Hello, no, there is no app store. However, there are pre-installed programmes and libraries such as the Bond and PocketBook's own shop. As cloud storage there is Dropbox and the own PocketBook Cloud. And there is also a lame browser, but I don't think the device is really intended for surfing the internet ;-)
Hope the information is useful

Hello!
Pocketbook has a website where you can buy books and then the books will automatically be sent to your Pocketbook. You can use Dropbox and also send books to your own e-mail address.