MrPlanner is an app which let you organize your time during weeks, and having a scheduled calendar of free times, so it can remind you to read your favorite books which remained unread for a long time because of busy days,
In MrPlanner, you can specify your free times during a week, searching or importing your list of books from Goodreads, and making a plan for reading. The app will make a smart plan for your perusal and reminds you of your reading times.