7. Promo Codes:

Promo Codes is a very unique application, as it allows users to use their promo Codes as advertisement opportunity. For consumers, you download the app and once every 12 hours you check and see if you have got a promo code. If you have, then you have won a free app or some in-app purchases in an application. It’s a fun way to check out some apps and potentially even get some free ones.

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