Honest comparison
CoAuthor.ai pricing — and when you don't need a subscription
CoAuthor.ai is an AI suite for creating books from scratch — niche research, AI writing, covers, and publishing, sold as a monthly subscription with credits. If the book you want to publish is already written, you're shopping in the wrong aisle: publish.ai takes a finished manuscript and delivers the whole KDP launch package for a one-time payment.
| CoAuthor.ai | publish.ai | |
|---|---|---|
| Pricing model | Subscription: Essentials $65/mo, Pro $299/mo, Business $999/mo (25% beta discount at the time of writing: $48.75 / $224.25 / $749.25), plus monthly credit allowances | One-time per book: $29.99–$99. No subscription, nothing to cancel |
| What it's for | Creating books: niche research from Amazon data, AI outline and chapter writing, inline editing agents, covers, descriptions | Launching books you've written: validated EPUB, print-ready PDFs, six designed covers, Amazon listing copy, launch graphics |
| Writing the manuscript | Core feature — Pro writes up to 3 books/month with AI, Business up to 10 | Not included by design — publish.ai formats and packages your manuscript; the words are yours |
| Covers & creative | Metered by Creative Credits (60–500/month depending on tier) | Six genre-matched cover candidates included in every package — no credits, no meter |
| Cost for one book | At least one month of a tier that fits ($65–$299 at full price) — more if the book takes longer | $29.99 (ebook) to $99 (full author launch: ebook + paperback + hardcover + press kit), total |
| Your rights | Yours to publish | Yours entirely — no royalty share, flat one-time payment |
Where CoAuthor.ai is the better choice
An honest comparison cuts both ways. CoAuthor.ai genuinely wins if:
You want AI to write the book itself
That's CoAuthor's whole product: market research to pick a title that can rank, then AI drafting section by section with inline agents to strengthen the text. publish.ai deliberately doesn't write books — if you need the manuscript generated, CoAuthor is built for exactly that.
You're running a publishing operation, not writing one book
The Business tier's 10 book credits a month plus niche-research tooling is aimed at volume KDP publishers who treat books as a portfolio. A subscription amortizes well at that scale.
See exactly what you’d get — before paying anything.
We publish a complete real order — validated EPUB, covers, print PDFs, listing copy, launch graphics — for you to inspect file by file.
Common questions
How much does CoAuthor.ai cost?＋
As of September 2026, three subscription tiers: Essentials at $65/month, Pro at $299/month, and Business at $999/month, with a 25% beta discount (code BETA25) bringing them to $48.75, $224.25, and $749.25. Tiers differ mainly in AI book-writing credits (0/3/10 books per month) and Creative Credits for covers, ads, and trailers (60/300/500).
Is there a free trial or one-time option?＋
CoAuthor is subscription-only as of this writing — there's no one-time purchase. If you only need to publish one finished book, compare what a month or two of subscription costs against a flat $29.99–$99 package before committing.
When is publish.ai the better choice?＋
When the manuscript already exists. You upload a .docx and get back a validated EPUB, print-ready interior and cover PDFs, six designed covers, Amazon listing copy with keywords and categories, and launch graphics — one payment, no meter. When the manuscript doesn't exist yet and you want AI to write it, that's CoAuthor's territory.
Can I use both?＋
Sure — some authors draft with an AI writing tool and then want an independent, print-accurate launch package for the result. publish.ai doesn't care where the words came from, only that they're yours to publish.
Whatever you format with, our free tools work for every book: the KDP cover calculator, KDP royalty calculator, KDP manuscript checker, and more tools & guides.
Competitor details reflect publicly available information as of September 2026 and may change — check their site for current pricing. CoAuthor.ai is a trademark of its respective owner; publish.ai is not affiliated with it.