crt.guru vs DNS Assistant: 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)..

DNS Assistant: DNS posture mgmt platform for real-time DNS & WHOIS change monitoring. built by DNS Assistant. Core capabilities include Real-time DNS record monitoring (15+ record types including DNSSEC), DNSSEC chain-of-trust validation and signature expiry alerting, WHOIS monitoring for registration changes, expiration, and ownership transfers..

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). DNS Assistant differentiates with Real-time DNS record monitoring (15+ record types including DNSSEC), DNSSEC chain-of-trust validation and signature expiry alerting, WHOIS monitoring for registration changes, expiration, and ownership transfers.

crt.guru is developed by Crt.guru. DNS Assistant is developed by DNS Assistant founded in 2025-01-01T00:00:00.000Z. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

crt.guru integrates with Email, Telegram, Discord, Slack. DNS Assistant integrates with Slack, Microsoft Teams, web hook. Check integration compatibility with your existing security stack before deciding.

crt.guru and DNS Assistant serve similar External Attack Surface Management use cases: both are External Attack Surface Management tools, both cover Alerting, REST API. Review the feature comparison above to determine which fits your requirements.