ManageEngine OpManager vs Nagios Core

ManageEngine OpManager9.0Visit Nagios Core8.7Visit

Higher score ManageEngine OpManager #5 in Server Monitoring 9.0/10 Free plan · 30-day trial Free planFree trial✓ 0 of 3 features Visit ManageEngine

vs

Nagios Core #8 in Server Monitoring 8.7/10 Free plan Free plan✓ 1 of 3 features Visit Nagios Core

• ManageEngine OpManager fits best

  Network-heavy server environments

• Nagios Core fits best

  Free extensible monitoring with a large ecosystem

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Side by side

Feature	ManageEngine OpManager 9.0/10 Visit ↗	Nagios Core 8.7/10 Visit ↗
At a glance
Editor score	9.0	8.7
Ranking	#5 in Server Monitoring	#8 in Server Monitoring
Best for	Network-heavy server environments	Free extensible monitoring with a large ecosystem
Pricing model	Free plan + paid	Free
Starting price	$95/yr	Free plan
Free plan	✓	✓
Free trial	30 days	—
Deployment	Self-hosted	Self-hosted
Platforms	Web, Windows, Linux, iOS, Android	Linux
Support	Email, Docs	Community, Docs
Integrations	7 integrations	6 integrations
Built for	Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features ManageEngine OpManager 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	Free edition supports monitoring for up to 3 devices Maps networks and analyzes traffic across major flow protocols Enterprise tier supports distributed monitoring at large device counts	Free, GPL-licensed, self-hosted monitoring engine Plugin architecture supports custom checks and metrics Integrates with Grafana, Prometheus, Slack, and ServiceNow
Cons	Free Edition is limited to 3 devices Traffic and bandwidth analysis is provided through add-ons Network operations receive stronger emphasis than general server depth	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	ManageEngine OpManager is self-hosted monitoring software for IT teams responsible for servers, routers, switches, virtual environments, WAN links, storage, and other infrastructure. It runs on Windows or Linux and provides web, mobile,… 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 →

Strengths and trade-offs

• ManageEngine OpManager — where it wins

  • Free edition supports monitoring for up to 3 devices
  • Maps networks and analyzes traffic across major flow protocols
  • Enterprise tier supports distributed monitoring at large device counts

  Where it doesn't

  • Free Edition is limited to 3 devices
  • Traffic and bandwidth analysis is provided through add-ons
  • Network operations receive stronger emphasis than general server depth

• 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

• ManageEngine OpManager9.0/10 · Free plan · 30-day trial

  A network-focused monitor with free coverage, traffic analysis, and distributed deployment.

  Visit ManageEngineFull verdict →
• Nagios Core8.7/10 · Free plan

  A free, extensible monitoring engine for teams comfortable with self-hosted configuration.

  Visit Nagios CoreFull verdict →