There are many differences between Android and iOS apps. Android apps are written in Java, while iOS apps are written in Objective–C or Swift. Android apps can be developed on any operating system, while iOS apps must be developed on a Mac. Android apps are deployed to devices through an app store, while iOS apps are deployed through the iTunes store.

Android apps are typically designed for a wide range of devices with different screen sizes and resolutions. iOS apps are designed specifically for the iPhone and iPad. Android apps can be installed on any Android device, while iOS apps can only be installed on an iPhone or iPad. Android apps can be developed using any text editor, while iOS apps must be developed using Xcode.

Android apps can be compiled using any Java compiler, while iOS apps must be compiled using Xcode. Android apps can be signed with a self–signed certificate, while iOS apps must be signed with a developer certificate from Apple. Android apps can be deployed to devices without a developer certificate, while iOS apps cannot be deployed to devices without a developer certificate.

Android apps can be installed on devices without a Google account, while iOS apps cannot be installed on devices without an iTunes account.