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Sensu vs Riemann: catalog facts
Sensu	Riemann
Freemium Free download, with paid plans listed on the pricing page.	Free Free to download and run.
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	Low-latency stream processing of monitoring events Flexible rules written as Clojure code
Aimed at operations teams rather than single desktops Some features are part of paid plans	Configuration requires learning Clojure syntax Keeps transient state rather than long-term storage
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Closed source	Closed 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 October 1, 2026

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