Microsoft releases Switch to Windows Phone app for Android users on Google Play which checks how many of your Android apps are available on Windows Phone and save your results so you can retrieve them later on your new Windows Phone and install the apps.
The app has been bombard with 1 star rating by Google Play users because "people want to know which apps will work with Windows Phone 8. A simple percentage is useless unless users are told which apps can also be found on Windows Phone 8", one of the reviewers posted.
It's fun to read user reviews. 
Read here: