You earn a point for making a review and lose when you receive one. The more you reviews you make, the more reviews you get. It even works for paid apps. Their point system comes as money-spent systems. If you have a $3 app, you need to spend the same amount in another app to get your app reviewed.
While other leading review exchange platforms give unlimited app slots for free, Smoothreviews charges you $3.99 for the fourth and succeeding app slots.
Since people get to review minutes after downloading an app, which they usually do, they really have not explored the app well enough to make reliable reviews.
Initially, free users get two free app slots. For ever active referral, you get one free app slot. There is no limit as to how many free app slots you get as long as you keep getting active referrals.
You earn a point for each review you give, and those points are equivalent to the reviews you get. The more you reviews you make, the more review you get.