Quad9 vs Snort Open Source: side-by-side comparison (2026)
Quad9 is a free intrusion detection and prevention systems solution. Snort Open Source is a commercial intrusion detection and prevention systems solution by Cisco. Features, integrations, deployment and the company behind each one, side by side.
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A free DNS recursive service that blocks malicious host names and protects user privacy.
Snort is an open-source network intrusion detection and prevention system that analyzes traffic in real-time to identify and block malicious activity using rule-based detection methods.
Side-by-side comparison
Feature
Quad9
Snort Open Source
Pricing model
Free
Commercial
Category
Intrusion Detection and Prevention Systems
Intrusion Detection and Prevention Systems
Deployment and fit
Deployment type
Cloud
On-Premises
Company size fit
Startup, SMB, Mid-Market, Enterprise
Startup, SMB, Mid-Market, Enterprise
Company
Company
–
Cisco
Use cases and capabilities
DNS Security
Yes
No
Packet Analysis
No
Yes
Packet Capture
No
Yes
Open Source
No
Yes
Core features
10 features listed
No features listed
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