Xcode is the best program for iOS app development as it is Apple’s official IDE. It provides a comprehensive set of tools for designing, coding, testing, and deploying apps for iPhones, iPads, and macOS devices.

Android Studio is the most commonly used program for Android app development. It offers an integrated environment for coding, testing, and debugging apps with built-in emulators and a range of developer tools.

Yes, cross-platform development tools like Flutter, React Native, and Xamarin allow you to build apps that run on both iOS and Android using a single codebase. These programs are popular because they reduce development time and cost.

For beginners, Flutter and React Native are often recommended. Flutter uses Dart, which is relatively easy to learn, while React Native leverages JavaScript, a language many developers are already familiar with. Both frameworks offer a simpler entry point for cross-platform development.

Yes, to develop and publish apps on the iOS App Store, you need a Mac computer with Xcode installed. However, you can use tools like Flutter or React Native on Windows or Linux for development, but you’ll still need a Mac to compile and submit the app to the App Store.