Attack Surface Scan vs crt.guru: 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)..

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)..

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

Attack Surface Scan differentiates with 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). 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).

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

Attack Surface Scan integrates with Slack, Claude, Claude Code, ChatGPT, Codex and 4 more. crt.guru integrates with Email, Telegram, Discord, Slack. Check integration compatibility with your existing security stack before deciding.

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