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LibreNMS vs PRTG Network Monitor: catalog facts
LibreNMS	PRTG Network Monitor
Free Free and open source. Hosting, hardware and any external services are separate.	Freemium Free for up to one hundred sensors. Larger deployments require a paid licence.
Self-hosted	Windows, Web, Self-hosted
Collects device information and performance data Provides alerting and historical graphs	One hundred sensors free forever, which covers a small network Autodiscovery, maps and alerting configured through one interface
Device visibility depends on supported protocols and credentials.	Licensing is per sensor and gets expensive quickly Windows server only, closed source
Self-hosted	Self-hosted
Open source	Closed source
License: GPL-3.0	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.