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karma vs Open Alert Viewer: catalog facts
karma	Open Alert Viewer
Free Free and open source with no paid tier.	Free Free and open source under the MIT licence.
Linux, Web, Self-hosted	Linux, Android
Groups alerts to make large outages readable Web interface for creating and managing silences	One view for Prometheus, Nagios, Icinga and Zabbix alerts Runs on both Android and Linux desktop
Only useful alongside Prometheus Alertmanager Requires Alertmanager 0.22.0 or newer	Zabbix support is partial Only Basic Authentication for most backends
Self-hosted	Downloadable app
Open source	Open source
License not stated	License: MIT
No account needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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