crt.guru vs Siemba EASM: Side-by-Side Comparison (2026)

crt.guru: External TLS cert monitoring with expiry alerts, vuln scanning & compliance reports. built by crt.guru. Core capabilities include Multi-region external TLS scanning (Frankfurt, New York, Amsterdam), Certificate expiry alerts at 30, 14, 7, and 1 day intervals, Vulnerability scanning (Heartbleed, ROBOT, CCS Injection, weak ciphers)..

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.

crt.guru differentiates with Multi-region external TLS scanning (Frankfurt, New York, Amsterdam), Certificate expiry alerts at 30, 14, 7, and 1 day intervals, Vulnerability scanning (Heartbleed, ROBOT, CCS Injection, weak ciphers). Siemba EASM differentiates with External asset discovery without credentials, Real-time monitoring of domains, subdomains, and IPs, TLS configuration and certificate vulnerability detection.

crt.guru is developed by crt.guru. 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.

crt.guru and Siemba EASM serve similar External Attack Surface Management use cases: both are External Attack Surface Management tools, both cover TLS. Review the feature comparison above to determine which fits your requirements.