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. 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.

FestIn is open-source with 230 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.

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