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Alerta vs Prometheus Alertmanager: catalog facts
Alerta	Prometheus Alertmanager
Free Free and open source.	Free Free and open source as part of the Prometheus project.
Web, Self-hosted, Command line	Self-hosted
Deduplicates alerts from many monitoring sources Wide range of ready-made integrations	Groups hundreds of related alerts into one notification Silencing and inhibition to cut alert noise
Needs a server and database to run Homepage content has not been updated in some time	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
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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