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Nagios

Nagios offers powerful, open-source IT infrastructure monitoring solutions.

Free tierPrice verified 2026-09-30Visit site ↗
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Our verdict

Who it's for

The industry standard in open-source IT monitoring tools for servers, networks, applications, and services.

Who should look elsewhere

UI very dated

Pros

  • +Legacy monitoring standard
  • +Highly customizable
  • +Large plugin library
  • +Free and open source
  • +Battle-tested

Cons

  • −UI very dated
  • −Configuration complex
  • −Scaling difficult
  • −Setup time-consuming
  • −Alternatives more modern

Key features

  • ✓Infrastructure monitoring
  • ✓Alert notifications
  • ✓Plugin architecture
  • ✓Network analysis
  • ✓Log monitoring
  • ✓Open source

Pricing

PlanPriceBillingNotes
Core (Free)$0monthOpen source; Community support; Unlimited hosts
XI Standard$1995month7 Nodes or 100 Services; Advanced Reporting; Custom Dashboards
XI Professional$3495monthAudit Logging; Bulk-Modification Tools; Capacity Planning

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