Today the first version of AppMarkets.wiki was publicly released. The idea of the product is to provide up-to-date stats about saas marketplaces from the point of view of an application developer.
A list of 500 apps was selected as a starting point to explore the site. You can see the list here.
App page
Take a look at https://appmarkets.wiki/shopify/apps/free-shipping-bar
The app page provides information about category ranks, installations and ratings.
I hope you enjoy the site.