I am a highly experienced and skilled iOS app developer with a deep understanding of developing applications that meet client requirements, including those with similar features to the App Store. My expertise in iOS app development, combined with my proficiency in user interface design and collaboration skills, make me a valuable asset to any project. To create an app similar to the App Store, I would use my knowledge in UI/UX design and Swift programming language. I can develop an app that includes the main features you are looking for, such as the ability to add, sign, and duplicate applications, activate users via UDID, update applications, and download custom apps. I will also ensure that the app has a simple and user-friendly interface with a distinctive shape. However, I have some technical questions regarding the project, which I will discuss with you in detail to provide you with an exact timeline and quote. I am confident that my expertise and experience in iOS app development will allow me to create an app that meets your requirements, and I am committed to delivering the highest quality work within the given timeframe. Let's have a conversation to bring your vision to life!