crt.guru vs Halo Security Attack Surface Discovery: side-by-side comparison (2026)

crt.guru: External TLS cert monitoring with expiry alerts, vuln scanning & compliance reports. Built by Crt.guru.

Halo Security Attack Surface Discovery: Discovers and inventories internet-facing assets including subdomains, IPs, and apps. Built by Halo Security.

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

crt.guru is made by Crt.guru. Halo Security Attack Surface Discovery is made by Halo Security. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Often, yes. crt.guru and Halo Security Attack Surface Discovery are both External Attack Surface Management products. Use the table above to see where features, deployment and company size fit differ.