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Nagios Core vs Nagios XI: catalog facts
Nagios Core	Nagios XI
Free Free and open source. Hosting, hardware and any external services are separate.	Paid Perpetual license priced per monitored node, with a 30-day free trial.
Self-hosted	Self-hosted
Runs plugin-based checks Tracks availability and sends notifications	Monitors servers, network devices and applications from one self-hosted install Web config wizard and dashboards simplify setup compared to raw Nagios Core
Configuration and many checks need manual setup or additional plugins.	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
Open source	Closed source
License: GPL-2.0	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.