Remember Oyster? It is a book subscription service that enables you to get access to thousands of books on your mobile device at any time. Its latest iOS app has been improved in various ways. The update not only fixes bugs and addresses performance issues, but it brings in-app purchasing option for Oyster subscription plans. You can buy Oyster credits for 1,6 or 12-month time periods.
The developers have added bookmarking to the app. You also get an improved Explore section and a “Recommended for You” section in Home. The app is compatible with your iPad too. You can download the latest version from the App Store.[Source]