# Astah

> Astah is a lightweight UML, SysML, and MBSE modeling tool suite by Change Vision, Inc.
> It supports UML 2.x, SysML 1.x and v2, GSN, STAMP/STPA, SCDL, and UAF, and includes
> AI-assisted modeling via AI Chat Copilot and an MCP Server for connecting external AI clients.

Product family: Astah Professional (UML + SysML + Mind Map), Astah UML, Astah SysML,
Astah System Safety (GSN / STAMP-STPA / SCDL / UAF), Astah SysML v2 Modeler,
Astah Viewer (free), Astah UML Pad (iOS). Astah Community is discontinued.

## AI integration
- [Astah MCP Server](https://astah.net/support/astah-mcp-servers/): Connect external AI clients (MCP-compatible) to Astah to read and edit models.
- [AI Chat Copilot](https://astah.net/support/ai-chat-copilot/): Describe a system in natural language and generate initial UML/SysML models inside Astah.
- [AI Chat Copilot Tools Reference](https://astah.net/support/ai-chat-copilot/chat-copilot-tools-reference/): Full list of tools the copilot can call.
- [Astah Pro MCP Plug-in](https://astah.net/product-plugins/astah-pro-mcp/): Plug-in that exposes Astah Professional over MCP.

## Products
- [Product overview](https://astah.net/products/): Which Astah edition fits which use case.
- [Astah Professional](https://astah.net/products/astah-professional/): UML 2.x, SysML, Mind Map, ER, flowchart; code reverse/generation for Java, C++, C#.
- [Astah UML](https://astah.net/products/astah-uml/): UML-only edition.
- [Astah SysML](https://astah.net/products/astah-sysml/): SysML 1.x modeling for systems engineering.
- [Astah System Safety](https://astah.net/products/astah-system-safety/): GSN, STAMP/STPA, SCDL, UAF for safety analysis and MBSE.
- [Astah SysML v2 Modeler](https://astah.net/products/sysmlv2-modeler/): Lightweight SysML v2 modeling environment.
- [SysML v2 Editor for VS Code](https://astah.net/products/sysml-v2-editor-for-visual-studio-code/): SysML v2 textual editing extension.
- [Astah Viewer](https://astah.net/products/astah-viewer/): Free viewer for .asta files.
- [Compare editions](https://astah.net/products/compare-editions/): Feature-by-feature comparison across editions.
- [Plug-ins and integrations](https://astah.net/products/plugins-integrations/): Jira, Confluence, code reverse, HTML export, and other plug-ins.

## Pricing and licensing
- [Pricing](https://astah.net/pricing/): Individual license prices per product (monthly / annual / perpetual, USD and EUR).
- [Team licenses](https://astah.net/pricing/team/): Floating and non-floating packs by seat count.
- [Academic licenses](https://astah.net/pricing/academic/): Student and faculty options.
- [Free student license](https://astah.net/products/free-student-license/)
- [Faculty site license](https://astah.net/products/faculty-site-license/)

## Documentation
- [Astah Professional user guide](https://astah.net/support/astah-pro/user-guide/): Per-diagram and per-feature how-to pages.
- [Astah Professional FAQs](https://astah.net/support/astah-pro/faqs/): Install, update, support renewal, troubleshooting.
- [SysML tutorials](https://astah.net/support/sysml/quick-sysml-tutorial-block-definition-diagram/)
- [System Safety documentation](https://astah.net/support/astah-system-safety/)
- [Modeling basics and best practices](https://astah.net/support/modeling-basics-best-practices/)
- [Astah API](https://astah.net/support/astah-api/): Java API for automation and plug-in development.
- [Version compatibility](https://astah.net/support/compatibility/): Which file formats and versions interoperate.
- [Plug-in development tutorial](https://astah.net/support/plugin-dev-tutorial/)
- [System requirements](https://astah.net/support/system-requirements/): Supported OS and Java versions per product and version.
- [Release notes](https://astah.net/support/release-notes/): Version history and per-version features.
- [How to run Astah on Linux](https://astah.net/support/how-to-run-astah-on-linux/)

## Modeling resources (concept explainers)
- [What is GSN](https://astah.net/products/astah-system-safety/gsn-goal-structuring-notation/)
- [Why do MBSE and SysML](https://astah.net/modeling-resources/why-do-mbse-and-sysml/)
- [UML class diagram basics](https://astah.net/modeling-resources/uml-class-diagram-basic/)
- [UML sequence diagram basics](https://astah.net/modeling-resources/uml-sequence-diagram-basic/)
- [UML use case diagram basics](https://astah.net/modeling-resources/uml-usecase-diagram-basic/)
- [SysML requirement table](https://astah.net/modeling-resources/sysml-requirement-table/)
- [SafeML introduction](https://astah.net/modeling-resources/safeml1-introduction/)
- [Visualizing safety cases](https://astah.net/modeling-resources/visualizing-safety-cases/)
- [UML history and myths](https://astah.net/modeling-resources/uml-history-and-myths/)

## Downloads and trials
- [Downloads](https://astah.net/downloads/): Installers and free trials (20-day, 40-day depending on edition).

## Optional
- [Blog](https://astahblog.com/): Release announcements, tips, and modeling articles.
- [Resellers](https://astah.net/astah-resellers/?_sfm_reseller_region=Europe)
- [Training and consulting partners](https://astah.net/training-consulting-partners/)
- [About Change Vision](https://astah.net/about/)