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Moira vs Kapacitor: catalog facts
Moira	Kapacitor
Free Free and open source; you host it yourself.	Free Free and open source under the MIT licence.
Self-hosted	Windows, Linux, Self-hosted
Realtime alerting on Graphite and Prometheus metrics Separate API, checker and notifier services	Processes both streaming and batch time series data Publish-subscribe alerting with flexible handlers
Needs an existing Graphite or Prometheus metrics setup Several services to deploy and maintain	Tied closely to InfluxDB Tasks require learning the TICKscript language
Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License not stated	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 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.