Are All Kindle Books Available on Kindle Unlimited?
No, not all Kindle books are available on Kindle Unlimited (KU).
Kindle Unlimited is a subscription service by Amazon that provides access to a specific selection of eBooks, audiobooks, and magazines. While many popular titles and works from independent authors are included, some books are not available in KU. Traditionally published books or those with exclusive distribution agreements are less likely to be available through this service. It is always best to check the KU catalog for the specific titles you are interested in.
Subscribing to Kindle Unlimited
Subscribing to Kindle Unlimited will give you free access to over a million Kindle titles, which include eBooks, audiobooks, and magazines. Kindle Unlimited titles can be read on any Amazon device or via the Kindle app. You can borrow titles as often as you want with no due dates and can keep up to ten at a time.
Kindle Unlimited and Book Availability
No, Kindle Unlimited does not include all books. Authors must opt-in to what is known as ‘Kindle Select’ for their books to become available to Kindle Unlimited subscribers. This opt-in period is 90 days and can be renewed indefinitely. If an author has one book in Kindle Select, anyone with a KU subscription can 'borrow' this book. Once the 90-day opt-in period ends, the book can no longer be borrowed through KU, unless the author decides to renew the opt-in.
To place a book in Kindle Select, an author has to agree not to publish it or make it available on other platforms such as Nook Books, iBooks, Smashwords, or Kobo during the time it remains in Select. Many authors, including myself, choose to place their new books in Kindle Select for one term and then remove them to publish in other venues.
Conclusion
Only those placed in Kindle Select are available on Kindle Unlimited. Many authors choose to place their books in Kindle Select for a limited time to maximize their earnings through Amazon, but many also publish their books on other platforms to broaden their reach and increase their readership.