This is the preview app for the Bucks UI Kit that you can buy from here: https://www.epicpxls.com/items/bucks-ui-kit There is also a live demo and presentation page here: https://react-native-bucks.epicpxls.com/ You get Sketch files and Photoshop files with the app when buying.
Bucks UI Preview is an Expo project. Get started with your own project.