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Riemann vs Kapacitor: catalog facts
Riemann	Kapacitor
Free Free to download and run.	Free Free and open source under the MIT licence.
Linux, Self-hosted	Windows, Linux, Self-hosted
Low-latency stream processing of monitoring events Flexible rules written as Clojure code	Processes both streaming and batch time series data Publish-subscribe alerting with flexible handlers
Configuration requires learning Clojure syntax Keeps transient state rather than long-term storage	Tied closely to InfluxDB Tasks require learning the TICKscript language
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Closed source	Open source
License not stated	License: MIT
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 2, 2026

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