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kdpbook.io vs Bookwiz: an honest comparison

Bookwiz is an AI writing room for novels and non-fiction, free for up to 3 books and from $14/month: its assistant keeps the whole manuscript in context, and every plan exports a reflowable EPUB, a print PDF, a DOCX and a full-wrap paperback cover. Its children's page says it doesn't generate picture-book illustrations. kdpbook.io writes 36 book types, illustrating the ones that call for art, offers 16 paperback and 5 hardcover trims, and exports fixed-layout Kindle files for picture books and comics.

By kdpbook.io editorialPublished

We make kdpbook.io, so we’re not neutral. Everything about Bookwiz below comes from its public pages as of (each row links its source); prices and features may have changed since. Spot an error? Write to contact@thevibecodingagency.fr.

At a glance

kdpbook.io compared with Bookwiz
Criterionkdpbook.ioBookwiz
Main jobWrites and illustrates the book, or lays out your own manuscript, then builds the KDP filesAn AI writing room for novels and non-fiction, with a Publish Kit for KDP source: Bookwiz page for “Main job” (opens in a new tab)
Writing the bookPlans and writes the whole book from one chat (a novel runs 55,000–120,000 words), or imports your manuscriptAn outline from one sentence, then chapters drafted with an assistant that keeps the whole manuscript and your notes in context; Claude, GPT or Gemini per prompt source: Bookwiz page for “Writing the book” (opens in a new tab)
Your own manuscriptImport a .docx, .doc, .pdf, .txt or .md file (or paste the text) for 20 of the 36 book types; your words are laid out as written, never rewritten.docx, .txt or .md (or pasted text), up to 10 MB, split into chapters from its headings; a PDF has to be converted first source: Bookwiz page for “Your own manuscript” (opens in a new tab)
OutputInterior PDF, full-wrap cover PDF, Kindle EPUB + Kindle cover, and a KDP listing sheetReflowable EPUB, print-ready PDF, DOCX and a full-wrap paperback cover, on every plan including Free source: Bookwiz page for “Output” (opens in a new tab)
Print interiorTrim, bleed, margins, spine and page limits applied automatically, with a preflight checkA print-ready PDF sized to your trim with gutter margins set; trim sizes not documented source: Bookwiz page for “Print interior” (opens in a new tab)
Hardcover5 hardcover trimsNot documented: its pages describe a paperback cover source: Bookwiz page for “Hardcover” (opens in a new tab)
CoverFull-wrap cover PDF sized from trim, paper and final page countFront, spine and back as one wrap, the spine from the page count and paper stock source: Bookwiz page for “Cover” (opens in a new tab)
Kindle eBookKindle EPUB (reflowable or fixed layout) + Kindle coverReflowable EPUB; fixed layout not documented source: Bookwiz page for “Kindle eBook” (opens in a new tab)
Illustrations61 illustration styles or your own; character reference sheets reused on every illustrationCovers only: its children's book page says it doesn't generate picture-book spreads or illustrations source: Bookwiz page for “Illustrations” (opens in a new tab)
Book types36 book types, from board books to novels, cookbooks, puzzle books and comicsNovels, series and non-fiction (memoir, how-to, business); children's text from early readers to chapter books source: Bookwiz page for “Book types” (opens in a new tab)
ListingListing sheet: title, description, 7 keywords, categories and AI-disclosure answersAI listing pack (keywords, categories, blurb) and price recommendations, on paid plans or with the $79 pass source: Bookwiz page for “Listing” (opens in a new tab)
KDP uploadOn a paid plan, kdpbook Publisher, the free kdpbook.io extension for Chrome or Edge on a computer, fills your Amazon KDP draft from your export (details, categories, files and prices); you review it and click Publish yourself.You upload to KDP yourself, guided step by step; its FAQ says Amazon has no publish API source: Bookwiz page for “KDP upload” (opens in a new tab)
Languages34 KDP-supported languagesNot documented; its About page lists multi-language support on its roadmap source: Bookwiz page for “Languages” (opens in a new tab)
PricingFree: 2,000 credits once, no card. Plans $25–$99/monthFree; $14–$99/month or $140–$990 a year; $79 once for one book source: Bookwiz page for “Pricing” (opens in a new tab)

What Bookwiz is

A browser writing room with an AI assistant that has read your whole manuscript and your notes. You describe the book in a sentence, accept the chapter outline it drafts, then write chapter by chapter with Claude, GPT or Gemini, switching models per prompt; you can also import a draft. When the book is done, its Publish Kit exports a reflowable EPUB, a print-ready PDF, a DOCX and a full-wrap paperback cover, makes an AI cover from a mood you describe, and on paid plans writes an Amazon listing pack (title options, 7 keywords, BISAC categories, a description and a price).

