App to Set Up Metered Paywall - Limit # of Free Posts Per Month

[shpfyuser]

Hi, 

I'm looking for an app that can set up a metered paywall on a Shopify site. For example, the functionality here would let me limit the number of free blog posts that a user can view per month. Similar to how Medium or the New York Times structure's their content site. 

Does anyone know of any ways to accomplish this on Shopify?

Thanks!