crt.guru vs S3BucketList: side-by-side comparison (2026)
crt.guru is a commercial external attack surface management solution by Crt.guru. S3BucketList is a free external attack surface management solution. Features, integrations, deployment and the company behind each one, side by side.
External TLS cert monitoring with expiry alerts, vuln scanning & compliance reports.
A Chrome extension that automatically detects and lists Amazon S3 buckets while browsing websites.
Side-by-side comparison
Feature
crt.guru
S3BucketList
Pricing model
Commercial
Free
Category
External Attack Surface Management
External Attack Surface Management
Deployment and fit
Deployment type
Cloud
Cloud
Company size fit
Startup, SMB, Mid-Market, Enterprise
Startup, SMB, Mid-Market, Enterprise
Open source
GitHub stars
–
124
Last commit
–
Aug 2025
Company
Company
Crt.guru
–
Use cases and capabilities
TLS
Yes
No
SSL
Yes
No
PCI DSS
Yes
No
NIST
Yes
No
Security Scanning
Yes
No
Alerting
Yes
No
Security Compliance Training
Yes
No
Security Reporting
Yes
No
Vulnerability
Yes
No
REST API
Yes
No
Enumeration
No
Yes
Browser Security
No
Yes
Reconnaissance
No
Yes
S3
No
Yes
AWS
No
Yes
Core features
10 features listed
No features listed
Integrations
4 integrations listed
No integrations listed
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