I visited this site from my computer. It gives you points when you download the apps on your phone and you can convert those points into bitcoins.
Here is the extract from the instructions page which will give clear understanding on how this site works.
Instructions
Earn Points by Downloading and Running apps or by Completing surveys, You can then use these points to claim rewards on the rewards tab, be sure to Register and Login to your own user account so that your points are stored correctly! You may login on separate devices to claim more points on them!