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Alerta vs karma: catalog facts
Alerta	karma
Free Free and open source.	Free Free and open source with no paid tier.
Web, Self-hosted, Command line	Linux, Web, Self-hosted
Deduplicates alerts from many monitoring sources Wide range of ready-made integrations	Groups alerts to make large outages readable Web interface for creating and managing silences
Needs a server and database to run Homepage content has not been updated in some time	Only useful alongside Prometheus Alertmanager Requires Alertmanager 0.22.0 or newer
Self-hosted	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.