You can make beautiful mobile apps with Onsen UI.io. This platform is best for creating new mobile apps with HTML5, CSS and Java Script. It is the most beautiful to build an HTML5 hybrid or mobile web apps. It also contains AngularJs, React, Vue libraries for framework users. There are lots of UI components available with Onsen UI that is specially designed for mobile apps. The automatic styling feature will change the appearance of the app according to its platform.