Support of mobile platforms is important feature of HSL-NG development. Desktop HSL have responsive design but we are also working on special mobile application using Apache Cordova framework. Current version brings big part of HSL functionality (e.g. compositions, layer manager, search). One of goals is to enable collection of data in terrain (VGI) for projects based on HSL-NG.
You can check current code on Github or test first version on Android device with Google Play (other platforms won´t be supported in current development phase).