Find a shopify app/theme name and where to buy

Hello, I found a store with an interesting feature, i tried many ways and wasn't able to detect if it's an app or a theme feature. I tried to find the theme and install it to test, but wasn't able to find it anywhere else. I will provide you the link of store with the feature i'm talking about, and you have to find me the name of app or theme, and provide me where to buy in shopify themes stores or apps store. Thanks,