astah.net

What It Is

Astah is a suite of modeling and diagramming tools from Change Vision, Inc., positioned for software development, business analysis, systems engineering, and safety engineering. Its product line includes Astah Professional, Astah UML, Astah SysML, and Astah System Safety, covering different levels of needs from lightweight UML diagramming to SysML and safety engineering analysis.

Core Capabilities

Based on the collected information, Astah Professional supports UML, ERD, requirement diagrams, flowcharts, DFD, and more. Astah UML is more focused on lightweight UML and mind maps, Astah SysML is aimed at systems engineering, and System Safety adds STAMP/STPA, ASAM SCDL, and GSN. For team scenarios, Professional, SysML, and System Safety mention project merge and comparison features, making it easier for multiple people to collaborate around the same model. In terms of ecosystem, the website highlights source code integration and a plugin library, but does not specify particular languages, frameworks, or API/SDK details.

Pricing and Licensing

Astah’s licensing system is fairly comprehensive, but also somewhat complex. Individuals can choose monthly, annual, or, for some products, perpetual licenses. For example, Professional costs $11.99/month, $129.99/year, or $279 for a perpetual license, while UML costs $6.99/month or $79.99/year. SysML and System Safety are mainly annual subscriptions, at around $140/year and $550/year respectively. Team licensing includes organizational licenses, floating licenses, and team packs. Floating licenses require a self-hosted Reprise License Manager Server. Students can apply for a free personal Astah UML license with an academic email address, and departmental site licenses cost $900/year.

Pros and Cons

The advantages are its wide coverage of diagram types, clearly defined product editions, and support for individual, team, and educational use cases. Free trials and student licenses lower the barrier to entry. Team licensing provides bulk management, concurrent licensing, and project comparison/merge features, which are practical for traditional engineering teams. The drawbacks are that there are many licensing options, so buyers need to carefully distinguish between editions before purchasing; some floating licenses require a self-hosted license server; and the text does not show details on real-time cloud collaboration, APIs, SDKs, or specific programming language integrations.

Who It’s For and Access from China

Astah is suitable for software teams, systems engineers, safety engineers, and university teaching scenarios that require formal UML/SysML modeling. If you only need to draw diagrams occasionally, the overall system may feel a bit heavyweight. Access from mainland China cannot be determined from the collected text, so it is marked as unknown.