KDP is a great economic choice for both authors and book buyers. It is highly recommended for your project's fulfillment. If you do not have a purchased ISBN, KDP will provide you with one.*
Ingram Spark is recommended for hardcover fulfillment and for books with color. To publish with Ingram Spark, you need to purchase your own ISBN or use the free option provided by Ingram Spark.*
Additional ISBNs can be purchased through myidentifiers.com individually or as multiples. These will need to be purchased by the client before final fulfillment.
*Free ISBNs are registered to the print-on-demand platform, meaning the platform (KDP or Ingram Spark) will show up as the publisher on your book. For more on ISBNs, please see the "ISBNs + Publication Rights" page in our pre-publication guide.