Where it shines

  • An assistant that has read the whole manuscript and your notes, so you don't re-paste chapters into a new chat.
  • KDP-ready export on every plan, Free included: a reflowable EPUB, a print PDF, a DOCX and a full-wrap paperback cover.
  • Claude, GPT and Gemini in the same book, switched per prompt (Claude Sonnet, Claude Opus and Gemini Pro on paid plans).
  • A $79 one-time pass for a book you already wrote: the listing pack, a launch kit and a zip of the KDP files, with no subscription.
  • Your books stay yours: its terms leave you full ownership (AI suggestions become yours when you accept and use them), cancelling or downgrading never deletes a book, which still exports as an EPUB, print PDF and DOCX on the free plan, and a 30-day money-back guarantee covers the first subscription and each pass.

Bookwiz pricing

  • Free: up to 3 books, 8 prompts a month on fast models, 30 inline autocompletes a day and 100 MB of storage, with KDP-ready export; no card.
  • Explorer $14/month or $140/year (unlimited books, 100 Pro prompts a month, the AI listing pack); Storyteller $35 or $350 (500 Pro prompts, unlimited Base prompts, KDP pricing and publishing recommendations); Professional $99 or $990 (2,000 Pro prompts, listing packs for a whole catalog).
  • Publish this book: $79 once for one manuscript (listing pack, launch kit and a zip of the KDP files); you still upload and publish on Amazon yourself.
  • A 3-day free trial on monthly plans (its terms say a trial needs a card); 30-day money-back on the first payment of a first subscription and on each pass.

As published on October 20, 2026. See the current prices on its website.

Which one should you choose?

Choose Bookwiz if…

  • You're writing a novel or non-fiction book yourself and want an assistant that has read every chapter.
  • You want KDP files before you pay: its pricing page lists the EPUB, print PDF, DOCX and wrap cover on the free plan.
  • You have one finished manuscript and would rather pay $79 once for its listing and files.

Choose kdpbook.io if…

  • Your book is illustrated: picture books, comics, cookbooks or coloring books, with characters that look the same on every page.
  • You want a published trim list: 16 paperback trims plus custom sizes, and 5 hardcover trims.
  • You want a fixed-layout Kindle edition, or print interiors such as puzzle books and journals.
  • You want KDP's AI-disclosure answers pre-filled on the listing sheet from how much of the text and art the AI made.

Questions

Is kdpbook.io a Bookwiz alternative?

For KDP books, yes, with a different focus. Bookwiz is a writing room: you draft with an assistant that has read the whole manuscript, and every plan exports an EPUB, a print PDF, a DOCX and a wrap cover. kdpbook.io plans and writes the whole book from one chat or imports yours, illustrates it when the type calls for art, and exports the interior PDF and full-wrap cover for 36 book types, with a Kindle EPUB for the 22 that suit Kindle; a 336-page novel (about 80,000 words) is estimated at about 5,377 credits (≈ $54), interior, cover and Kindle file included.

Does Bookwiz make picture books?

It writes the text, not the pictures: its children's book page says it drafts manuscripts from early readers to chapter books and doesn't generate picture-book spreads or illustrations (it does make covers). kdpbook.io writes and illustrates picture books with the same characters on every page, sets the text on the art and exports a fixed-layout Kindle EPUB; a 32-page picture book is estimated at about 1,614 credits (≈ $16), which fits in the free signup credits (free-plan files carry a preview watermark).

Is Bookwiz free?

It has a free plan: up to 3 books, 8 AI prompts a month on fast models and KDP-ready export, no card; paid plans run from $14 to $99 a month, as published on October 20, 2026. kdpbook.io gives 2,000 free credits once, no card, then paid plans from $25/month; free-plan files carry a preview watermark and aren't for sale.

Can I lay out a Bookwiz manuscript with kdpbook.io?

Yes. Export it from Bookwiz as a DOCX (any plan) and import it into a novel or another text book type: 20 of the 36 types accept an import, and words, punctuation and line breaks inside paragraphs are kept. Reading the manuscript costs 3 credits per 1,000 words, and the book's estimate (plan, layout, cover art) is shown before you launch.

Sources · read on October 20, 2026

We re-read every comparison at least every 90 days. Spot an error? Write to contact@thevibecodingagency.fr.

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