Just trashing still leaves a digital footprint of the app in the form of various support files on scattered all over your Mac. Indeed, it deletes the files and data associated with the app in a total clean sweep. AppCleaner for Mac is as close as you can get to a one-step solution that does more than toss unused apps in the Trash. While the Mac OS X makes it easy to install apps and easy to discard them, simply moving apps to Trash bin doesn’t always provide the clean slate you need.
AppCleaner Review – Uninstalling Done Right