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Kapacitor vs Prometheus: catalog facts
Kapacitor	Prometheus
Free Free and open source under the MIT licence.	Free The open-source software is available without a license fee. Hosting, hardware and…
Windows, Linux, Self-hosted	Windows, macOS, Linux, Self-hosted
Processes both streaming and batch time series data Publish-subscribe alerting with flexible handlers	Label-based data model and PromQL make ad-hoc questions easy to answer Pull model needs no agent configuration beyond exposing a metrics endpoint
Tied closely to InfluxDB Tasks require learning the TICKscript language	Local storage is not clustered; long retention needs Thanos, Mimir or similar Pull model does not suit short-lived jobs without a push gateway
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: MIT	License: Apache-2.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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