To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
The app is quite frustating. Also it cannot hold the preview on screen. Keeps on changing, very annoying to check the camera you want to look, no matter how you set the preview for all the camera at once, but it can't stay.