SIGNL4 - Mobile Alerting

SIGNL4 - Mobile Alerting

Critical Alert Notifications

156 ratings
6 reviews
Free

Details

  • Released
  • Updated
  • September 21, 2017
  • June 24, 2026

Features

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About

This app provides instant mobile alerting for critical incidents across various sectors like worker safety, IT operations, and disaster response. It ensures timely notification and response for teams through persistent alerts, acknowledgements, tracking, and escalations.

Instant mobile alerting
Persistent notifications (push, SMS, voice)
Acknowledgement and tracking
Automated escalations
On-call duty and shift management
Integrations with IT/IoT systems
Audit trails and reporting
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What's New in SIGNL4

6.1.3

June 24, 2026

Minor fixes and improvements.

User reviews

Okay, fair play.

They patched the issue I was having and quite quickly too. :)

Why Only emergency

Only emergency is bypassing do not disturb and silence. Why IT Is not??? How can we configure this?

Response from developer

Hi, you can set this for each alert category but you have to do this on each mobile app for each user separately.

Super easy and effective!

I use SIGNL4 to receive critical alerts that cannot be missed. It never fails to send alerts and the app is very user friendly! I highly recommend it.

SIGNL4 is how alerting should feel

Very visual and easy to use - you can customize your experience and I love the simple punch in and punch out. The design makes it fun to use and the fact that it is mainly app based means that you can finally really carry your mobile alerting in your pocket. Love it and can only recommend it...

Very effective app

This app is incredibly well thought out. It’s easy to use, very fast raising alerts and keeps your whole team informed of issues as they progress through to resolution.

The webhook functionality is brilliant, allowing two-way communication with existing systems, and the developers responded immediately to a additional functionality request - very impressive!
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Developer apps

FAQ

How does SIGNL4 ensure critical alerts are received?

SIGNL4 uses targeted and persistent mobile push notifications, text messages, and voice calls to ensure critical alerts reach the intended recipients. It also provides acknowledgement and tracking features to confirm receipt and response.

Can SIGNL4 integrate with my existing IT systems?

Yes, SIGNL4 offers simple interfaces like email and webhooks for quick integration with systems such as IT monitoring, ITSM, IoT devices, and SCADA. It has verified integrations with over 150 third-party tools.

How does SIGNL4 handle on-call scheduling?

SIGNL4 provides convenient on-call duty and shift scheduling to ensure the right information is delivered to the right people at the right time. This helps manage the timely availability of operations teams.

What kind of reporting does SIGNL4 offer?

SIGNL4 provides complete audit trails of all notifications and responses, which can be downloaded in CSV format. It also monitors and reports hours spent on duty.

Is SIGNL4 available on multiple devices?

SIGNL4 is supported on iPhone and iPod devices. The app is rated for ages 4 and up.

How often is SIGNL4 updated?

The latest version of SIGNL4 is 5.5.2, and it was last updated on March 30, 2026. This indicates a consistent update schedule.

What is the user sentiment for SIGNL4?

SIGNL4 has a strong user rating of 4.5 stars based on 148 ratings, suggesting positive user sentiment regarding its functionality and reliability.

Can I raise alerts directly from the SIGNL4 mobile app?

Yes, SIGNL4 enables users to raise alerts directly from the mobile application. It also features integrated mobile chat for team communication.