This blog post provides a comprehensive guide to creating both a React Native mobile app and a React web app within the same repository using Nx, allowing shared code between the two platforms. The example app, named Daily Horoscope, utilizes a tech stack comprising React Native for the mobile frontend, React for the web frontend, React Native Elements for UI components, Redux for state management, and React Navigation for navigation. It details the setup process, including environment configurations, creating components and libraries, integrating Redux for state management, and implementing React Navigation for screen transitions. The guide also covers integrating an external API for horoscope data and debugging Redux using redux-logger. Furthermore, it explains how to adapt the project to function as a web app using react-native-web, with adjustments for webpack configurations to support React Native components. The post concludes by highlighting the benefits of using Nx to maintain shared business logic across both mobile and web applications.