Catalog - UI is an application for iOS developers and designers that provides a browsable collection of iOS UIKit components. The app includes standard interface elements such as buttons, menus, segmented controls, sliders, switches, steppers, text fields, search bars, and page controls. It also offers pickers, including date, color, font, image, and custom picker views, along with parallel demonstrations of key SwiftUI components. Users can tap any component to see a live demo of its behavior and appearance. The primary workflow involves browsing or searching for a component, viewing its live demo, and accessing its code snippet. The code can be copied directly into an Xcode project. Components can be filtered by tags such as UIKit, Controls, Views, Pickers, and SwiftUI. A Favorites feature allows users to save components for later reference. Catalog runs on iPhone and iPad and requires iOS 17.6 or later. The app is free to download and does not require an account. Catalog is built to keep data on the user's device wherever possible. The app may display ads through Google AdMob and use basic, anonymous analytics to improve the experience. Catalog does not sell personal data. Terms of Use and Privacy Policy documents are available through the app. The latest version is 2026.02.02, released on 2026-02-03.