In addition to being paid, it is unusable because there is no file management. The app only using txt files, it scans the entire Kindle .... I can tell you that you end up with a ton of unnecessary files and not sorted.
No possible playlist, or a file management.
No backup can zoom and scroll speed.
So go your way, and take Google Chrome to get the free program Easyprompter Easyzic.com is great ..... but you have to remember that does not support Kindle Chrome .....
Away !!!