Codex AI Book Writer vs BookFoundry: Two AI Book Writers Compared
Published 31 October 2026. 3 min read.
BookFoundry and Codex AI Book Writer are both dedicated AI book writers: you describe a book and get a full draft back. Both run on the web and on Android, and Codex AI Book Writer is also on iPhone and iPad. They differ most in how you pay and in what they include. Here is a straight comparison, including where BookFoundry is ahead.
BookFoundry's details are taken from its own pricing page, checked on 31 October 2026. Prices change, so check bookfoundry.ai/pricing before you decide.
Side by side
| Codex AI Book Writer | BookFoundry | |
|---|---|---|
| How you pay | Per word, in tokens: about 1.3 tokens per English word. Packs of 10,000 for $5.99, 30,000 for $14.99, 100,000 for $29.99. | Per finished book, in credits: one book for $14.99, three for $29.99, sixteen for $99.99. |
| Free to start | 10,000 tokens on sign-up, enough to write a short book. No card. | Free tools and planning previews. No free book on its pricing page. |
| Subscription | None. Tokens never expire. | None on the web; credits never expire. Its terms also describe auto-renewing subscriptions for some purchases, such as through Google Play. |
| The outline | A chapter outline with word counts. You rewrite or delete parts before anything is written. | An outline generator and an editor where chapters can be added, deleted and reordered. |
| Export | PDF, Word (DOCX), EPUB and a web page (HTML). | EPUB, DOCX, print-ready PDF and a cover image. |
| Covers | Upload your own cover for PDF and EPUB. | Free cover designs included. |
| Languages | 7: English, Spanish, French, German, Italian, Russian and Norwegian. | 18, with regional variants. |
Which costs less for your book
It depends on length. Codex AI Book Writer charges for the words written, BookFoundry for each finished book.
- A 10,000-word lead magnet is about 13,000 tokens in Codex AI Book Writer: the free 10,000 plus one $5.99 pack. In BookFoundry it is one credit, $14.99.
- A 20,000-word guide is about 26,000 tokens: one $14.99 pack. The same as one BookFoundry credit.
- Several long books can come out cheaper per book in BookFoundry's larger packs, because the price does not grow with length. Its pricing page does not state a word limit per book.
Rewriting chapters uses more tokens in Codex AI Book Writer, so leave some room. You always see the estimated cost before a book is written.
When BookFoundry is the better choice
- You write in a language Codex AI Book Writer does not offer.
- You want cover designs and a print-ready PDF without making your own.
- You plan many long books and prefer a fixed price per book.
When Codex AI Book Writer is the better choice
- You want to try a whole short book before paying anything.
- Your books are short or medium length, where paying per word costs less.
- You want to approve and edit the whole outline before anything is written.
- You want a web page (HTML) version as well as the e-book and print files.
Publishing on Amazon KDP
With either tool, Amazon asks whether AI generated any of the text, images or translations, and a book drafted by AI counts as AI-generated even after you edit it. We explain the rules in Publishing an AI-Written Book on Amazon KDP.
Try it with your own idea
The free 10,000 tokens are enough to see the outline and a short draft for yourself. Start writing free.