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.
Other Popular Alternatives & Related Software
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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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 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 SysML
Astah SysML is a SysML v1 modeling tool for systems engineering and model-based systems engineering (MBSE), developed by Change Vision, Inc. It supports block definition, internal block, requirement, parametric, use case, state machine, activity, and sequence diagrams, plus requirement tables and mind maps.
Designs are stored as models, so a change to a block or requirement is reflected in every diagram that uses it. Profiles, XMI import/export, and data exchange with Cameo Systems Modeler are supported.
AI Chat Copilot works with your own API key for OpenAI, Azure OpenAI, Claude, Gemini, or an OpenAI-compatible service, and a local MCP server lets external AI agents work with your models.
Astah SysML runs on Windows and macOS. Simulation is not included. A 20-day free trial is available.
For SysML v2, Change Vision offers separate products that run as Visual Studio Code extensions: SysMLv2 Editor and SysMLv2 Modeler (early access).
Learn more about Astah SysML
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
SysMLv2 Editor Frequently Asked Questions
Q: What kinds of users and organization types does SysMLv2 Editor work with?
SysMLv2 Editor works with these users and organization types: Mid Size Business, Small Business, Enterprise, Freelance, Nonprofit, Government, and Startup.
Q: What languages does SysMLv2 Editor support in their product?
SysMLv2 Editor supports these languages: English and Japanese.
Q: What kind of support options does SysMLv2 Editor offer?
SysMLv2 Editor offers support via online.
Q: What other applications or services does SysMLv2 Editor integrate with?
SysMLv2 Editor integrates with: Visual Studio Code.
Q: What type of training does SysMLv2 Editor provide?
SysMLv2 Editor provides training in the form of documentation.
Q: Does SysMLv2 Editor offer a free trial?
Yes, SysMLv2 Editor offers a free trial.
Q: How much does SysMLv2 Editor cost?
Pricing for SysMLv2 Editor starts at Included with Astah SysML ($14.
Q: What pricing for support is available for SysMLv2 Editor?
SysMLv2 Editor offers support included with purchase.
Q: What pricing for training is available for SysMLv2 Editor?
SysMLv2 Editor offers training included with purchase.
