crt.guru is a commercial external attack surface management solution by Crt.guru. Microsoft Defender EASM is a commercial external attack surface management solution by Microsoft. Features, integrations, deployment and the company behind each one, side by side.
What our shortlists say about the one we picked.
Best for: Microsoft shops adding external asset discovery
It belongs here if you already pay for Microsoft security, because discovered assets can move into Defender for Cloud and Copilot in Azure turns plain questions into inventory searches. It fits companies from small to enterprise. Its features center on discovery and flagging, so ask whether you also need active testing to prove which exposures are real.
From Best Attack Surface Management Solutions for Business, Fall 2026
Reviewed by Nika (Nikoloz) Kokhreidze.
External TLS cert monitoring with expiry alerts, vuln scanning & compliance reports.
Discovers and monitors external-facing assets and vulnerabilities
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Based on what each listing shows: deployment, company size, price and open source.
crt.guru fits if you are a startup.
Common questions when comparing crt.guru vs Microsoft Defender EASM for external attack surface management.
crt.guru: External TLS cert monitoring with expiry alerts, vuln scanning & compliance reports, built by Crt.guru.
Microsoft Defender EASM: Discovers and monitors external-facing assets and vulnerabilities, built by Microsoft.
The table above shows where their features, integrations, deployment and company size fit differ.
crt.guru is made by Crt.guru. Microsoft Defender EASM is made by Microsoft. 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 Microsoft Defender EASM are both External Attack Surface Management products. Use the table above to see where features, deployment and company size fit differ.
Need the answer fast? Best Attack Surface Management Solutions for Business picks Palo Alto Networks Cortex Xpanse, Microsoft Defender EASM, Mandiant Attack Surface Management and 4 more.See the shortlist