Compare software

Kapacitor vs ElastAlert 2: catalog facts
Kapacitor	ElastAlert 2
Free Free and open source under the MIT licence.	Free Free and open source, maintained by community contributors.
Windows, Linux, Self-hosted	Self-hosted
Processes both streaming and batch time series data Publish-subscribe alerting with flexible handlers	Works with both Elasticsearch and OpenSearch Rule-based alerts on patterns in your own data
Tied closely to InfluxDB Tasks require learning the TICKscript language	Only useful if your data already lives in Elasticsearch or OpenSearch Rules are written as configuration files, with no graphical editor
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: MIT	License not stated
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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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