One of the most recognized choices may be Amazon Kindle, but Onyx BOOX is becoming a more popular choice for bookworms. Onyx BOOX offers a selection of e-readers that also function as a tablet, allowing users to download apps from the Google Play Store. All of BOOX's e-readers run off the Android operating system and come with the app store pre-loaded. It comes loaded with the Neoreader app, BOOX's native reading app. However, as it does have the Play Store, you can download another reading app of your choice for increased versatility, unlike Kindle.