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Checkmk vs OpenNMS: catalog facts
Checkmk	OpenNMS
Freemium Free open-source Raw edition, with paid Enterprise and Cloud editions.	Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).
Self-hosted	Self-hosted
Auto-discovery reduces manual setup for new hosts and services Supports both agent-based and agentless SNMP monitoring	Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization
Advanced features and scaling are gated behind paid commercial editions Self-hosted setup and tuning takes more effort than a hosted SaaS monitor	Complexity suited to large networks may be overkill for small setups Paid tiers are needed for enterprise support and advanced features
Self-hosted, Downloadable app	Self-hosted, Downloadable app
Open source	Open 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.