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Kapacitor vs Riemann: catalog facts
Kapacitor	Riemann
Free Free and open source under the MIT licence.	Free Free to download and run.
Windows, Linux, Self-hosted	Linux, Self-hosted
Processes both streaming and batch time series data Publish-subscribe alerting with flexible handlers	Low-latency stream processing of monitoring events Flexible rules written as Clojure code
Tied closely to InfluxDB Tasks require learning the TICKscript language	Configuration requires learning Clojure syntax Keeps transient state rather than long-term storage
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Open source	Closed source
License: MIT	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 2, 2026	Official website Full listing and sources Checked October 1, 2026

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