# SIGNL4 - Mobile Alerting — Critical Alert Notifications > Critical incident alerting and response management for mobile teams. (iPhone/iPad app by Derdack GmbH.) - Source: https://appshunter.io/ios/app/signl4-mobile-alerting/id1100283480 (this page in markdown: same URL + `.md`) - Developer: [Derdack GmbH](https://appshunter.io/developer/466792511) - Category: Productivity, Business - Price: Free - Rating: 4.50/5 from 160 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 55 MB - Languages: American English, German (Germany) - Released: 2017-09-21 - Data updated: 2026-08-23 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/signl4-mobile-alerting/id1100283480/reviews.md ## What is SIGNL4? In case of critical incidents in areas like workers safety, 24/7 IT operations, manufacturing continuity or disaster response, SIGNL4 is your tool for instant mobile alerting. It is designed to effectively alert and notify incident response teams like firefighters, emergency teams, IT Ops or Security Ops staff, field service technicians and maintenance engineers. SIGNL4 adds critical mobile alerting to your services and systems in no time. It bridges the ‘last mile’ from IT and IoT systems, machines and sensors to engineers, IT staff and workers ‘in the field’ and accelerates response up to 10x. SIGNL4 notifies staff on duty through targeted and persistent mobile push, text messages and voice calls with acknowledgement, tracking and escalation. It provides for convenient on-call duty and shift scheduling to reliably delivers the right information to the right people at the right time – anywhere. SIGNL4 enables mission-critical systems in IT, IoT, on the shop floor and in hundred other areas to automatically notify the right people when response time matters. SIGNL4 provides simple and convenient interfaces like email and webhooks to quickly connect systems like IT monitoring, IT service management, IoT devices, SCADA systems, security cameras and more. We have verified 150+ integrations with 3rd party tools. SIGNL4 enables to: * Reliably and persistently dispatch critical alerts and work items to field staff, maintenance engineers and mobile workforce * Automate alerting/escalation processes by linking machines, IT or any other critical infrastructure application to the right person at the right time * Accelerate and ensure response by providing persistent notifications, response tracking and escalations * Manage timely availability of operations teams (on-call duties, shifts) to route alerts automatically * Link any system directly to staff in charge. Consolidate events and alerts from multiple sources. Create a single pane of glass for critical information SIGNL4 provides: * A new visual experience for critical alerts * Persistent and trackable alert notifications by mobile push, voice calls and text * Automated escalations based on target response times * Scheduled and ad-hoc on-call duty and shift management * Shared annotations to alerts and audit trails * Raising of alerts from the mobile app * Integrated mobile chat * Alert notifications to your entire team or team members on duty * Custom sounds for your critical alerts * One-touch connect with your team members * Monitors, tracks and reports your hours spend on duty (CSV download) * Complete audit trails of all notifications and response (CSV download) * Comprehensive API for 3rd party integrations How can you trigger alerts and notifications? * Send an email or call our webhook (REST API) * From IT Monitoring systems like PRTG, Zabbix, CheckMK, SCOM, Solarwinds, Dynatrace, Datadog, Grafana, Icinga, Nagios, BMC, Netapp, New Relic, Splunk * From ITSM systems like ConnectWise, ServiceNow, Freshdesk, Freshservice, SMAX, Topdesk, Remedy * From IT Security systems like Azure Sentinel, Azure Security, Sophos * From automation platforms like Zapier, Microsoft PowerAutomate, Node-Red, UIPath * From IoT and OT like Wonderware, Siemens, zenon, IXON, Telekom IoT Service Button and many other SCADA and MES * From any systems capable of sending email or calling a webhook * Using Amazon Alexa (voice recognition) * In-app 1-click alert trigger with automated geo-location * Use your web browser to send alerts to your team Note: You need a SIGNL4 account to use this app and some features depend on your SIGNL4 plan. ## Key features - 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 ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/signl4-mobile-alerting/id1100283480/reviews.md ### 5/5 — Okay, fair play. *2022-11-09* They patched the issue I was having and quite quickly too. :) ### 4/5 — Why Only emergency *2020-11-03* Only emergency is bypassing do not disturb and silence. Why IT Is not??? How can we configure this? **Developer response:** Hi, you can set this for each alert category but you have to do this on each mobile app for each user separately. ### 5/5 — Super easy and effective! *2019-03-15* 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. ### 5/5 — SIGNL4 is how alerting should feel *2019-03-15* 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... ### 5/5 — Very effective app *2018-06-15* 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! ### 1/5 — Langue Signal4 *2018-05-25* Seulement en anglais ## Frequently asked questions about SIGNL4 ### 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. ## Version history (last 5 releases) ### 6.3.0 — 2026-08-18 We’ve made SIGNL4 even easier and more flexible to use: - Changed the login and sign-up process for a smoother experience - You can now flag your Signls for review - Various fixes and improvements ### 6.2.0 — 2026-07-07 New: You can attach images, videos or voice recordings to the Signl chat ### 6.1.3 — 2026-06-24 Minor fixes and improvements. ### 6.1.2 — 2026-06-11 - Fixed: Management of PTO/absences for people in user role not possible ### 6.1.1 — 2026-06-08 Various fixes and improvements. ## Apps similar to SIGNL4 | App | Rating | Price | Category | | --- | --- | --- | --- | | [Camp Organizer: Counselor](https://appshunter.io/ios/app/camp-organizer-counselor/id6502942047) | — | Free | Productivity | | [D4H Incident Management](https://appshunter.io/ios/app/d4h-incident-management/id1459233252) | 4.0 (8) | Free | Productivity | | [REDENES](https://appshunter.io/ios/app/redenes/id6449839600) | — | Free | Productivity | | [Sagan Command Center](https://appshunter.io/ios/app/sagan-command-center/id6746159171) | — | Free | Productivity | | [Tech Companion](https://appshunter.io/ios/app/tech-companion/id1644130354) | — | Free | Productivity | | [Ansible Semaphore Client](https://appshunter.io/ios/app/ansible-semaphore-client/id6458789575) | — | Free | Productivity | ## More apps by Derdack GmbH - [Derdack Enterprise Alert®](https://appshunter.io/ios/app/derdack-enterprise-alert/id986380399) All apps by Derdack GmbH: https://appshunter.io/developer/466792511 ## Related topics [alertcops](https://appshunter.io/ios/topics/alertcops) · [incident paging app](https://appshunter.io/ios/topics/incident-paging-app) · [mobile alerts](https://appshunter.io/ios/topics/mobile-alerts) · [fire alerting](https://appshunter.io/ios/topics/fire-alerting) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*