SD Maid is a program and document management tool which allows you to maintain your device clean and tidy! This program unlocks the"Pro" status in the free version of SD Maid, enabling all extra features. This isn't a stand-alone app. You still will need to install the free version of SD Maid. I don't mind a fast mail in case you have questions. If you are not pleased with your purchase, mail me over a week and request a refund.