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Qualys Community Edition vs Nessus: catalog facts
Qualys Community Edition	Nessus
Freemium The Community Edition is free for a limited number of IPs, and the full Qualys platform is…	Freemium Nessus Essentials is free for up to sixteen IP addresses. Professional is a paid…
Web	Windows, macOS, Linux
Vulnerability assessment and asset discovery in one cloud console Includes compliance checks and web application monitoring	Very large and rapidly updated plugin library Configuration and compliance auditing alongside vulnerability scanning
Free edition is limited to a small number of IPs Cloud-hosted, so scan data is stored with Qualys	Free Essentials edition is capped at sixteen IP addresses Closed source, with subscription pricing beyond the free tier
Web application, 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 September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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