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Detectify vs Nessus: catalog facts
Detectify	Nessus
Paid Commercial service with a trial available; pricing is aimed at organisations.	Freemium Nessus Essentials is free for up to sixteen IP addresses. Professional is a paid…
Web	Windows, macOS, Linux
Continuous discovery of external assets such as subdomains and ports Payload-based testing rather than version matching	Very large and rapidly updated plugin library Configuration and compliance auditing alongside vulnerability scanning
Intended for authorized testing of assets you own or have permission to scan Priced and built for organisations rather than individuals	Free Essentials edition is capped at sixteen IP addresses Closed source, with subscription pricing beyond the free tier
Hosted service	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.