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Checkmk vs Naemon: catalog facts
Checkmk	Naemon
Freemium Free open-source Raw edition, with paid Enterprise and Cloud editions.	Free Free community project.
Self-hosted	Linux, Self-hosted
Auto-discovery reduces manual setup for new hosts and services Supports both agent-based and agentless SNMP monitoring	Drop-in successor for Nagios users Bug fixes and performance work on the Nagios 4 core
Advanced features and scaling are gated behind paid commercial editions Self-hosted setup and tuning takes more effort than a hosted SaaS monitor	Configuration follows the older Nagios style Needs a server to run on
Self-hosted, Downloadable app	Self-hosted
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.