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OpenNMS vs PRTG Network Monitor: catalog facts
OpenNMS	PRTG Network Monitor
Freemium Open source core (Horizon) is free, with a paid enterprise edition (Meridian).	Freemium Free for up to one hundred sensors. Larger deployments require a paid licence.
Self-hosted	Windows, Web, Self-hosted
Carrier-grade design proven at large enterprise scale Event correlation and Grafana integration for deeper visualization	One hundred sensors free forever, which covers a small network Autodiscovery, maps and alerting configured through one interface
Complexity suited to large networks may be overkill for small setups Paid tiers are needed for enterprise support and advanced features	Licensing is per sensor and gets expensive quickly Windows server only, closed source
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.