The ChatOn app is an application that is offered by Samsung. The app was initially launched worldwide, but ChatON is only available in the US as of February 2015 due to Samsung shutting down availability. This was preceded by rumors of the shutdown, rumors that Samsung denounced as inaccurate.
At last count, ChatON had over 100 million users. While these are thought to be registered users rather than active users, Samsung has not confirmed what this count entails.
ChatOn is available for most major mobile platforms, including iOS, Android and Windows Phone for consumers in the United States.