Signl4

Signl4 is an alerting service, capable of sms/phone/mail/push-notification alerts, and managing oncall rotations.
The free tier supports unlimited push notifications.

Documentation

home	https://www.signl4.com/
signl4 webhook docs	https://connect.signl4.com/webhook/docs/index.html

Usage

- No API token is required to send a notification. A unique URL is provided for each team.
- Badges appear on app, indicating an issue
- Clicking on the red/orange circle shows each firing issue
   # click '?' to acknowledge, and try resolving

Setup

Can be configured both from app and web interface

# ios App
Settings Cog:
  - Signalling:
    - Push:            Instantly
    - Call:            Off
    - Text:            Off
    - Push Signal:     SIGNL4 - Notification
    - Critical Alerts: True