Subfinder vs SurfaceDiff: side-by-side comparison (2026)
Subfinder is a free external attack surface management solution. SurfaceDiff is a commercial external attack surface management solution by SurfaceDiff. Features, integrations, deployment and the company behind each one, side by side.
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Fast passive subdomain enumeration tool
Continuous external attack surface monitoring that shows what changed between scans.
Side-by-side comparison
Feature
Subfinder
SurfaceDiff
Pricing model
Free
Commercial
Category
External Attack Surface Management
External Attack Surface Management
Deployment and fit
Deployment type
On-Premises
Cloud
Company size fit
Startup, SMB, Mid-Market, Enterprise
Startup, SMB, Mid-Market, Enterprise
Open source
GitHub stars
12,248
–
Last commit
Aug 2025
–
Company
Company
–
SurfaceDiff
Use cases and capabilities
Subdomain Enumeration
Yes
Yes
DNS Security
No
Yes
Port Scanning
No
Yes
TLS
No
Yes
Network Scanning
No
Yes
Security Scanning
No
Yes
Alerting
No
Yes
Reconnaissance
No
Yes
Visibility
No
Yes
Web Security
No
Yes
Core features
No features listed
9 features listed
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