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Nagios XI vs Nagios Core: catalog facts
Nagios XI	Nagios Core
Paid Perpetual license priced per monitored node, with a 30-day free trial.	Free Free and open source. Hosting, hardware and any external services are separate.
Self-hosted	Self-hosted
Monitors servers, network devices and applications from one self-hosted install Web config wizard and dashboards simplify setup compared to raw Nagios Core	Runs plugin-based checks Tracks availability and sends notifications
Perpetual per-node licensing can get expensive as infrastructure grows Proprietary layer on top of Nagios Core, so it is not itself open source	Configuration and many checks need manual setup or additional plugins.
Self-hosted, Downloadable app	Self-hosted
Closed source	Open source
License not stated	License: GPL-2.0
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.