Signalgrid

Signalgrid is a realtime push-notification service that offers reliable and secure alerts across all your devices.

Send notifications to mobile devices, e-mail, web, or API endpoints, organize them into channels, and control when and how alerts are delivered. With time-based rules and optional critical notifications, Signalgrid ensures important messages are never missed.

Free version includes:
10.000 notifications per month
Up to 3 devices
All standard notification features

Single version:
Unlimited notifications per month
More devices and endpoints
Critical notifications that bypass silent mode

Teams version:
Unlimited notifications per month
Even more devices and endpoints
Critical notifications that bypass silent mode
Teams collaboration features

Signalgrid is ideal for developers, teams, and anyone who needs dependable alerts without unnecessary noise.

Terms of service:
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Privacy policy: 
https://signalgrid.co/privacy.php