OneSignal
OneSignal is a customer engagement platform that provides push notification, email, SMS, and in-app messaging services for web and mobile applications. It enables developers to send targeted, automated messages to users across multiple channels to improve user retention and engagement. The platform offers SDKs for various platforms, including iOS, Android, web, and Unity, along with APIs for integration.
Developers should learn OneSignal when building applications that require user engagement features, such as sending push notifications for updates, promotions, or alerts. It is particularly useful for mobile apps, e-commerce sites, and SaaS products where timely communication can drive user activity and retention. The platform simplifies cross-channel messaging with scalable infrastructure and analytics, making it ideal for startups and enterprises alike.