Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for presenting a first application's interface within a second application's interface. One of the methods includes receiving, by an active application executing on a user device that is not an application store, digital content referencing a second application not installed on the user device; obtaining application store data for the second application; providing, a user interface of the active application, the digital content with an application store user interface that includes (i) the application store data for the second application and (ii) an install element for triggering installation of the second application on the user device from within the active application; detecting user interaction with the install element; and in response to detecting the user interaction with the install element, triggering a download of the second application independent of launching an application for the application store.