Audience
Systems engineers and teams who write SysML v2 models as text in Visual Studio Code and manage them in Git
About SysMLv2 Editor
SysMLv2 Editor is a Visual Studio Code extension from Change Vision, Inc. for writing SysML v2 models in the standard textual notation. Models are saved as plain-text .sysml files in your VS Code workspace.
Features include syntax highlighting, real-time detection of syntax and spelling errors, jump to definition and reference navigation, an outline view for a structural overview, and automatic diagram generation from the text.
SysMLv2 Editor runs on Windows, macOS, and Linux. It is included at no extra cost with a valid Astah SysML, Astah System Safety, or Astah Faculty Site License, and it stays available while that license is valid. A 20-day free trial is available. It is not data-compatible with Astah products, so it does not open SysML v1 models created in Astah SysML.
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Syndeia
A Digital Thread is a graph whose nodes are elements in various enterprise repositories, tools, and version control systems, and whose edges are intra-model relationships within each tool and inter-model relationships created and managed by Syndeia between the nodes. Syndeia provides model transformation services to build the digital thread graph, such as drag-n-drop requirements from Jama or DOORS-NG to SysML, generate Simulink models and PLM part structures from SysML models, connect behavior elements in SysML to software code in GitHub, or track the development status of a sub-system in JIRA directly from SysML. Syndeia provides services to search, compare, and bi-directionally synchronize connected models in the digital thread, such as compare and sync changes in system architecture to PLM part structure, compare connected SysML and Simulink models, or sync changes in DOORS-NG requirements to SysML.
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Astah UML
Astah UML is a UML 2.x diagramming tool for software design, developed by Change Vision, Inc. It covers the core UML diagrams, including class, use case, sequence, activity, state machine, component, and deployment diagrams, plus mind maps.
Astah creates models rather than drawings: when you change a model element, every diagram that uses it is updated, so your design stays consistent.
AI features include AI Chat Copilot and AI-assisted code reverse engineering, which use your own API key for OpenAI, Azure OpenAI, Claude, Gemini, or an OpenAI-compatible service. A local MCP server lets external AI agents work with your Astah models. Conventional reverse engineering of Java, C#, and C++ code is also included.
Astah UML runs on Windows, macOS, and Linux with a bundled Java runtime. A free license is available for students, and a 20-day free trial is available.
Latest version: 12.0 (released July 15, 2026).
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Astah Professional
Astah Professional is an all-in-one modeling tool for software and system design, developed by Change Vision, Inc. It supports UML 2.x, ER diagrams, data flow diagrams (DFD), flowcharts, requirement diagrams, CRUD, and mind maps in a single tool.
Unlike drawing tools, Astah creates models: a change to a model element is reflected in every diagram that uses it, so your diagrams stay consistent.
AI features include AI Chat Copilot and AI-assisted code reverse engineering, which use your own API key for OpenAI, Azure OpenAI, Claude, Gemini, or an OpenAI-compatible service. A local MCP server lets external AI agents work with your Astah models. Conventional reverse engineering of Java, C#, and C++ code is also included.
Astah Professional is a desktop application for Windows, macOS, and Linux, with a bundled Java runtime, so no separate Java installation is required. A 20-day free trial is available.
Latest version: 12.0 (released July 15, 2026).
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Astah System Safety
Astah System Safety is a model-based safety analysis tool for safety-critical systems, developed by Change Vision, Inc. It combines SysML modeling with STAMP/STPA hazard analysis, GSN/D-Case assurance cases, ASAM SCDL safety concepts, and UAF in one tool.
Safety analyses are linked to the system model, so control structures, hazards, and safety arguments stay traceable to requirements and architecture. Safety engineers in automotive, aerospace, railway, and embedded systems use it to build safety cases for standards such as ISO 26262.
AI Chat Copilot and a local MCP server require your own API key from a supported AI service (OpenAI, Claude, Gemini, or an OpenAI-compatible endpoint). SysML models can be exchanged with Cameo Systems Modeler through XMI import and export.
Runs on Windows and macOS. FTA, FMEA, and simulation are not included. A 40-day free trial is available.
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Pricing
Starting Price:
Included with Astah SysML ($14
Pricing Details:
SysMLv2 Editor is not sold separately. It is included at no extra cost with a valid Astah SysML license (from $140 per user per year), Astah System Safety license (from $550 per user per year), or Astah Faculty Site License, and it can be used while that license is valid. A 20-day free trial is available after installing the extension from the Visual Studio Code Marketplace. On macOS, Astah SysML must be installed and launched first.
Free Trial:
Free Trial available.
Integrations
Company Information
Change Vision, Inc.
Founded: 2006
Tokyo, Japan
astah.net/products/sysmlv2-editor/
Videos and Screen Captures
SysML v2 textual model in Visual Studio Code with SysMLv2 Editor, showing syntax highlighting alongside a diagram generated automatically from the text.
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Product Details
Platforms Supported
Windows
Mac
Linux
On-Premises
Training
Documentation
Support
Online
