Microsoft has released Where's My App? for Windows Phone 7.x and 8 devices, a utility designed to help you find Windows Phone apps and games. Where's My App? will show you the app availability and if what you are looking for isn't available, Where's My App? will suggest alternatives to consider.
Where's My App? isn't intended to replace the Windows Phone Store but rather highlight popular apps that are available on other platforms as well as offering alternatives for those apps that haven't found their way to the Windows Phone Store.