By Brandon Withrow, Gabriel Peal, Leland Richardson and Salih Abdul-Karim 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
![Introducing Lottie](https://cdn-ak-scissors.b.st-hatena.com/image/square/dc6ccbc699f29ccb0de881cdc7542e15012f63f1/height=288;version=1;width=512/https%3A%2F%2Fmiro.medium.com%2Fv2%2Fresize%3Afit%3A1200%2F1%2APASOqnDQksOLAFjE5jEAGg.png)