The OneSignal iOS SDK by OneSignal is for iOS applications in Objective-C language to use with the OneSignal API. The OneSignal REST API allows developers to access the functionality of OneSignal for integration with other websites and applications. OneSignal is a push notification service for mobile and web applications and websites.
Google today debuted ML Kit, a new software developer kit with five core APIs that gives mobile developers the power to instantly add machine learning to their apps all through Firebase. If you're looking to add some serious computational smarts to your app, this is the tool you need.