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OpenNMS vs Observium: catalog facts
OpenNMS	Observium
Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).	Freemium A free community edition is available. Professional and Enterprise editions are paid.
Self-hosted	Linux, Web, Self-hosted
Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization	Autodiscovery means devices appear with graphs and inventory automatically Clean interface that stays readable with many devices
Complexity suited to large networks may be overkill for small setups Paid tiers are needed for enterprise support and advanced features	The community edition receives releases far less often than the paid one Alerting and some features are in the subscription edition
Self-hosted, Downloadable app	Self-hosted
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.