OWASP Threat Dragon review
A free, flexible choice for diagram-based threat modeling across web and desktop.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
OWASP Threat Dragon is a free, open-source application for creating data-flow diagrams, documenting threats, and recording remediations or countermeasures. It suits security teams, developers, and architects that want a diagram-based threat modeling workflow without a paid license. Web and desktop variants support work across Windows, macOS, and Linux, while self-hosted deployment is available for teams that want to manage the web application themselves.
The Free plan includes the complete published product scope: an open-source threat modeling application with diagram editing, threat records, severity and score fields, status and mitigation fields, PDF reports, and reusable templates. Threat categorization supports STRIDE, LINDDUN, CIA, CIA-DIE, and PLOT4ai. Threat suggestions can be generated by element type and context, giving teams a structured starting point for reviewing diagrams. The product is a strong fit when the core requirement is documenting threats and prioritizing individual findings within a model.
Its ecosystem supports storage through GitHub, GitHub Enterprise, GitLab, Bitbucket, Bitbucket Enterprise, and Google Drive, alongside local files. That range fits teams already organizing engineering or security artifacts in repositories and drive-based workflows. The main boundary is its diagram-centered approach: verified attack-path analysis is not part of the documented capability set, and collaborative review is less explicit than the storage integrations. Choose OWASP Threat Dragon for free, open-source modeling with multiple methods and portable deployment options; consider another tool when attack-path analysis or clearly defined collaborative review workflows are central requirements.
OWASP Threat Dragon pros and cons
- Where it wins
- Supports STRIDE, LINDDUN, CIA, CIA-DIE, and PLOT4ai
- Stores models through repositories, Google Drive, or local files
- Runs on web, Windows, macOS, Linux, and self-hosted deployments
- Where it doesn't
- Does not provide verified attack-path analysis
- Collaborative review support is less explicit
- Threat modeling centers on diagrams and recorded mitigations
OWASP Threat Dragon fact sheet, pricing and score →
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