s3viewer vs SurfaceDiff: side-by-side comparison (2026)
s3viewer 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.
A storage exploration tool that provides unified access to view publicly accessible Amazon S3 buckets, Azure Blob storage, FTP servers, and HTTP directory listings.
Continuous external attack surface monitoring that shows what changed between scans.
Side-by-side comparison
Feature
s3viewer
SurfaceDiff
Pricing model
Free
Commercial
Category
External Attack Surface Management
External Attack Surface Management
Deployment and fit
Deployment type
Cloud
Cloud
Company size fit
SMB, Mid-Market, Enterprise
Startup, SMB, Mid-Market, Enterprise
Open source
GitHub stars
448
–
Last commit
Jul 2023
–
Company
Company
–
SurfaceDiff
Use cases and capabilities
Azure
Yes
No
S3
Yes
No
AWS
Yes
No
Misconfiguration
Yes
No
DNS Security
No
Yes
Port Scanning
No
Yes
TLS
No
Yes
Subdomain Enumeration
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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