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