You have to manually download the books and place them in subfolders under the "My Audiobooks" folder on your phone.
Every book must be in a separate subfolder, even if it consists of only one file.
In Library→Settings→Root folder select the "My Audiobooks" folder.
Once finished, don't forget to press the "Update" button at the top of the Library window.
First 30 days Full version. Later - Basic version.
+ Playback speed control. It may be useful if narrator speaks too slow or too fast.
+ Classification of books (new, started and finished) allows you to understand at glance what books have been finished, what you are reading now and what are new).
+ Downloading cover from the Internet brings more life to the book than just blank general cover.
+ Bookmarks allow you to mark interesting moments in the book.
+ List of characters. You can manually create a list of characters to easier follow the story.
+ Automatic pause in case you fall asleep. To continue playback just shake your phone.
+ Playback history allows to return to the previous playback position in situation when you accidentally hit Next file or other button.
+ Chromecast support allows to listen the book on full size speakers.
+ Application Widget. Allows you to control the player from the home screen.
+ You don't have to finish one book to start another. The progress is saved independently for all books.
+ NO ADS!
To purchase full version press: menu--Help--Version tab.
Full version cost is $2 + tax.
It is a one time purchase. Not a subscription.
Many thanks to people who left comments and suggestions.
If you have something that doesn't work please write an email instead of leaving a comment.
Version for Android 4.4 - 5.1:
Version for Android 4.1 - 4.3:
Version with old icon: