1.     Heroku allows approved Add-On's (QG Static and QG Shield) to be Sharable Across Apps. But what does that even mean? 

  2.     It's pretty simple actually..."Sharable Across Apps" simply means you can use one QuotaGuard subscription (2 IPs) across as many applications as you wish.  You can decide that you want to make one per application or share them across multiple. 

        Keep in mind that unless you are getting an Enterprise plan or higher and specific request it, you are getting a set a shared IPs.  

       So if you want different IPs for every app, we can help you with that, but that doesn't necessarily mean they aren't used by other people.