In one embodiment, a method includes displaying one of a number of graphical user interfaces (GUIs) of one or more applications as a card on top of a card stack. One or more of the cards in the card stack corresponds to a GUI of a home screen of the computing device. Each of one or more of the cards in the card stack corresponds to one of the GUIs of an application. The application controls presentation of their GUIs as cards in the card stack. The method also includes receiving user input to display another one of the GUIs as the card on top of the card stack; and, in response to the user input, displaying the other one of the GUIs as the card on top of the card stack.