An AvPlan EFB subscription allows you to run AvPlan concurrently on three (3) devices, which can be a mix of iOS and Android operating systems. For example: an iPad and two iPhones; or an iPad, an Android Tablet and an Android phone, or two iPads and an Android phone, etc.

In a business/enterprise context, we license AvPlan EFB by the number of users.

There is some more detailed info about how to manage your device count in the User Manual here and here.