Amazon's Freetime unlimited store is entirely ad-free apps, and bans in-app purchases, from what I can tell. It's only available on Kindle Fire devices, but it

Amazon's Freetime unlimited store is entirely ad-free apps, and bans in-app purchases, from what I can tell. It's only available on Kindle Fire devices, but it's a good option. (I think a big part of that is that you pay $3/mo for access) The versions of Angry Birds there are ad-free and in-app-purchase-free.