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PRTG Network Monitor vs LibreNMS: catalog facts
PRTG Network Monitor	LibreNMS
Freemium Free for up to one hundred sensors. Larger deployments require a paid licence.	Free Free and open source. Hosting, hardware and any external services are separate.
Windows, Web, Self-hosted	Self-hosted
One hundred sensors free forever, which covers a small network Autodiscovery, maps and alerting configured through one interface	Collects device information and performance data Provides alerting and historical graphs
Licensing is per sensor and gets expensive quickly Windows server only, closed source	Device visibility depends on supported protocols and credentials.
Self-hosted	Self-hosted
Closed source	Open source
License not stated	License: GPL-3.0
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.