Findomain vs SurfaceDiff: Side-by-Side Comparison (2026)

Findomain: A domain reconnaissance tool that automates subdomain discovery, port scanning, and monitoring with support for multiple data sources and notification integrations..

SurfaceDiff: Continuous external attack surface monitoring that shows what changed between scans. built by SurfaceDiff. Core capabilities include Domain baseline scan for publicly exposed assets, Subdomain discovery, DNS record enumeration..

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

Findomain is open-source with 3,561 GitHub stars. 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.

Findomain and SurfaceDiff serve similar External Attack Surface Management use cases: both are External Attack Surface Management tools, both cover Port Scanning, Subdomain Enumeration, Reconnaissance. Key differences: Findomain is Free while SurfaceDiff is Commercial, Findomain is open-source. Review the feature comparison above to determine which fits your requirements.