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Zabbix vs PRTG Network Monitor: catalog facts
Zabbix	PRTG Network Monitor
Free Free and open source under the AGPL. Support and services are paid.	Freemium Free for up to one hundred sensors. Larger deployments require a paid licence.
Linux, Web, Self-hosted	Windows, Web, Self-hosted
Scales to tens of thousands of monitored devices with proxies Large template library covering common hardware and services	One hundred sensors free forever, which covers a small network Autodiscovery, maps and alerting configured through one interface
Configuration is extensive; the learning curve is real Interface density makes simple setups feel heavy	Licensing is per sensor and gets expensive quickly Windows server only, closed source
Self-hosted	Self-hosted
Open source	Closed source
License: AGPL-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.