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Nagios Core vs Checkmk: catalog facts
Nagios Core	Checkmk
Free Free and open source. Hosting, hardware and any external services are separate.	Freemium Free open-source Raw edition, with paid Enterprise and Cloud editions.
Self-hosted	Self-hosted
Runs plugin-based checks Tracks availability and sends notifications	Auto-discovery reduces manual setup for new hosts and services Supports both agent-based and agentless SNMP monitoring
Configuration and many checks need manual setup or additional plugins.	Advanced features and scaling are gated behind paid commercial editions Self-hosted setup and tuning takes more effort than a hosted SaaS monitor
Self-hosted	Self-hosted, Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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