crt.guru vs OWASP Amass: side-by-side comparison (2026)

crt.guru: External TLS cert monitoring with expiry alerts, vuln scanning & compliance reports, built by Crt.guru.

OWASP Amass: Performs network mapping of attack surfaces and external asset discovery using open source information gathering and active reconnaissance techniques.

The table above shows where their features, integrations, deployment and company size fit differ.

crt.guru is made by Crt.guru. OWASP Amass is open-source with 14,260 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Often, yes. crt.guru and OWASP Amass are both External Attack Surface Management products. Key differences: crt.guru is Commercial while OWASP Amass is Free, OWASP Amass is open-source. Use the table above to see where features, deployment and company size fit differ.