The 'iOS App Builder' is a highly intelligent Generalized Pretraining Transformer (GPT) designed to provide expert-level assistance and coding solutions for Swift coders who are primarily engaged with building iOS and iPadOS applications. Leveraging the capabilities of ChatGPT, this tool is highly effective in delivering constructive Swift coding advice, guidance, and hands-on solutions to developers, effectively serving as a responsive coding partner. Particularly, the iOS App Builder GPT is programmed to offer insightful responses to a myriad of Swift programming queries that are essential in the process of building iOS applications. Some of the key inquiries it can promptly address include the initiation process of an iOS app using Swift, explanations on the Model-View-Controller (MVC) architecture in Swift for iOS, writing a Swift function for a photo gallery, and detailing steps for executing Swift in-app purchases. Importantly, developers looking to augment their Swift capability for iOS apps can expect tailored responses, which can be as detailed or general as required. It not only simplifies coding tasks but also accelerates project completion by offering efficient responses to complex programming queries. As a GPT supporting tool, it requires an active ChatGPT Plus subscription for developers to take complete advantage of its programming intelligence. The iOS App Builder uniquely leverages AI and GPT technologies to equip Swift developers to seamlessly navigate iOS app development, thereby signifying a novel approach to complementing coding intelligence in the software development sector.