It's a ReactJS shell, which will be used as a website interface but designed to be responsive same as Jot Messenger - switching between 1/2/3 column modes. 

In the meantime, we ALSO work on ReactNative apps, which will provide ability to enable push notifications in iOS and will also give some native UI elements like side menu, launch bar, search box, etc. The trick is that when you're using the site features in WebView it may end up feeling not as smooth and fast as a native app, but if you're using a ReactJS frontend in WebView it would feel just like a native app. 

In other words - React JOT is NOT a mobile app per se, but it is part of the structure of the mobile app.