JustPush.io

Instant notifications on all your devices. Perfect for developers and enthusiasts with easy integration via Open API and tons of packages.

You can send messages to the JustPush app, triggering push notifications for each one. Messages can include text, images, call-to-action buttons, and acknowledgment buttons to confirm receipt. You can also set an expiration time so the message doesn't last indefinitely.

Create a new topic and allow other users to join. A topic is a chat room where only the creator can send messages. The other members can only interact with your messages through the embedded call-to-action buttons.

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