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Nagios Core vs Sensu: catalog facts
Nagios Core	Sensu
Free Free and open source. Hosting, hardware and any external services are separate.	Freemium Free download, with paid plans listed on the pricing page.
Self-hosted	Windows, Linux, Self-hosted, Command line
Runs plugin-based checks Tracks availability and sends notifications	Monitoring defined as code and applied with sensuctl Routes check results to alerting and automation handlers
Configuration and many checks need manual setup or additional plugins.	Aimed at operations teams rather than single desktops Some features are part of paid plans
Self-hosted	Downloadable app, Self-hosted
Open source	Closed source
License: GPL-2.0	License not stated
Not stated if an account is needed	No account 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 October 1, 2026

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