Setapp is a subscription service that offers access to a collection of over 240 apps for Mac and iOS devices. It includes an AI assistant to help users find the right app for their needs. With Setapp, users can search for apps, receive recommendations, and explore different categories. The service allows users to install as many apps as they want and offers a 7-day free trial. It also has a dedicated collection of AI apps to enhance productivity. Setapp aims to simplify app discovery and provide a convenient way to access a variety of useful applications.