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OpenNMS vs SolarWinds Network Performance Monitor: catalog facts
OpenNMS	SolarWinds Network Performance Monitor
Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).	Paid Commercial license sold directly by the vendor rather than offered as a free product.
Self-hosted	Self-hosted
Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization	NetPath and intelligent maps give deep visibility into network paths Long-established, widely deployed product in enterprise IT
Complexity suited to large networks may be overkill for small setups Paid tiers are needed for enterprise support and advanced features	Commercial licensing makes it a significant cost for smaller organizations Self-hosted deployment requires dedicated infrastructure to run
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.