MIUI (which stands for MI User Interface and pronounced "Me You I"[citation needed], a play on the common abbreviation of the words user interface as UI), developed by Xiaomi, is an aftermarket firmware for cell phones based on the open-source Android operating system. It features a heavily-modified user interface that does away with the Android app drawer and has drawn comparisons with Apple's iOS.[citation needed] It includes additional functionality not found in stock Android, including toggles on the notification pull-down, new music, gallery, and camera apps, and an altered phone dialer that displays matching contacts as a user enters a number.[citation needed]