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Monit vs Nagios Core: catalog facts
Monit	Nagios Core
Free Monit is free and open source; the separate M/Monit dashboard is a commercial product.	Free Free and open source. Hosting, hardware and any external services are separate.
macOS, Linux, Command line	Self-hosted
Restarts failed services and acts on resource limits automatically Very small footprint	Runs plugin-based checks Tracks availability and sends notifications
No Windows support Central management of many hosts needs the paid M/Monit	Configuration and many checks need manual setup or additional plugins.
Downloadable app	Self-hosted
Open source	Open source
License: AGPL-3.0	License: GPL-2.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.