jQuery Mobile vs. ComponentKit vs. Classy

jQuery Mobile is a HTML5-based user interface system designed to make responsive web sites and apps that are accessible on all smartphone, tablet and desktop devices.

ComponentKit is an Objective-C++ view framework for iOS that is heavily inspired by React. It takes a functional, declarative approach to building UI. It was built to power Facebook's News Feed and is now used throughout the Facebook iOS app.

Not CSS. Instead of trying to force UIKit to fit CSS syntax, properties, conventions and constructs. Classy is a stylesheet system built from the ground up to work in harmony with UIKit. It borrows the best ideas from CSS and introduces new syntax, conventions and constructs where appropriate.