In the past, building complex animations for Android, iOS, and React Native apps was a difficult and lengthy process. You either had to add bulky image files for each screen size or write a thousand lines of brittle, hard-to-maintain code. Because of this, most apps weren’t using animation — despite it being a powerful tool for communicating ideas and creating compelling user experiences. One year
![Lottie](https://cdn-ak-scissors.b.st-hatena.com/image/square/dcefd290a8573c534a23787d301bcf07056cc5df/height=288;version=1;width=512/https%3A%2F%2Fairbnb.design%2Fwp-content%2Fuploads%2F2017%2F01%2Fbabu.png%3Fw%3D1024)