Checkmk

Infrastructure and application monitoring with auto-discovery, from a free edition to SaaS.

Free plan + paidOpen sourceSelf-hostableMonitoring and error tracking tools

Verified facts: 3 of 3
Alternatives ranked: 5
Approved reviews: 0
Visits sent from here: 0

About Checkmk

Checkmk is a monitoring platform from the German company Checkmk GmbH that grew out of the Nagios ecosystem. Its agent and large library of check plugins automatically discover services on servers, network devices, storage, databases, cloud accounts and Kubernetes, so a new host is usually monitored in minutes with sensible thresholds already set. Configuration is done through a web interface with rules rather than text files, and it scales to very large environments with distributed sites. It is popular with IT departments managing mixed on-premises and cloud estates. The free Community edition is GPL-licensed open source and suits small infrastructures; commercial editions add features like agent bakery, dashboards and reporting at scale, and Checkmk Cloud offers it as SaaS. Pricing for paid editions is by number of services monitored, with a free trial. The server runs on Linux, with agents for Linux, Windows and other systems.

Best for: IT teams with mixed server, network and cloud estates who want fast automatic setup.

What works

Auto-discovery sets up checks with sensible thresholds
Rule-based web configuration
Free open-source community edition

Why people leave

Best features are in paid editions
Rule system takes time to master
Server runs only on Linux

Top Checkmk alternatives

See all 5

1
Zabbix
Fully free with no paid editions, at the cost of more setup.
66.5
2
Icinga
Open-source monitoring with a powerful config language and API.
62.6
3
Nagios
The original plugin-based engine Checkmk grew from.
59.6
4
Prometheus
Better for cloud-native, container-heavy environments.
57.2
5
Site24x7
Hosted alternative with no monitoring server to maintain.
55.3

Why people left Checkmk

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Checkmk: common questions

Is Checkmk free?

Checkmk has a free plan and paid plans.

Is Checkmk open source?

Yes. The source code is on GitHub at Checkmk/checkmk. You can also run it on your own server.

What platforms does Checkmk run on?

Checkmk is available for Self-hosted, Linux and Web.

What are the best alternatives to Checkmk?

The highest-ranked Checkmk alternatives right now are Zabbix, Icinga and Nagios. See the full ranked list for pricing, platforms and verified facts.

See all 5 Checkmk alternatives

Checkmk facts

3 of 3 verified

License: GPL-2.0; Checked Oct 25, 2026github.com(opens source in a new tab); “License: GPL-2.0 (GNU General Public License v2.0).”
Free edition: Checkmk Community; Checked Oct 25, 2026checkmk.com(opens source in a new tab); “Checkmk Community | Free & Open Source IT Monitoring”
SaaS option: Checkmk Cloud; Checked Oct 25, 2026checkmk.com(opens source in a new tab); “Checkmk Cloud Full-stack observability for hybrid and cloud-native IT in a SaaS platform”