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.

The table above shows where their features, integrations, deployment and company size fit differ.

Findomain is open-source with 3,561 GitHub stars. SurfaceDiff is made by SurfaceDiff. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Often, yes. Findomain and SurfaceDiff are both External Attack Surface Management products, and both cover Port Scanning, Subdomain Enumeration, Reconnaissance. Key differences: Findomain is Free while SurfaceDiff is Commercial, Findomain is open-source. Use the table above to see where features, deployment and company size fit differ.