altdns is a free external attack surface management solution. DDactic Attack Surface Discovery is a commercial external attack surface management solution by DDactic. Features, integrations, deployment and the company behind each one, side by side.
A tool for generating permutations, alterations and mutations of subdomains and resolving them
Scans domains to discover attack surface, vulnerabilities, and generate hardening
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Based on what each listing shows: deployment, company size, price and open source.
altdns fits if you need to run it on your own servers, you need a free product and you want an open-source product.
DDactic Attack Surface Discovery fits if you want a cloud product.
Common questions when comparing altdns vs DDactic Attack Surface Discovery for external attack surface management.
altdns: A tool for generating permutations, alterations and mutations of subdomains and resolving them.
DDactic Attack Surface Discovery: Scans domains to discover attack surface, vulnerabilities, and generate hardening. Built by DDactic.
The table above shows where their features, integrations, deployment and company size fit differ.
altdns is open-source with 2,439 GitHub stars. DDactic Attack Surface Discovery is made by DDactic founded in 2026-01-01T00:00:00.000Z. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.
Often, yes. altdns and DDactic Attack Surface Discovery are both External Attack Surface Management products, and both cover Reconnaissance. Key differences: altdns is Free while DDactic Attack Surface Discovery is Commercial, altdns is open-source. Use the table above to see where features, deployment and company size fit differ.
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