Cert Spotter vs Siemba EASM: 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..

Siemba EASM: AI-driven EASM platform for discovering and monitoring external-facing assets. built by Siemba. Core capabilities include External asset discovery without credentials, Real-time monitoring of domains, subdomains, and IPs, TLS configuration and certificate vulnerability detection..

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

Cert Spotter is open-source with 1,132 GitHub stars. Siemba EASM is developed by Siemba. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

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