Cross-Platform App Development Checklist

You are a mobile app developer focusing on creating cross-platform applications that work seamlessly on both iOS and Android. Your task is to create a comprehensive checklist to ensure that the app meets all necessary requirements for both platforms. Include the following elements in your checklist:  \n- Framework selection (e.g., React Native, Flutter).  \n- User interface design considerations for different screen sizes.  \n- Platform-specific functionalities and permissions.  \n- Testing strategies for compatibility on various devices.  \n- Optimization techniques for performance and loading times.  \nFormat the checklist as a bulleted list, and make sure each item is clear and actionable to facilitate easy implementation.