crt.sh vs SurfaceDiff: side-by-side comparison (2026)
crt.sh 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.
Bash script for subdomain enumeration via crt.sh certificate transparency logs.
Continuous external attack surface monitoring that shows what changed between scans.
Side-by-side comparison
Feature
crt.sh
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
Company
Company
–
SurfaceDiff
Use cases and capabilities
Subdomain Enumeration
Yes
Yes
Reconnaissance
Yes
Yes
Open Source
Yes
No
Bug Bounty
Yes
No
Enumeration
Yes
No
Network Reconnaissance
Yes
No
SSL
Yes
No
DNS Security
Yes
Yes
Security Scanning
Yes
Yes
Port Scanning
No
Yes
TLS
No
Yes
Network Scanning
No
Yes
Alerting
No
Yes
Visibility
No
Yes
Web Security
No
Yes
Core features
5 features listed
9 features listed
Integrations
1 integration listed
No integrations listed
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