Installing apps from sources other than your trusted app store can be risky and restricted by smartphone manufacturers. Cydia Impactor is a Graphical User Interface (GUI) tool that allows users to install IPA files on iOS and APK files on Android. It also offers advanced features such as flashing and updating Custom and Stock ROM, sideloading software for both jailbroken and non-jailbroken devices, and installing Tweaked apps and Hacked games on iOS devices. It is easy to install and does not affect the current iOS version running on your phone. However, it requires iTunes for iOS devices and USB drivers for Android devices.