I'm using RN for managing data and navigation and JUCE for audio and custom animated views. Working well so far, after ironing out configuration issues. I've settled on wix/react-native-navigation for my navigation, pure JS navigation is just too slow on an iPhone 4S. I started in Objective-C, then moved to Swift and finally settled on RN partly so that I can easily port it to Android. React Native and Redux make a lot of sense to me now.