OneSignal

OneSignal is the market-leading customer messaging and engagement solution that supports Unity. OneSignal provides a Unity SDK, REST API, and a dashboard for Unity developers to deliver effective mobile push notifications, in-app messages, SMS messages, and emails.

OneSignal was originally founded by Unity game developers and has grown to be used by over one million businesses and tens of thousands of game developers to deliver over 8 billion messages each day.

By providing an open API, extensive documentation, free accounts, and intuitive personalization and analytics tools, OneSignal helps businesses of all sizes easily send effective messages to users of their mobile apps or games.