SmartMonitor plug-in displays text representing different parameters of your phone such as battery life, temperature, storage space and available memory. You can also add icons representing any of these things as you see fit. The plug-in is extremely configurable in that it allows you to place as many or as few bits on information on the screen, wherever you want with just a minor tweak of the XML file.

If you need Android app to clean storage and free memory from your phone, Clean Master is the one.
read more at the software documentations here