“KU” is short for Kindle Unlimited. It is a monthly subscription service that Amazon offers for ebooks. For a flat fee, the subscriber has access to a huge number of Kindle ebooks in a variety of genres with no limits on how many can be read per month. But not all Kindle ebooks are included in KU, and there are strict requirements. KU has both advantages and disadvantages, particularly for indie authors like myself.
Requirements: To be available in KU, an ebook must be enrolled in KDP Select, which makes it exclusive to Amazon. It can’t be offered on another retailer site or even on the author’s own website. The enrollment period is 90 days and auto-renews by default. The book price must be in the range of $2.99 to $9.99 (U.S.).
Features: In addition to royalties from ebook sales, royalties are also paid to the author based on the number of pages read by KU subscribers. (From what I can tell, a “page” is about 200 words.) During each enrollment period, a book can be offered as a countdown deal or made free for up to five days.
My first book, Audrey of Farmerton, has been enrolled in KDP Select for nearly a year now, and the sequel, The Witch’s City, will be enrolled as well for at least the first 90 days. In my experience, countdown deals are utterly worthless. Making the book free, however, can be an effective way to get it into the hands of more potential readers, especially if you make an effort to advertise it. You won’t earn any royalties that way, but a successful free book promotion can result in increased sales and KU reads afterward. In fact, I’m seeing that right now from my last promotion.
Only recently have I realized that I make more money if someone reads my book through KU than if they purchase the ebook! The reason for this is that my book is an actual fantasy novel, not a novella or just a section of a longer work.
So how does one decide? As with many things, there is no one right answer. Some people claim that your book has to be widely available and that KU is unnecessary. But there are authors solely on Amazon who are making a nice living off of KU. My advice would be to experiment and see what works best for you. Happy writing.