Cert Spotter vs ctlogs.dev: Side-by-Side Comparison (2026)

Cert Spotter: A Certificate Transparency log monitor that alerts users when SSL/TLS certificates are issued for their domains, helping detect unauthorized certificate issuance and potential security threats..

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..

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

Cert Spotter is open-source with 1,132 GitHub stars. ctlogs.dev is developed by Apps34. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Cert Spotter and ctlogs.dev serve similar External Attack Surface Management use cases: both are External Attack Surface Management tools, both cover SSL, TLS. Key differences: Cert Spotter is Free while ctlogs.dev is Commercial, Cert Spotter is open-source. Review the feature comparison above to determine which fits your requirements.