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PRTG Network Monitor vs Nagios XI: catalog facts
PRTG Network Monitor	Nagios XI
Freemium Free for up to one hundred sensors. Larger deployments require a paid licence.	Paid Perpetual license priced per monitored node, with a 30-day free trial.
Windows, Web, Self-hosted	Self-hosted
One hundred sensors free forever, which covers a small network Autodiscovery, maps and alerting configured through one interface	Monitors servers, network devices and applications from one self-hosted install Web config wizard and dashboards simplify setup compared to raw Nagios Core
Licensing is per sensor and gets expensive quickly Windows server only, closed source	Perpetual per-node licensing can get expensive as infrastructure grows Proprietary layer on top of Nagios Core, so it is not itself open source
Self-hosted	Self-hosted, Downloadable app
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.