Onsen UI

Onsen UI is a development framework that allows you to build PWAs and hybrid apps with a native feeling to them. Written in JavaScript, this framework comes filled to the brim with components that automatically adjust their style based on the platform the app is accessed, which means that you can work on single source code to serve both iOS and Android users. 

Onsen UI is an open-source UI framework and components for HTML5 hybrid mobile app development, based on PhoneGap / Cordova. It allows developers to create mobile apps using Web technologies like CSS, HTML5, and JavaScript.