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Riemann vs Sensu: catalog facts
Riemann	Sensu
Free Free to download and run.	Freemium Free download, with paid plans listed on the pricing page.
Linux, Self-hosted	Windows, Linux, Self-hosted, Command line
Low-latency stream processing of monitoring events Flexible rules written as Clojure code	Monitoring defined as code and applied with sensuctl Routes check results to alerting and automation handlers
Configuration requires learning Clojure syntax Keeps transient state rather than long-term storage	Aimed at operations teams rather than single desktops Some features are part of paid plans
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Closed 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 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.