Tweak UI is a free user interface customization application. It provides a simple graphical user interface for performing tweaks that otherwise would require editing the registry.

Tweak UI allows you to customise the user interface of the Windows operating system. Users with older, slower computers can turn off many aspects of the operating system's eye candy, such as fading menus, drop shadows, and cursor shadows.

Tweak UI also includes numerous features to customise the way the interface works, such as the taskbar and the desktop. The application also enables you to move the location of their Documents, Music and Pictures folders, as well as other system folders. It also includes various tools to repair elements of the operating system, such as icons, hot keys, the font folder, and file extension associations. It can be used to disable AutoPlay on one or more drives as well.