AI Book Translation Services Compared: What Do Authors Actually Get?
Compare Kindle Translate, BookLingua, BookTranslate.ai, Luman Translation and Leanpub TranslateAI on pricing, deliverables, review and publishing support.
Written by Teddy Smith
BookLingua founder, author and host of The Publishing Performance Show
Table of Contents
- At a glance
- What should you compare besides price?
- Kindle Translate
- BookLingua
- BookTranslate.ai
- Luman Translation
- Leanpub TranslateAI
- Which service should you choose?
- Sources and checking notes
AI book translation services can all promise a translated manuscript, but that does not mean they deliver the same thing. One publishes a Kindle ebook directly. Another gives you a file to edit. Another checks page layouts. Some include human language review; others leave that decision to you.
This guide compares what five services say they provide, what you may need to do yourself, and which type of author each option suits.
How this comparison was prepared
This comparison is based on each provider’s published information, checked on 24 September 2026. Starting prices and features can change, so confirm the current scope and get a quote for your manuscript before buying. BookLingua is our own service; we have not independently tested every competing platform.
At a glance
| Service | Starting price shown | What you receive | Human review included? | Best fit |
|---|---|---|---|---|
| Kindle Translate | Free during its invite-only beta | A translated, formatted Kindle ebook that you can preview and publish through KDP | Amazon describes automated quality checks; it does not advertise a professional translator review | Eligible KDP authors who want a free Kindle-only route |
| BookLingua | $99 per language for up to 40,000 words | A translated manuscript, visible AI editorial changes, targeted professional translator feedback and market-specific launch materials | Yes, a professional translator reviews selected passages, not every page | Authors who want a managed path from manuscript to a new-market launch |
| BookTranslate.ai | Character-based quote through its calculator | Multi-pass AI translation, editorial tools and a marketing launch kit, according to its site | Check the scope of any human review in your quote | Authors who want detailed control over stylistic choices and to try a pilot |
| Luman Translation | From $100 per book per language | A formatted translated manuscript for further review and publishing preparation | Available as an optional, separately quoted service | Publishers and authors with their own editorial review process |
| Leanpub TranslateAI | $199 Standard or $499 Pro per language | A translated PDF and EPUB, automatically published as a separate Leanpub edition | Pro adds an employee’s review of every page’s layout and presentation; Leanpub says that reviewer need not speak the language | Authors already publishing through Leanpub, especially nonfiction authors |
Prices have different word-count limits and scopes. A starting price is not a like-for-like quote for your book. See the provider links at the end before making a decision.
What should you compare besides price?
Start by getting clear on your publishing plan. Do you need an editable manuscript? An ebook on Amazon? A paperback later? A launch description and keywords in the new language?
Then understand exactly what level of review is included. Are we talking about an automated quality check, a human layout check, targeted language feedback or a line-by-line professional proofread?
Both language and formatting matter. A sarcastic line could be translated into a polite statement, but you won’t spot that simply by looking at a neatly formatted page. On the other hand, a translated chapter heading could break an ebook’s navigation and make it difficult to read. Both require attention, but they need different checks.
Kindle Translate: a free route for eligible KDP ebooks
Kindle Translate is the simplest starting point if the option appears on your KDP Bookshelf. It creates formatted translations of eligible ebooks and allows you to preview and publish them through Amazon. The beta is free. Amazon says its quality threshold checks fidelity, idioms, terminology, grammar and other issues before allowing a translation to be published.
Access is by invitation, supported language directions are restricted, and you cannot directly edit the translated text within Kindle Translate at present. It currently creates Kindle ebooks, not print books or audiobooks.
If you already have access and only want a Kindle edition in a supported language, it could be an option for you. If you need to work directly on the translated prose or prepare a print edition, it might not work for you right now.
Read Amazon’s Kindle Translate beta information.
BookLingua: translation, editorial review and launch materials
BookLingua is built around a book-length workflow. You upload a DOCX, EPUB or TXT manuscript, choose a language and provide instructions about elements that need care. The manuscript receives an AI translation, a separate AI editorial pass and consistency checks. A professional translator then reviews selected passages where tone, idioms, dialogue or meaning need particular attention. BookLingua acts on relevant feedback and supplies the report.
You receive translated files and supporting material that helps you understand the editorial decisions and prepare the new edition. The Launch Pack includes a localised description, keywords, category and pricing suggestions, and a launch plan. Our published French and German case study shows the files and explains where reviewer feedback changed the final manuscripts.
For up to 40,000 words, the listed price is $99 per language; up to 80,000 is $149; and up to 150,000 is $199. It includes a targeted professional translator review, but this is not the same as a full-manuscript human proofread. Authors should still inspect their files and make the final publishing decisions.
BookTranslate.ai: a detailed AI editorial system
BookTranslate.ai offers a multi-pass AI translation process, a glossary to keep terms consistent and tools for reviewing stylistic suggestions. It also advertises a marketing launch kit and a paid pilot, with the pilot cost credited towards a full translation. Pricing depends on character count, so you will need a quote for your manuscript.
There is plenty to explore in its editing tools, but its public pricing page does not clearly establish whether a professional translator reviews any of the finished book. If human language review matters to you, ask exactly what is included before buying. Also check which files you can take away and edit.
BookLingua includes targeted review of selected passages by a professional translator and provides the review report as part of its standard package. We have not tested BookTranslate.ai’s translation quality.
See BookTranslate.ai’s pricing.
Luman Translation: a manuscript for your editorial workflow
Luman Translation offers formatted DOCX, EPUB and PDF output and describes its translation as a manuscript ready for editorial review, native-language proofreading or publication preparation. Its listed one-off prices begin at $100 per book per language, with tiers by length. Human review can be added, with the scope and price quoted separately.
Luman could be a good option if you have a publisher, editor or trusted language reviewer to take the file through the next stage. Check the precise price for your word count and whether the review you want is included in the quote.
Leanpub TranslateAI: an edition published on Leanpub
Leanpub’s TranslateAI translates a book into a separate Leanpub edition and publishes it as a PDF and EPUB. The Standard package starts at $199 per language, with up to 200,000 words included. The $499 Pro tier adds a person who checks every finished page for layout problems such as wrapping, tables and footnotes.
Having a human check the formatting is useful, but Leanpub explicitly says that the person reviewing may not speak the target language. Its page describes a presentation check, not a promise that a professional literary translator has read every sentence.
This is an especially natural fit for books already in Leanpub’s publishing workflow. If you have a Word or EPUB manuscript, check the required conversion first. Leanpub says you own the translations and may sell them elsewhere.
Which service should you choose?
- You have Kindle Translate access and want a Kindle ebook at no translation charge: try Kindle Translate and inspect the preview carefully.
- You want translation, targeted professional language feedback and help launching in the new market: compare BookLingua’s package and price for your manuscript.
- You want a multi-pass AI editing environment and a pilot on your own text: examine BookTranslate.ai and obtain an exact quote.
- You already have an editorial team to review the translated file: Luman’s file-based workflow may suit you.
- You publish on Leanpub and want an automatically created translated edition: compare Leanpub Standard and Pro, keeping the scope of Pro’s page review in mind.
Whichever route you choose, ask for a sample or inspect a complete passage, check recurring names and terminology, review the file on the device or platform where readers will see it, and make sure you understand who will handle the final language check. A translated book is a new edition with its own production and launch decisions.
Compare BookLingua for your manuscript