This perfect starter kit is an app based on React Native and UI Kitten library with Light and Dark themes support.
It’s completely free and Open Source. Compose the application from available screens, add backend integration and you will end up with A-grade cross-platform mobile application.
The themes can be changed in the runtime, without any need of reloading the application.
Download a live Demo published on both App Store and Google Play or simply run it yourself by cloning a GitHub repo.