Techniques for previewing and presenting content of different applications in a user interface are described. In an example, a computer system determines a presentation template defined for a page application. The page application is configured to present a page about a target application, and the page includes a preview area and a body area. The system receives a user selection of an icon in a menu, whereby the icon corresponds to the target application. The system then presents in the user interface contents based on data stored in local memory, whereby the contents are presented according to an arrangement specified by the presentation template for the preview area. The system then receives a user request for additional information about the target application, and subsequently presents at least a portion of the body area of the page based on an execution of the page application.