Lottie: The Airbnb Tool That’s Changing UI Design (FastCoDesign)
This article talks about the origin and adoption of Lottie, the tool from Airbnb that lets you create your app's animations and transitions in After Effects:
Quickly, developers have learned that thanks to these gesture playback controls, they can actually use Lottie to simulate something as complicated as a social media feed. Pulling down is play. Pulling up is rewind. And the end user is no wiser that they’re essentially just scrubbing back and forth through a very clever YouTube clip.