Free Threat Modeling Tools
Threat modeling tools help you map a system, work out how it could be attacked, and decide which risks to design out first. The free tools listed here let startup teams run structured threat models on new features without specialist tooling.
- 9 free solutions listed
- Free for startups & SMBs
- Curated by certified experts
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CAIRIS
Threat ModelingAN OPEN-SOURCE PLATFORM FOR BUILDING SECURITY AND USABILITY INTO YOUR SOFTWARE. MANAGE YOUR SECURITY, USABILITY, AND DESIGN ARTIFACTS IN ONE PLACE. From assets to countermeasures, factoids to personas, and requirements to architectural components.
IriusRisk
Threat ModelingExplore our powerful, scalable, and collaborative threat modeling platform - designed to help you start left, save time, avoid delays, and design secure applications. Define your architecture: Draw a diagram using drag and drop components, powered by our embedded draw.io diagramming tool, or answer our embedded questionnaires to define your application architecture.
securiCAD Professional
Threat ModelingSingle user, manual modeling app. For security architects where manual modeling is key but automation, collaboration & UI are secondary. securiCAD Professional enables risk and IT security architects to design virtual models of current and future IT infrastructures.
Threagile
Threat ModelingThreagile enables teams to execute Agile Threat Modeling as seamlessly as possible, even highly integrated into DevSecOps environments. Threagile is the open-source toolkit that allows modeling architecture with its assets in an agile declarative fashion as a YAML file directly inside the IDE or any YAML editor.
ThreatModeler
Threat ModelingAn automated threat modeling solution that secures and scales the enterprise software development life cycle. ThreatModeler’s “Accelerator” does the heavy lifting with automated cloud threat modeling. With one click automatically: map, diagram & threat model AWS & Azure environments. Within minutes, Accelerator analyzes the live cloud environment, builds a detailed visual representation, analyze the security posture, recommends mitigations and validates security requirements.
Tutamen Threat Model Automator
Threat ModelingDiscover and mitigate Security Threats early during software design. Ease of use, common taxonomies, flexible output. It's all here. The Tutamen Threat Model Automator is designed to enable security at the architectural stage, where the cost of fixing flaws is the lowest. Reduce human error and inconsistencies with a single input of variables.
OWASP Threat Dragon
Threat ModelingThreat Dragon is an open-source threat modeling tool from OWASP. It is used both as a web application and as a desktop application installed for macOS, Windows, and Linux. The desktop application saves your threat models on your local file system, and the online version stores its files in GitHub.
Trike
Threat ModelingTrike is a platform-independent tool for systematic, computer-assisted threat modeling, from requirements through deployment. We are developing Trike v2 on GitHub (https://github.com/octotrike/trike). Our mailing lists are still here on SourceForge, and we're leaving the old code repository & releases up for archival purposes.
Microsoft Threat Modeling Tool
Threat ModelingThe Threat Modeling Tool is a core element of the Microsoft Security Development Lifecycle (SDL). It allows software architects to identify and mitigate potential security issues early, when they are relatively easy and cost-effective to resolve. As a result, it greatly reduces the total cost of development.
What Threat Modeling Tools Do
Threat modeling tools help you work out, before code is written or a system is deployed, what could go wrong and what you will do about it. They provide diagramming of data flows and trust boundaries, libraries of threats organised by method (STRIDE, attack trees, MITRE ATT&CK), and a way to record the mitigations so the design decision is traceable later.
For a SaaS team threat modeling is the cheapest security activity there is: an hour at design time avoids weeks of rework after a penetration test. The free tools on this page range from structured diagramming tools with built-in threat libraries to lightweight, developer-friendly threat modeling as code that lives in the repository beside the feature it protects.
How to Choose a Threat Modeling Tool
- Pick a tool your developers will actually open; a threat model in a tool nobody uses is worse than a whiteboard photo.
- Choose one with a threat library mapped to a recognised method (STRIDE or ATT&CK) so the analysis is consistent across teams.
- Prefer tools that export the model and mitigations as a document; auditors and customers ask for evidence of secure design.
- For agentic AI and LLM features, add a tool or checklist that covers prompt injection, data exfiltration, and tool misuse.
Need help with Threat Modeling?
IRM runs threat modeling workshops for SaaS products and agentic AI workflows.
Threat Modeling ServicesCheck your readiness first
Free, no signup, runs in your browser. Score your gaps and download a remediation roadmap.
Free AI Governance PlaybookThreat Modeling Tools: Frequently Asked Questions
What is STRIDE?
A method for enumerating threats by category: Spoofing, Tampering, Repudiation, Information disclosure, Denial of service, and Elevation of privilege. You walk each element of a data flow diagram through the six categories and record the threats and mitigations. It is the most widely used starting point and most free tools support it.
When should we threat model?
At the design stage of any new system or significant feature, when adding a new data type or integration, and when architecture changes. Revisit annually. Doing it before code exists is where the savings come from.
Is threat modeling required for SOC 2 or ISO 27001?
Both require secure development practices and risk assessment; threat modeling is the most direct evidence of both for a software product, and enterprise customers increasingly ask for it in security reviews.
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