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Knock is a free external attack surface management tool. Matos Automated Attack Surface Management is a commercial external attack surface management tool by CloudMatos. Compare features, ratings, integrations, and community reviews side by side to find the best external attack surface management fit for your security stack.
Based on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:
Security teams doing external attack surface reconnaissance on a budget should start with Knock; it's free, it works, and the 4,054 GitHub stars reflect actual adoption rather than marketing hype. The tool excels at the narrow job of subdomain enumeration, which maps NIST Govern and Identify functions by forcing you to know what's actually exposed before you can defend it. Skip Knock if you need continuous monitoring or API integration into your existing ASM stack; this is a point-in-time scanner you run manually, not a platform that feeds ongoing discovery into your risk register.
Matos Automated Attack Surface Management
Startups and SMBs with sprawling multi-cloud footprints should pick Matos Automated Attack Surface Management because it finds shadow assets and orphaned infrastructure that your teams don't know exist, without requiring agents or manual tuning. The continuous discovery engine covers ID.AM (asset inventory) and DE.CM (anomaly detection) simultaneously, meaning you get both visibility and active monitoring from one deployment. Skip this if you need deep vulnerability correlation across on-premises datacenters; Matos is cloud-native by design and will feel limited in hybrid environments with heavy legacy infrastructure.
A subdomain scan tool that helps you find subdomains of a given domain.
Automated ASM tool for multi-cloud environments with continuous asset discovery
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Common questions about comparing Knock vs Matos Automated Attack Surface Management for your external attack surface management needs.
Knock: A subdomain scan tool that helps you find subdomains of a given domain..
Matos Automated Attack Surface Management: Automated ASM tool for multi-cloud environments with continuous asset discovery. built by CloudMatos. headquartered in United States. Core capabilities include Continuous discovery of internet-facing assets, Automated scanning of domains and IP addresses, CVE and configuration gap detection..
Both serve the External Attack Surface Management market but differ in approach, feature depth, and target audience.
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