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

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