Signl4
Mobile alerting and incident response app — sends critical alerts via push, SMS, or voice and tracks acknowledgements.
| What is it | Mobile alerting and incident response app — sends critical alerts via push, SMS, or voice and tracks acknowledgements. |
|---|---|
| Pricing | Freemium — from $9/mo |
| Free tier | Yes |
| Platform | Web Application |
| API | Yes |
| Works with | Make, n8n, Workato |
| Best for | Receiving critical infrastructure alerts on mobile, Managing on-call rotations and escalations |
| Domain registered | 2016 |
Data updated Aug. 1, 2026
What does Signl4 do?
Signl4 is a mobile alerting and incident response platform built for IT operations and DevOps teams. It takes alerts from monitoring tools like Prometheus, Datadog, or Azure Monitor and pushes them to the right person on duty via push notification, SMS, or voice call. The app tracks who acknowledged the alert, escalates if nobody responds, and keeps a timeline of every action taken. It's essentially a smart pager system for modern teams.
The platform works by unifying alerts from multiple sources into a single feed, then routing them based on on-call schedules and escalation policies. Signl4 supports two-way communication — responders can update the incident status from their phone, and stakeholders get real-time updates. It integrates with over 50 tools through webhooks and APIs, and offers a mobile app for iOS and Android. The setup is straightforward: connect your monitoring tools, define who is on call, and alerts start flowing.
Signl4 is most useful for teams that need to respond to critical incidents outside of office hours — think IT admins, site reliability engineers, and facility managers. It replaces noisy email alerts and missed Slack messages with a reliable, tracked notification system. If your team deals with server outages, security alerts, or equipment failures, Signl4 makes sure someone actually sees the alert and acts on it.
Key features
What makes it stand outWho is Signl4 for?
Who benefits most from this toolPricing
Free tier available — start without a credit cardStarter
- 5 max users
- Push Alerts
- Native mobile App
- Ad-hoc Duty Management
- ‘Who is on call’ dashboard
- Acknowledgements
- Email, Webhook, REST API
- Distribution Rules
- Teams & Slack Integration
- SSO via 3rd party
- Unlimited Teams
Notify & Connect
Everything in Starter, plus:
- Text & Voice Alert included
- Persistent notifications
- ChatOps
- Geolocations & Maps
- Manual Alerts from web browser or mobile app
- User Roles, No limit for # of Teams/Users
- Chat & Email Support
Optimize
Everything in Notify & Connect, plus:
- Automated Escalations
- Flood protection
- Duty & Shift Scheduling
- Post-shift reports
- Calendar export
- Remote Actions
- Rules with logical conditions
- 2-way 3rd party connectors
- AI Ops & AI Alerting
Maximize
Everything in Optimize, plus:
- Live Call Routing
- Voice mailbox with alerts
- Public ‘Who is on call’ Dashboard
- Audit Logs
- Custom Data Retention
- User Provisioning via SCIM
- Priority Support
- SLA 99.95%
Trust & presence
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