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

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