based No 
On-Premises Yes 
iPhone App No 
iPad App No 
Android App No 
Windows Yes 
Mac Yes 
Linux Yes 
Chromebook No 

Deployment

Web-Based No 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows Yes 
Mac Yes 
Linux Yes 
Chromebook No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Customer Support

Business Hours Yes 
Live Rep (24/7) No 
Online Support Yes 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person Yes 

Vendor Details

Company Name

Change Vision, Inc.

Founded

2006

Country

Japan

Website

astah.net/products/astah-uml/

Vendor Details

Company Name

The Dia Developers

Country

Germany

Website

dia-installer.de

Product Features

Diagram

Data Import / Export Yes 
Drag & Drop Yes 
Flowchart No 
For Developers Yes 
Mind Map Yes 
Multi-User Collaboration No 
Organizational Charting No 
Templates Yes 

Product Features

Diagram

Data Import / Export No 
Drag & Drop No 
Flowchart Yes 
For Developers No 
Mind Map No 
Multi-User Collaboration No 
Organizational Charting Yes 
Templates No 

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