It depends almost entirely on your genre. KDP Select requires you to sell your ebook exclusively through Amazon for 90 days, in exchange for Kindle Unlimited page-read income and a few promotional tools. In heavily-read genres — romance, thriller, LitRPG, cozy mystery — KU income often exceeds what going wide would earn. In literary fiction, most non-fiction and children's books, the exclusivity usually costs more than it pays.
Exclusivity on the ebook only, for 90 days, auto-renewing unless you turn it off. During that window the ebook cannot be sold on Apple Books, Kobo, Google Play, Barnes & Noble, your own website, or anywhere else — including as a free download.
Print and audiobooks are unaffected. You can be in KDP Select for the ebook and still use IngramSpark for paperback.
Select tends to win where readers consume voraciously and price-insensitively: romance and its subgenres, thrillers, urban fantasy, LitRPG, cozy mystery, military sci-fi. Readers finish a book in two days and start the next. Page reads compound, and a series can earn far more from KU than from unit sales.
Wide tends to win where: the audience skews to non-Amazon devices (Apple Books, Kobo — strong in Canada, Japan and much of Europe), the book is reference or non-fiction read in fragments rather than cover to cover, you sell direct to your own list, or libraries are a meaningful channel.
Run Select for one 90-day term, then compare total ebook income per month against a wide term of the same length. Not page reads versus units — total money.
Most authors find the answer is clear within two terms, and it is often not the answer they expected.
Exclusivity concentrates your entire ebook business in one retailer's hands. If that retailer changes terms, adjusts the fund, or suspends your account, there is no second channel. Building a Kobo and Apple readership is slow and only compounds if you start.
That is a real cost, but it is a long-term one — and an author whose KU income is paying the bills today is entitled to weigh it accordingly.
Program terms and fund rates change. Verified 9 August 2026.
Publishing Database