Compare software

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