ctlogs.dev vs SurfaceDiff: 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..

SurfaceDiff: Continuous external attack surface monitoring that shows what changed between scans. built by SurfaceDiff..

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

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

ctlogs.dev and SurfaceDiff serve similar External Attack Surface Management use cases: both are External Attack Surface Management tools, both cover DNS Security, TLS, Subdomain Enumeration. Review the feature comparison above to determine which fits your requirements.