Wazuh vs Nessus: Which is Better in 2026?
Choosing between Wazuh and Nessus comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Wazuh wins this matchup. ESET is our overall Vulnerability Scanning pick. Malwarebytes is our free Vulnerability Scanning pick. Pick Nessus if you need vulnerability scanning.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Wazuh
Open-source security monitoring
Best for you if:
- • You want a fully free tool (Nessus requires payment)
Nessus
Vulnerability assessment scanner
Best for you if:
- • You want industry standard scanner
| At a Glance | Nessus | |
|---|---|---|
Starts at | Free 100% free | $2990/mo Professional |
Category | Security Monitoring Vulnerability Scanning | Vulnerability Scanning Security |
Rating | 4.5/5 G2 4.5 71 reviews | 4.6/5 G2 4.5 · Capterra 4.7 402 reviews |
Free plan | Yes | No |
Choose Wazuh or Nessus?
Choose Wazuh if
- You want a fully free tool (Nessus requires payment)
- You want open source SIEM
- You want good features
- You work in security monitoring, not vulnerability scanning
Choose Nessus if
- You want industry standard scanner
- You want good vulnerability detection
- You work in vulnerability scanning, not security monitoring
In-Depth Analysis
Wazuh
Open-source security monitoring
Wazuh's pricing is exceptionally generous, offering a full-featured open-source SIEM/XDR solution for $0.
Strengths
- Pro: Open source SIEM
- Pro: Good features
- Pro: Self-hostable
- Pro: Active development
- Pro: Free
Weaknesses
- Con: Complex setup
- Con: Learning curve
- Con: Resource intensive
- Con: Documentation gaps
- Con: Enterprise features paid
Key features
Nessus
Vulnerability assessment scanner
Nessus offers a fair entry point with its free tier, but the Professional tier at $2990/year is quite expensive for basic vulnerability scanning compared to some market alternatives.
Strengths
- Pro: Industry standard scanner
- Pro: Good vulnerability detection
- Pro: Comprehensive coverage
- Pro: Good reporting
- Pro: Active development
Weaknesses
- Con: Expensive
- Con: Learning curve
- Con: Resource intensive
- Con: Per-asset pricing
- Con: Better alternatives exist
Key features
Pricing: Wazuh vs Nessus
| Plan | Wazuh | Nessus |
|---|---|---|
| Tier 1 | Free Open Source | Free Essentials (Free) |
| Tier 2 | Free Cloud | $2990 Professional |
| Tier 3 | N/A | $5890 Expert |
Pricing verified from each vendor's public pricing page. Compare in detail on Wazuh pricing and Nessus pricing.
Key Takeaways
Wazuh
- Completely free
- Our pick for this comparison
Nessus
- Higher user rating: 4.6/5 vs 4.5/5
- Larger review base (402 reviews)
- Better fit for vulnerability scanning
The Bottom Line
Wazuh wins this matchup. ESET is our overall Vulnerability Scanning pick. Malwarebytes is our free Vulnerability Scanning pick.
Frequently Asked Questions
Is Wazuh or Nessus better in 2026?
Wazuh wins this matchup. ESET is our overall Vulnerability Scanning pick. Malwarebytes is our free Vulnerability Scanning pick. Pick Wazuh for security monitoring workflows (main strength: open source SIEM). Pick Nessus for vulnerability scanning workflows (main strength: industry standard scanner).
What are Wazuh and Nessus used for?
Wazuh: Open-source security monitoring. Nessus: Vulnerability assessment scanner.
What does Wazuh cost vs Nessus?
Wazuh is free. Nessus's paid plans start at $2990/mo (Professional).
What's the main difference between Wazuh and Nessus?
Wazuh's main strength: open source SIEM. Nessus's main strength: industry standard scanner.