Nagios

#20 in Server Monitoring

Saint Paul, MN

Products on G2

Total reviews

4.4

Avg. star rating

Nagios XI ranks #20 in Server Monitoring.
Nagios's 2 products span 4 categories on G2.
Mid-Market is the largest segment among reviewers, at 60.7%.

Traffic & LLM citations

Monthly G2.com page views and citations by AI answer engines, summed across Nagios's products.

Page views and citations · Nagios

Source: G2 review data

Losing to

Based on reviewers of other products who said they switched from Nagios.

Checkmk

16 switched

SolarWinds Worldwide LLC

Zabbix

Datadog

Zoho

Key stats

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#20

Mid-Market

2007

Saint Paul, MN

Adoption by company size

Segment	Share of reviews
Small Business	13.5%
Mid-Market	60.7%
Enterprise	25.8%

Quarterly history

Quarter	Total reviews	Avg. rating
2024 Q4	1	5.0
2025 Q2	1	4.5
2025 Q4	2	4.3
2026 Q1	1	5.0

About Nagios

Nagios is a widely-used open-source monitoring system designed to oversee the health and performance of IT infrastructure. It helps organizations proactively identify and resolve issues by offering monitoring capabilities for servers, network devices, applications, and services. Nagios provides robust alerting and reporting features, allowing IT teams to respond to incidents swiftly and maintain optimal system performance. Its flexibility and extendibility are bolstered by a variety of plugins and integrations, catering to diverse monitoring needs.