It seems it might've been taken down but there used to be an app called ShopCats that was a crowd-sourced version of this concept https://shopcats.en.softonic.

It seems it might've been taken down but there used to be an app called ShopCats that was a crowd-sourced version of this concept https://shopcats.en.softonic.com/iphone https://shopcats.en.softonic.com/iphone