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Moira vs Prometheus Alertmanager: catalog facts
Moira	Prometheus Alertmanager
Free Free and open source; you host it yourself.	Free Free and open source as part of the Prometheus project.
Self-hosted	Self-hosted
Realtime alerting on Graphite and Prometheus metrics Separate API, checker and notifier services	Groups hundreds of related alerts into one notification Silencing and inhibition to cut alert noise
Needs an existing Graphite or Prometheus metrics setup Several services to deploy and maintain	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 October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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