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SIGNL4 vs GoAlert: catalog facts
SIGNL4	GoAlert
Paid Commercial subscription service; see the SIGNL4 website for plans.	Free Free and open source; you host it yourself.
Android, iOS, Web	Web, Self-hosted
Alerts by push, text, voice and email with escalation On-call scheduling and call routing in one service	On-call rotations, schedules and escalation policies Integrations with Grafana, Prometheus, Site24x7, Sensu and email
Hosted commercial service rather than self-hosted software Aimed at teams and organisations, not individuals	You must host and maintain the server yourself Integration list is narrower than large commercial services
Downloadable app, Hosted service	Self-hosted
Closed source	Open source
License not stated	License not stated
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 October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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