This application gives you free recharge if you download apps from it. But it depends on your luck. If you are lucky enough you will surely get it.
Very often they don’t give a single penny for the apps which you have downloaded. Plus they insist you to keep the app for 7 days or so inorder to earn more.
But trust me no matter what smartphone you are using whether it has 2 gb ram or even more, your phone will hang for sure if you are storing more number of apps in it. I would never recommend it.