RC Developer Documentation

Starting March 27, 2026, RC is rebranded as Nexconn. Existing RC SDK customers can continue using this documentation. New customers should refer to the Nexconn developer documentation.

RC Documentation

A professional, simple, and reliable all-in-one communication solution. Providing SDKs for instant messaging, video conferencing, and audio/video calls with rich features and ready-to-use functionality.

Instant Messaging

Add instant messaging functionality to your application. Whether it's for customer support, social networking, or any other collaborative use cases, we can meet your needs.

Supports mainstream platforms and popular frameworks, saving you time and effort.

IMLib

The core capabilities SDK for instant messaging, a super-powerful SDK that supports one-on-one chat, group chat, chat room, and super group.

Android

iOS

Web

Flutter

React Native

IMKit

Accelerate development with our UI component library for Android and iOS platforms.

Android

iOS

Global IM UIKit

A globalized IM UI component library, based on in-depth research of IM applications, supports flexible configuration and customization.

Android

iOS

Web

CallKit

UI component library based on CallLib SDK, providing ready-to-use call UI components for voice and video calls.

Android

iOS

Server-side API Documentation

Integrate server-side management capabilities into your server by using our developer-friendly Server API. You can also utilize advanced extension features that are only available in the Server API.

We also provide a variety of server-side callbacks to support you in obtaining synchronized data from RC.

Learn about RC IM Server APIs →