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ElastAlert 2 vs Prometheus Alertmanager: catalog facts
ElastAlert 2	Prometheus Alertmanager
Free Free and open source, maintained by community contributors.	Free Free and open source as part of the Prometheus project.
Self-hosted	Self-hosted
Works with both Elasticsearch and OpenSearch Rule-based alerts on patterns in your own data	Groups hundreds of related alerts into one notification Silencing and inhibition to cut alert noise
Only useful if your data already lives in Elasticsearch or OpenSearch Rules are written as configuration files, with no graphical editor	Configured through files rather than a full graphical interface Designed around Prometheus and its alerting rules
Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License not stated	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 September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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