kdpbook.io vs Atticus: an honest comparison
Atticus is a writing and formatting app sold for $147 once: it turns a manuscript you wrote into EPUB, PDF and DOCX files, but it doesn't write, illustrate or make the print cover. kdpbook.io writes and illustrates the book, or imports yours word for word in 20 of its 36 book types, then builds the interior PDF, the full-wrap cover and the Kindle file.
By kdpbook.io editorialPublished
We make kdpbook.io, so we’re not neutral. Everything about Atticus below comes from its public pages as of (sources at the end of the page); prices and features may have changed since. Spot an error? Write to contact@thevibecodingagency.fr.
At a glance
| Criterion | kdpbook.io | Atticus |
|---|---|---|
| Main job | Writes and illustrates the book, or lays out your own manuscript, then builds the KDP files | Formats a book you wrote, with a writing editor |
| Your own manuscript | Import 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 | Write in Atticus or import a .docx |
| Output | Interior PDF, full-wrap cover PDF, Kindle EPUB + Kindle cover, and a KDP listing sheet | EPUB, PDF and DOCX |
| Print cover | Full-wrap cover PDF sized from trim, paper and final page count | Not made in Atticus: its guide says the print cover is a separate PDF you create elsewhere |
| Full-bleed images | Full-bleed art where the book type uses it, sized to KDP's interior rule (0.125 in on the top, bottom and outside edge) | Full-page and chapter background images with bleed in print; images inside a chapter stay within the margins |
| Kindle eBook | Kindle EPUB (reflowable or fixed layout) + Kindle cover | EPUB; fixed layout not documented |
| Trim sizes | 16 standard paperback trims (no custom sizes); 5 hardcover trims | Trim picker color-coded for KDP and IngramSpark; full list not documented |
| KDP checks | Continuous KDP preflight in the editor: margins, bleed, image resolution, spine text, page count and listing | Default margins in each theme; a KDP preflight is not documented |
| Illustrations | 61 illustration styles or your own; character reference sheets reused on every illustration | You supply the images |
| Platforms | Web app in the browser | Windows, Mac, Linux, Chromebook (browser-based, works offline) |
| Pricing | Free: 2,000 credits once, no card. Plans $25–$99/month | $147 once |
What Atticus is
A writing editor and book formatter that runs in the browser as an installable web app on Windows, Mac, Linux and Chromebook, online or offline. You write in Atticus (word count, book goals, a writing-habit tracker) or import a .docx, pick one of its 17 preset themes or build your own, and export EPUB, PDF and DOCX.
Where it shines
- Fine typographic control: 17 preset themes, a custom theme builder, 1,500+ fonts, drop caps, header and footer options.
- Runs on Windows, Mac, Linux and Chromebook, and works offline.
- Writing and formatting in one app, with word-count goals and a habit tracker.
- A large-print setting that adjusts font, size, line spacing and alignment.
- One price with future updates included, no limit on books or pen names.
Atticus pricing
- $147 once, including all future updates; no monthly fee.
- 30-day money-back guarantee.
- Free trial: not documented on its home page.
As published on September 28, 2026. See the current prices on its website.
Which one should you choose?
Choose Atticus if…
- You wrote the book yourself and want hands-on control of every typographic detail.
- You'd rather pay once than use credits or a subscription.
- You want to write and format in the same app, including offline.
- You need a DOCX export.
Choose kdpbook.io if…
- You want the book written and illustrated, not only formatted.
- You have a manuscript and want the full-wrap cover built from its final page count, in the same project.
- You're making a picture book, comic or coloring book, or need a fixed-layout Kindle edition for a picture book.
- You want a KDP preflight and a listing sheet (title, description, 7 keywords, categories) with the files.
Questions
Is kdpbook.io an Atticus alternative?
For some books. Atticus formats a manuscript you wrote, for $147 once. kdpbook.io can also lay out your own text: import it for 20 of its 36 book types and it is used word for word, then kdpbook.io exports the interior PDF, a full-wrap cover sized from the final page count and a Kindle EPUB. If you only need formatting and want fine typographic control, Atticus is the simpler fit.
Does kdpbook.io rewrite an imported manuscript?
No. Imported text is split into chapters or pages and laid out; 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. If you wrote the text yourself and only the art is AI-made, KDP's content guidelines ask you to disclose AI-generated images, not AI-generated text.
Does Atticus make the paperback cover?
No. Its own guide says the print cover (back, spine and front) is a separate PDF that you don't create in Atticus. KDP's cover calculator, or kdpbook.io's free cover size calculator, gives the full-wrap size from the trim, paper and page count.
Sources · read on September 28, 2026
- atticus.io (opens in a new tab)
- Atticus: Calculate image size for print and eBooks (opens in a new tab)
- Atticus: Add images to your book interior (opens in a new tab)
- Atticus: Create a custom theme (opens in a new tab)
- Atticus updates (opens in a new tab)
- KDP Help: Content Guidelines (AI-generated content) (opens in a new tab)
- kdpbook.io, the AI book generator for KDP and kdpbook.io pricing
We re-read every comparison at least every 90 days. Spot an error? Write to contact@thevibecodingagency.fr.
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