Free and open first

Best Infrastructure Monitoring in 2026

Infrastructure monitoring software helps you keep track of the systems and services that support your applications. Compare deployment models and agentless monitoring, then check OS coverage, included hosts, and metrics retention to understand the scope each option lists. Service monitoring and VM monitoring show which areas are covered; free plans and starting paid prices add cost context. Netdata, Checkmk, and openITCOCKPIT are among the entries to consider. Weigh these details against the hosts, virtual machines, and services you need to observe, as well as how long you want metrics retained.

34 apps
Research read 23 Sept 2026
How the order is worked out

1

Checkmk

Free plan Open source AndroidAPIiPhone+5

Checkmk offers broad infrastructure coverage and several monitoring methods, with a free Community option for smaller environments.

9.3 Free plan · paid from €190/mo (annual) · 30-day trial Visit site
2

MetricsHub

Free plan Open source APILinuxSelf-hosted+2

MetricsHub brings broad infrastructure collection, a web interface, and named observability integrations to a self-hosted deployment.

9.0 Free plan · paid from $15/mo · 30-day trial Visit site
3

Netdata

Free plan Open source AndroidAPIiPhone+5

Netdata combines infrastructure metrics, logs, alerts, and troubleshooting across cloud and on-premises deployment options.

8.9 Free plan · paid from $4.50/mo (annual) · 14-day trial Visit site
4

Azure Monitor

Free plan APILinuxMac+2

7.7 Free plan · 30-day trial Visit site
5

Checkmate
by Checkmate
Free plan APILinuxMac+3

Checkmate brings service checks, server metrics, PageSpeed tracking, and incident alerts into a self-hosted dashboard.

7.7 Free plan Visit site
6

Google Cloud Monitoring

Free plan APILinuxWeb+1

Google Cloud Monitoring brings metrics, uptime checks, dashboards, and alerting into a cloud service with support for hybrid and multicloud environments.

7.5 Free plan Visit site
7

Gyeeta

Free plan APILinuxSelf-hosted+1

Gyeeta provides self-hosted Linux observability with service discovery, multi-host queries, and several alert channels.

7.5 Free plan Visit site
8

Icinga

Free plan APILinuxSelf-hosted+2

Icinga offers self-hosted monitoring with a free edition and options for distributed setups, certificate monitoring, and integrations.

7.5 Free plan · 60-day trial Visit site
9

Mackerel

Free plan APILinuxWeb+1

Mackerel combines host and service metrics with cloud and container monitoring options.

7.4 Free plan · paid from 2,180 JPY/mo · 14-day trial Visit site
10

Nagios XI

Free plan APILinuxMac+3

Nagios XI offers self-hosted monitoring, a limited free edition, and perpetual paid licenses priced by node count.

7.3 From $4,995 · 30-day trial Visit site
11

CloudPhysics

Free plan Web

Choose HPE CloudPhysics if you need an assessment of VMware workloads and supporting compute and storage, with findings reviewed by specialists.

7.2 Pricing on request · 30-day trial Visit site
12

Monit

Free plan LinuxMacSelf-hosted

Monit combines system checks, alerts, and process actions in a free self-hosted utility for Linux and macOS.

7.2 Free plan Visit site
13

Munin

Free plan APILinuxSelf-hosted

Choose Munin if you want free, self-hosted resource monitoring with graphing, a broad plugin ecosystem, and configurable alerts.

7.2 Open source Visit site
14

openITCOCKPIT

Free plan APIiPhoneLinux+4

openITCOCKPIT covers a broad range of infrastructure and application monitoring, with dashboards, reporting, and integrations.

7.2 Free plan Visit site
15

Performance Co-Pilot

Free plan APILinuxMac+2

Choose PCP if you need a free, self-hosted toolkit for collecting and analyzing performance data across multiple hosts.

7.1 Open source Visit site
16

Prometheus

Free plan LinuxMacSelf-hosted+2

Prometheus provides a free monitoring and alerting toolkit with flexible metric collection and querying. Its stated accuracy limitation makes it unsuitable for per-request billing workloads.

7.1 Free plan Visit site
17

Monitorix

Free plan LinuxSelf-hosted

Choose Monitorix if you want a free, self-hosted tool for server, service, and hardware monitoring, with multihost graphs and configurable history.

7.0 Free plan Visit site
18

Oracle Cloud Infrastructure Container Registry

Free plan APILinuxWeb

7.0 Free plan Visit site
19

Sensu Go

Free plan APILinuxMac+3

Sensu Go combines event processing, infrastructure discovery, alerting, and remediation in a self-hosted monitoring product.

7.0 Free plan · paid from $3/mo (annual) · 14-day trial Visit site
20

Site24x7 Server Monitoring

Free plan AndroidAPIiPhone+4

Site24x7 Server Monitoring brings server metrics, agent and agentless monitoring, and integrations into one platform.

7.0 Free plan · paid from $9/mo (annual) · 30-day trial Visit site
21

Sematext Monitoring

Free plan LinuxWebWindows

Choose Sematext Monitoring if you need broad infrastructure coverage, service integrations, and alerting across Linux, Windows, and cloud environments.

6.9 Free plan · paid from $2.80/mo · 14-day trial Visit site
22

Zabbix

Free plan APILinuxMac+3

Zabbix covers a broad range of monitoring sources and methods, with synthetic browser checks and a free plan. Subscription support and server or proxy allowances vary by tier.

6.9 Free plan · paid from $50/mo · 5-day trial Visit site
23

Datadog Infrastructure Monitoring

Free plan LinuxMacWeb+1

6.8 Free plan · paid from $15/mo (annual) · 14-day trial Visit site
24

eG Enterprise

Free trial LinuxSelf-hostedWeb+1

Choose eG Enterprise if you need monitoring across applications and infrastructure, including transaction tracing and user-experience analysis.

6.5 From $100/mo · 21-day trial Visit site
25

Fivenines

Free trial APILinuxWeb+1

Fivenines covers infrastructure, uptime, and scheduled-job monitoring with automation and several developer interfaces.

6.5 From €15/mo · 14-day trial Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

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