Attack Surface Scan vs Cert Spotter: Side-by-Side Comparison (2026)

Attack Surface Scan: Agentless external attack surface monitoring with continuous change detection. built by Attack Surface Scan. Core capabilities include Agentless external attack surface scanning with no installation required, Continuous scheduled re-scanning with change detection and diff tracking, HTTP security header analysis (HSTS, CSP, CORS, cookie flags)..

Cert Spotter: A Certificate Transparency log monitor that alerts users when SSL/TLS certificates are issued for their domains, helping detect unauthorized certificate issuance and potential security threats..

Both serve the External Attack Surface Management market but differ in approach, feature depth, and target audience.

Attack Surface Scan is developed by Attack Surface Scan. Cert Spotter is open-source with 1,132 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Attack Surface Scan and Cert Spotter serve similar External Attack Surface Management use cases: both are External Attack Surface Management tools, both cover TLS, SSL, Alerting. Key differences: Attack Surface Scan is Commercial while Cert Spotter is Free, Cert Spotter is open-source. Review the feature comparison above to determine which fits your requirements.