Threat Modeling
A STRIDE-per-element threat modeling wizard for design reviews. Models are stored only in your browser.
- Processes, data stores, external entities and data flows with trust boundaries
- Around 30 rules generate concrete threats with suggested mitigations
- Likelihood × impact risk rating, status, owner and ticket tracking
- Markdown report and Mermaid data-flow diagram export, JSON import/export
More free security tools
- Dev Toolbox: Decode and lint JWTs, evaluate Content-Security-Policy, grade HTTP security headers and cookies, encode/hash data and scan code for leaked secrets, all locally.
- Review Checklists: Run secure code reviews with OWASP Top 10:2025, API Security Top 10 and ASVS 5.0 checklists, record pass/fail with notes and paste the summary into your PR.
- Dependencies & CI: Check package-lock, yarn.lock, requirements.txt, pom.xml, go.sum and more against OSV.dev, and generate GitHub Actions for CodeQL, Dependabot, gitleaks and Trivy.
- Data Lab: Chain 100+ operations into recipes: Base64, hex, URL, AES-GCM, HMAC, PBKDF2, MD5/SHA, gzip, XOR brute force, IOC extraction and defanging, with Magic auto-detect.
- PKI Tools: Decode and lint X.509 certificates, chains, CSRs and CRLs, generate CSRs and keys, match keys to certificates, convert PEM/DER/P7B/JWK. Nothing is uploaded.
- AI Skill Scanner: Scan SKILL.md files, agent instructions, MCP server configs and Claude Code hooks for prompt injection, data exfiltration, hidden Unicode and dangerous commands.
- Website Recon: Passive recon for a domain: DNS records, SPF, DMARC, DKIM, CAA, DNSSEC, certificate transparency subdomains, RDAP registration, HSTS preload and archive history.
Source code on GitHub (open source).