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Prometheus Alertmanager vs Alerta: catalog facts
Prometheus Alertmanager	Alerta
Free Free and open source as part of the Prometheus project.	Free Free and open source.
Self-hosted	Web, Self-hosted, Command line
Groups hundreds of related alerts into one notification Silencing and inhibition to cut alert noise	Deduplicates alerts from many monitoring sources Wide range of ready-made integrations
Configured through files rather than a full graphical interface Designed around Prometheus and its alerting rules	Needs a server and database to run Homepage content has not been updated in some time
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
No account needed	Not stated if an account is 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 24, 2026

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