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SIGNL4 vs Spike.sh: catalog facts
SIGNL4	Spike.sh
Paid Commercial subscription service; see the SIGNL4 website for plans.	Paid Paid service with a 14-day free trial that needs no credit card.
Android, iOS, Web	Web
Alerts by push, text, voice and email with escalation On-call scheduling and call routing in one service	Alerts by phone, SMS, WhatsApp and Slack Rule-based routing on title, severity and payload priority
Hosted commercial service rather than self-hosted software Aimed at teams and organisations, not individuals	Hosted service only Paid after the trial period
Downloadable app, Hosted service	Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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