React Native may be a good bet, while testing with an Android emulator. However, you won’t be able to build an app-store-approved iOS app without Xcode tools, w

React Native may be a good bet, while testing with an Android emulator. However, you won’t be able to build an app-store-approved iOS app without Xcode tools, which are not officially available on Linux. The CLI tools for building mobile apps are definitely not up to par with the IDEs though.