The CometChat SDK is designed so that it can be seamlessly integrated and used with your existing application (iOS & Android app written in native code). The simple mobile chat API has an intuitive flow which makes the entire process hassle-free. Use CometChat SDK and send/receive messages on your existing mobile application.

For more detailed information visit the below links:

Android Chat SDK
iOS Chat SDK
Cordova/Ionic/PhoneGap Chat Plugin