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