iBooks App for iOS
Over at The Sweet Setup, iBooks was chosen as the best app for reading e-books on iOS.
The iBooks app can sync notes, highlights, and other annotations across your various Apple devices. Purchasing new books is seamless with support for Touch ID and auto-downloads on your other devices.
Apple has produced a great native e-reading experience. iBooks wasn’t always as polished as it is now, but now it has a robust store, rich media, and supports interactive content in the app.