FestIn vs SurfaceDiff: side-by-side comparison (2026)

FestIn: FestIn discovers open S3 buckets associated with a domain using crawling and DNS reconnaissance techniques.

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.

FestIn is open-source with 230 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. FestIn and SurfaceDiff are both External Attack Surface Management products, and both cover DNS Security, Security Scanning, Reconnaissance. Key differences: FestIn is Free while SurfaceDiff is Commercial, FestIn is open-source. Use the table above to see where features, deployment and company size fit differ.