A CoolDroid launcher app is a software application designed for mobile devices, primarily smartphones and tablets, to customize and enhance the user interface experience. It serves as the default interface that users interact with upon unlocking their device or pressing the home button.

Home launcher apps provide a range of functionalities and customization options, allowing users to personalize their device's home screen, app icons, widgets, wallpapers, and more. Users can organize their apps into folders, arrange them in a grid or list format, and access various system settings and features directly from the home screen.