Microsoft Threat Modeling Tool review
A free Windows STRIDE tool with diagrams, prioritization, templates, validation, and reports.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Microsoft Threat Modeling Tool is a free Windows application for developers, software architects, and security teams. It helps map software designs with data-flow diagrams, trust boundaries, and components, then generates threats using STRIDE categories and Microsoft’s SDL approach. Users can document justifications and mitigations, assign priorities and statuses, and create HTML reports. It is a focused choice for teams that want a structured threat-modeling workflow without a software license cost, particularly when Windows is already part of the working environment.
Its modeling depth is the main strength. Drawing guidance and validation messages support the diagramming process, while generated threats give teams a starting point for reviewing design risks. Threat properties can be edited to add context, record decisions, and track status. Microsoft includes Azure-specific and generic SDL templates, and users can create or modify custom templates for projects with different modeling conventions. This combination makes the tool more adaptable than a fixed checklist, while keeping the workflow organized around diagrams, trust boundaries, STRIDE, and prioritization.
Sharing and output support extend the workflow beyond the model itself. Models can be opened and shared through OneDrive, and HTML reports provide a format for communicating results. The trade-off is a narrow platform and workflow fit: the application is available for Windows, and its documented collaboration path is tied to OneDrive. Teams seeking broader platform coverage or a wider security-operations environment should consider an alternative. Choose Microsoft Threat Modeling Tool when free Windows-based STRIDE modeling, templates, validation, prioritization, and reporting are the priorities; look elsewhere when cross-platform access or a broader integration ecosystem matters more.
Microsoft Threat Modeling Tool pros and cons
- Where it wins
- Creates data-flow diagrams with trust boundaries and software components
- Generates, prioritizes, edits, and tracks STRIDE-based threats
- Supports SDL templates, custom templates, HTML reports, and OneDrive sharing
- Where it doesn't
- Windows-only access excludes teams working on other platforms
- OneDrive is the stated route for opening and sharing models
- The workflow is centered on threat modeling rather than broader security operations
Microsoft Threat Modeling Tool fact sheet, pricing and score →
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