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Head-to-head · Server Monitoring

Icinga vs Nagios Core

  • Updated Oct 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score Icinga #7 in Server Monitoring 8.8/10 Free plan · 60-day trial Free planFree trial✓ 0 of 3 features Visit Icinga
Nagios Core #8 in Server Monitoring 8.7/10 Free plan Free plan✓ 1 of 3 features Visit Nagios Core

Icinga leads on 0 checks, Nagios Core on 0, and 2 are even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreIcinga · 8.8/10
  • Free planboth
  • Free trialonly Icinga
  • Most featuresNagios Core · 1 of 3

Icinga scores higher on our rubric for server monitoring: 8.8 against 8.7 out of 10; our editors rank them #7 and #8.

Icinga is the better fit for open-source distributed monitoring. Nagios Core is the better fit for free extensible monitoring with a large ecosystem.

  • Icinga fits best

    Open-source distributed monitoring

  • Nagios Core fits best

    Free extensible monitoring with a large ecosystem

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Icinga 8.8/10 Visit ↗ Nagios Core 8.7/10 Visit ↗
At a glance
Editor score 8.8 8.7
Ranking #7 in Server Monitoring #8 in Server Monitoring
Best for Open-source distributed monitoring Free extensible monitoring with a large ecosystem
Pricing model Free plan + paid Free
Starting price — Free plan
Free plan ✓ ✓
Free trial 60 days —
Deployment Self-hosted Self-hosted
Platforms Web, Linux, Windows Linux
Support Email, Phone · 24/7 Community, Docs
Integrations 10 integrations 6 integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Icinga 0/3 · Nagios Core 1/3
Server auto-discovery Not checked yet Not checked yet
Process monitoring Not checked yet ✓ (best)
Container monitoring Not checked yet Not checked yet
Specs
Included hosts Not checked yet Not checked yet
Metric retention Not checked yet Not checked yet
Monitoring method Not checked yet Hybrid
Supported operating systems Not checked yet Linux, Unix, Windows
Our review
Pros
  • Unlimited hosts and services in the Forever Free Edition
  • Agent-based and agentless monitoring across Linux and Windows
  • Strong integrations with Prometheus, Grafana, AWS, and automation tools
  • Free, GPL-licensed, self-hosted monitoring engine
  • Plugin architecture supports custom checks and metrics
  • Integrates with Grafana, Prometheus, Slack, and ServiceNow
Cons
  • Self-hosted deployment requires infrastructure managed by your team
  • Enterprise modules are available through a paid subscription
  • Primarily deployed on Linux, with Windows covered through agents and checks
  • Configuration relies mainly on text files and command-line workflows
  • The platform listing is limited to Linux
  • It lacks a server auto-discovery feature
Our verdict

Icinga is an open-source infrastructure monitoring system for IT teams responsible for servers, networks, applications, cloud resources, containers, and virtualized environments. It monitors host and service availability, supports VMware…

Read the review →

Nagios Core is a free, GPL-licensed, self-hosted monitoring engine for IT infrastructure. It monitors servers, workstations, network devices, websites, applications, services, and custom metrics through a plugin-based architecture. Its…

Read the review →
  1. IcingaServer Monitoring 8.8Free plan · 60-day trial
  2. Nagios CoreServer Monitoring 8.7Free plan

Strengths and trade-offs

  • Icinga — where it wins

    • Unlimited hosts and services in the Forever Free Edition
    • Agent-based and agentless monitoring across Linux and Windows
    • Strong integrations with Prometheus, Grafana, AWS, and automation tools

    Where it doesn't

    • Self-hosted deployment requires infrastructure managed by your team
    • Enterprise modules are available through a paid subscription
    • Primarily deployed on Linux, with Windows covered through agents and checks

  • Nagios Core — where it wins

    • Free, GPL-licensed, self-hosted monitoring engine
    • Plugin architecture supports custom checks and metrics
    • Integrates with Grafana, Prometheus, Slack, and ServiceNow

    Where it doesn't

    • Configuration relies mainly on text files and command-line workflows
    • The platform listing is limited to Linux
    • It lacks a server auto-discovery feature

More comparisons

All server monitoring comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update