Amazon KDP
Kindle Direct Publishing — the dominant self-publishing storefront for ebooks and print-on-demand. Optional KDP Select exclusivity unlocks Kindle Unlimited. Essential for most indies; not the only store if you go wide.
Distribution & aggregators
KDP, wide aggregators, and print networks that get your book into stores and libraries.
4 tools
Draft2Digital
Wide ebook (and print) aggregator that sends files to multiple retailers and libraries for a distribution commission. Includes automated formatting from Word. A common companion to KDP for authors who want Apple, Kobo, l…
IngramSpark
Print (and ebook) distribution via Ingram’s trade network — the channel bookshops and libraries often use to order. Higher bar for files and metadata than KDP; valuable when you want bookstore-friendly wide print.
Kobo Writing Life
Direct self-publishing to Kobo’s global ebook and audiobook storefronts. No exclusivity requirement; useful for Canadian and international reach and for authors building a non-Amazon presence.