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PRTG Network Monitor vs Zabbix: catalog facts
PRTG Network Monitor	Zabbix
Freemium Free for up to one hundred sensors. Larger deployments require a paid licence.	Free Free and open source under the AGPL. Support and services 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	Scales to tens of thousands of monitored devices with proxies Large template library covering common hardware and services
Licensing is per sensor and gets expensive quickly Windows server only, closed source	Configuration is extensive; the learning curve is real Interface density makes simple setups feel heavy
Self-hosted	Self-hosted
Closed source	Open source
License not stated	License: AGPL-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.