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Robusta vs Prometheus Alertmanager: catalog facts
Robusta	Prometheus Alertmanager
Free The open-source project is free to install in your own cluster.	Free Free and open source as part of the Prometheus project.
Self-hosted	Self-hosted
Groups related Prometheus alerts to cut noise Adds cluster context to each alert	Groups hundreds of related alerts into one notification Silencing and inhibition to cut alert noise
Only relevant for Kubernetes and Prometheus setups AI enrichment features may depend on external services	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 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.