ctlogs.dev vs Microsoft Defender EASM: Side-by-Side Comparison (2026)

ctlogs.dev: Fast Certificate Transparency search and JSON API for subdomain reconnaissance. built by Apps34. Core capabilities include Real-time Certificate Transparency Search, Automated Subdomain Enumeration, High-Performance REST JSON API..

Microsoft Defender EASM: Discovers and monitors external-facing assets and vulnerabilities. built by Microsoft..

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

ctlogs.dev is developed by Apps34. Microsoft Defender EASM is developed by Microsoft. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

ctlogs.dev and Microsoft Defender EASM serve similar External Attack Surface Management use cases: both are External Attack Surface Management tools. Review the feature comparison above to determine which fits your requirements.