Our site (AppBrain) indexes which Android app contain which libraries. This doesn't indicate exclusive use of a framework of course, but the trend is very clear

Our site (AppBrain) indexes which Android app contain which libraries. This doesn't indicate exclusive use of a framework of course, but the trend is very clear that React Native is much more popular than Flutter. React Native has a number of 1 billion+ downloaded apps, whereas the biggest Flutter app is 1 million+. https://www.appbrain.com/stats/libraries/details/react_native/react-native https://www.appbrain.com/stats/libraries/details/react_nativ... vs https://www.appbrain.com/stats/libraries/details/flutter/flutter https://www.appbrain.com/stats/libraries/details/flutter/flu...