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

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