Cert Spotter vs SurfaceDiff: side-by-side comparison (2026)

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.

SurfaceDiff: Continuous external attack surface monitoring that shows what changed between scans. Built by SurfaceDiff.

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

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

Often, yes. Cert Spotter and SurfaceDiff are both External Attack Surface Management products, and both cover TLS, Alerting. Key differences: Cert Spotter is Free while SurfaceDiff is Commercial, Cert Spotter is open-source. Use the table above to see where features, deployment and company size fit differ.