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Sensu vs Naemon: catalog facts
Sensu	Naemon
Freemium Free download, with paid plans listed on the pricing page.	Free Free community project.
Windows, Linux, Self-hosted, Command line	Linux, Self-hosted
Monitoring defined as code and applied with sensuctl Routes check results to alerting and automation handlers	Drop-in successor for Nagios users Bug fixes and performance work on the Nagios 4 core
Aimed at operations teams rather than single desktops Some features are part of paid plans	Configuration follows the older Nagios style Needs a server to run on
Downloadable app, Self-hosted	Self-hosted
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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