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ElastAlert 2 vs Kapacitor: catalog facts
ElastAlert 2	Kapacitor
Free Free and open source, maintained by community contributors.	Free Free and open source under the MIT licence.
Self-hosted	Windows, Linux, Self-hosted
Works with both Elasticsearch and OpenSearch Rule-based alerts on patterns in your own data	Processes both streaming and batch time series data Publish-subscribe alerting with flexible handlers
Only useful if your data already lives in Elasticsearch or OpenSearch Rules are written as configuration files, with no graphical editor	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
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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