Nessus requires a paid subscription.
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Write a ReviewNessus Essentials is free for up to 16 IPs. Nessus Professional for unlimited scanning starts at $2,790/year.
Nessus is a vulnerability scanner from Tenable. It finds security issues in your network, systems, and applications with comprehensive compliance checking.
Both are enterprise vulnerability scanners. Nessus is often deployed on-premises while Qualys is cloud-native. Compare their specific detection capabilities and deployment models.