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Prometheus Alertmanager vs ElastAlert 2: catalog facts
Prometheus Alertmanager	ElastAlert 2
Free Free and open source as part of the Prometheus project.	Free Free and open source, maintained by community contributors.
Self-hosted	Self-hosted
Groups hundreds of related alerts into one notification Silencing and inhibition to cut alert noise	Works with both Elasticsearch and OpenSearch Rule-based alerts on patterns in your own data
Configured through files rather than a full graphical interface Designed around Prometheus and its alerting rules	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 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.