Material vs Pop: What are the differences?

Developers describe Material as "A Graphics Framework for Material Design in Swift". Express your creativity with Material, an animation and graphics framework for Google's Material Design and Apple's Flat UI in Swift. On the other hand, Pop is detailed as "The extensible iOS and OS X animation library behind Facebook's Paper". Pop is an extensible animation engine for iOS and OS X. In addition to basic static animations, it supports spring and decay dynamic animations, making it useful for building realistic, physics-based interactions. The API allows quick integration with existing Objective-C codebases and enables the animation of any property on any object. It's a mature and well-tested framework that drives all the animations and transitions in Paper.

Material and Pop belong to "Mobile Prototyping & Interaction Design Tools" category of the tech stack.

Material and Pop are both open source tools. It seems that Pop with 19.7K GitHub stars and 2.9K forks on GitHub has more adoption than Material with 11K GitHub stars and 1.21K GitHub forks.