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Checkmk vs Nagios XI: catalog facts
Checkmk	Nagios XI
Freemium Free open-source Raw edition, with paid Enterprise and Cloud editions.	Paid Perpetual license priced per monitored node, with a 30-day free trial.
Self-hosted	Self-hosted
Auto-discovery reduces manual setup for new hosts and services Supports both agent-based and agentless SNMP monitoring	Monitors servers, network devices and applications from one self-hosted install Web config wizard and dashboards simplify setup compared to raw Nagios Core
Advanced features and scaling are gated behind paid commercial editions Self-hosted setup and tuning takes more effort than a hosted SaaS monitor	Perpetual per-node licensing can get expensive as infrastructure grows Proprietary layer on top of Nagios Core, so it is not itself open source
Self-hosted, Downloadable app	Self-hosted, Downloadable app
Open source	Closed source
License not stated	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.