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

Amass: Amass is an open-source OWASP tool for comprehensive attack surface mapping and asset discovery through domain reconnaissance and subdomain enumeration.

crt.sh: Bash script for subdomain enumeration via crt.sh certificate transparency logs.

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

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

Often, yes. Amass and crt.sh are both External Attack Surface Management products, and both cover Subdomain Enumeration, Reconnaissance, Open Source. Key differences: Amass is open-source. Use the table above to see where features, deployment and company size fit differ.