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Nessus vs Qualys Community Edition: catalog facts
Nessus	Qualys Community Edition
Freemium Nessus Essentials is free for up to sixteen IP addresses. Professional is a paid…	Freemium The Community Edition is free for a limited number of IPs, and the full Qualys platform is…
Windows, macOS, Linux	Web
Very large and rapidly updated plugin library Configuration and compliance auditing alongside vulnerability scanning	Vulnerability assessment and asset discovery in one cloud console Includes compliance checks and web application monitoring
Free Essentials edition is capped at sixteen IP addresses Closed source, with subscription pricing beyond the free tier	Free edition is limited to a small number of IPs Cloud-hosted, so scan data is stored with Qualys
Downloadable app	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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