Boost+

Sometimes you can’t really tell if speed boosters actually help improve your phone’s performance, but Boost+ is well worth a try, considering that it comes from a big company and it’s quite a small app. Boost+ comes with tools for cleaning junk files and deleting cache items, installers and temporary files from your phone.
 
You can also remove apps running in the background with the tap of one finger and manage applications installed on your phone. If you don’t want anyone else to access your apps, simply add a passcode to certain applications that contain personal information. The app has a smart boost tool for automatically clearing the memory on your phone and making the device run faster.