Origami vs Pop: What are the differences?
What is Origami? A free design prototyping toolkit for Quartz Composer. Origami is a free toolkit for Quartz Composer—created by the Facebook Design team—that makes interactive design prototyping easy and doesn’t require programming.
What is Pop? 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.
Origami and Pop can be primarily classified as "Mobile Prototyping & Interaction Design" tools.
Origami and Pop are both open source tools. Pop with 19.7K GitHub stars and 2.9K forks on GitHub appears to be more popular than Origami with 3.35K GitHub stars and 467 GitHub forks.