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PRTG Network Monitor vs Observium: catalog facts
PRTG Network Monitor	Observium
Freemium Free for up to one hundred sensors. Larger deployments require a paid licence.	Freemium A free community edition is available. Professional and Enterprise editions are paid.
Windows, Web, Self-hosted	Linux, Web, Self-hosted
One hundred sensors free forever, which covers a small network Autodiscovery, maps and alerting configured through one interface	Autodiscovery means devices appear with graphs and inventory automatically Clean interface that stays readable with many devices
Licensing is per sensor and gets expensive quickly Windows server only, closed source	The community edition receives releases far less often than the paid one Alerting and some features are in the subscription edition
Self-hosted	Self-hosted
Closed 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.