Do not pick one POD platform as if it has to do every job. Use the channel for what it is good at: Amazon for Amazon buyers, IngramSpark for wholesale reach, and Books.by for the readers you bring yourself.
KDP is best for Amazon marketplace demand. IngramSpark is best for trade distribution. Books.by is best when you own the traffic and want customer data, storefront control, ISBN support for eligible Books.by books, fast payouts, and stronger direct-sale economics.
Print-on-demand is production infrastructure. Your publishing strategy should start with the reader path, not the printer's rate card.
KDP belongs in almost every author's stack because readers already search Amazon. The trade-off is clear: Amazon owns the checkout, customer relationship, and payout timeline.
Bookstores and libraries generally buy through wholesale channels. IngramSpark is often the pragmatic route, but wholesale discounts and returns can make the royalty thin.
If a sale came from your newsletter, podcast, social post, launch event, classroom, or speaking work, sending that reader through a marketplace gives away margin and data you earned.
QR codes, landing pages, and signed-copy campaigns work best when they end on your storefront, not a generic product page competing with ads and similar books.
Print, shipping, card processing, and platform costs all matter. The useful number is what reaches your account after those costs.
Set trim size, margins, bleed, embedded fonts, and image resolution once. A clean print PDF can travel across KDP, IngramSpark, and Books.by.
Each format needs its own ISBN. Books.by can support ISBN assignment for eligible books published on Books.by; author-owned ISBNs can still make sense if your imprint is central to the brand.
Direct storefront sales give you customer data, campaign measurement, and a checkout built around your book rather than a marketplace search page.
Books.by gives authors a direct storefront, print-on-demand fulfillment, ISBN support for eligible books, customer data, and Stripe-powered payouts.
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