# Duetbook: Bilingual Audiobooks — Learn languages from any book

> Learn languages from any book (iPhone/iPad app by JUNICHIRO HORIKAWA.)

- Source: https://appshunter.io/ios/app/duetbook-bilingual-audiobooks/id6825625945 (this page in markdown: same URL + `.md`)
- Developer: [JUNICHIRO HORIKAWA](https://appshunter.io/developer/923898995)
- Category: Books, Education
- Price: Free with in-app purchases
- Age rating: 12+
- Requires: iOS 26.0 · 25 MB
- Languages: American English, Arabic, Dutch, French (France), German (Germany), Hindi, Indonesian, Italian, Japanese, Korean and 10 more
- Released: 2026-10-27
- Data updated: 2026-10-30

## What is Duetbook?

Duetbook is an audiobook player for people learning a language. Add an audiobook you own and Duetbook writes out what the narrator says, line by line, with a translation under each line. The word being read lights up as you listen.

You can start without an audiobook of your own: follow a podcast in the language you're learning from Apple's podcast directory, or browse free public-domain audiobooks from LibriVox by category. Each book shows how hard it is: the vocabulary it takes and how fast it's spoken.

LISTEN IN TWO LANGUAGES
• The transcript scrolls with the narrator and highlights each word. Tap a sentence to play from there.
• Show the original, the translation or both. Hide one and tap a line to check it.
• Have every sentence read aloud in your language too, before or after the original, at its own speed.
• Or play the original alone, and tap Translate for just the sentence you missed.
• Repeat a sentence until you catch it, or hear it again at 0.75×.
• Shadow: say a sentence along with the narrator and see which words were heard.

STUDY WHAT YOU HEAR
• Tap a word for its dictionary form, reading and meaning.
• A quiz of the new words you just heard: the ones you don't know come back with their sentence.
• Save sentences and words with their audio. The Review tab brings them back on a spaced-repetition schedule.
• Dictation: write what you hear, and Duetbook marks the words you missed or misspelled.
• Ask what a sentence and its words mean (Apple Intelligence, on devices that support it).
• Export a transcript as text, SRT, VTT or LRC subtitles, or a CSV for flashcard apps.

ON YOUR IPHONE AND IPAD
Transcripts come from the speech recognition built into iOS, and translations from Apple's translation, both on the device. Free downloads add Whisper, for languages Apple's speech recognition doesn't cover such as Arabic and Russian; natural voices for 17 languages, from Japanese and English to Arabic, Hindi and Vietnamese; and an AI model that translates the next few minutes again, reading the sentences around each one, even with the screen locked. Your books, your recordings and your voice are never sent to the developer.

On iPad, the transcript sits beside the cover.

AN AUDIOBOOK PLAYER FIRST
• MP3, M4A, M4B and other DRM-free audio files, from Files, a folder or a zip. A folder of tracks becomes one book with a chapter per file.
• Playback speed, a sleep timer that can stop at the end of the chapter, bookmarks and chapters.
• Widgets, the Lock Screen, Control Center, Siri and Shortcuts.
• Your library, listening positions and saved sentences sync with iCloud. Audio stays in your iCloud Drive.
• Podcasts: search Apple's podcast directory, follow shows and get transcripts and translations for episodes. Shows marked explicit aren't offered.
• EPUB and PDF books read aloud, in natural voices for 17 languages or the system voices.

FREE AND PRO
The player, transcripts, translations and each book's difficulty are free. Duetbook Pro is a one-time purchase that adds spoken translations, Translate, Shadow, the word quiz, unlimited review, dictation, explanations, the AI translation model and whole EPUB and PDF books read aloud. Try Pro free for 14 days, and share it with your family through Family Sharing. There is no subscription.

Audiobooks with copy protection (DRM) can't be added.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Duetbook Pro | $24.99 | one-time |
| 14-day Trial | Free | one-time |


## Is Duetbook safe?

Not enough ratings yet to assess Duetbook.

## Is Duetbook legit?

Duetbook: Bilingual Audiobooks appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Duetbook is 63 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 1.2.1 — 2026-10-30

• Transcribe Downloads While Charging now pauses while your iPhone is warm and goes on by itself once it has cooled down, so your iPhone stays cooler on the charger.
• AI Translation takes longer breaks while your iPhone is warm.

### 1.2 — 2026-10-29

• Translate (Pro): while the original plays alone, tap Translate under the transcript to hear the sentence you just heard in your language. The book then goes on from the start of that sentence. Or ask Siri: "Translate that in Duetbook".
• Word Quiz (Pro): tap Words for a card of each new word you just heard, and answer Know or Don't Know. The words you don't know come back in Review › Word Quiz with their sentence and its audio.
• Shadow (Pro): say the sentence along with the book and see which words were heard. Your voice is recognized on your device, and the recording isn't kept.
• Each book and episode shows how hard it is: the vocabulary you need for 95% of its words, and how fast it's spoken. Not yet for books in Japanese, Chinese, Thai or Hindi.
• What the transcript shows is switched with the eye above it now, rather than in Transcript Options; the translations' speed is in Playback Speed too.
• Settings › User Guide opens the new guide to everything Duetbook does.
• Clearer wording in several languages, and smaller fixes.

### 1.1 — 2026-10-29

• iPad: a layout of its own, with the transcript beside the cover, a sidebar, keyboard shortcuts, pointer support and drag and drop from Files.
• Natural voices for 16 more languages, a free download, for spoken translations and ebooks read aloud.
• Duetbook now speaks 20 languages: Arabic, Dutch, Hindi, Indonesian, Polish, Russian, Thai, Turkish, Ukrainian and Vietnamese are new.
• No audiobook yet? Start with a free public-domain classic from the empty library.
• See which engine translated each line, and have a whole chapter translated again by the AI model.
• Tap a sentence to play from it, and undo the jump if you didn't mean it. Sentence numbers can show in the margin.
• Discover has Podcasts and Audiobooks: browse LibriVox's free audiobooks by category, and sort them by popularity, newest, length or title.
• The AI translation model is new and runs on the Neural Engine: it keeps translating with the screen locked, or only while Duetbook is open if you prefer.
• Hold a sentence to see everything you can do with it at once, including having it translated or spoken again.
• Choose the colors of the AI's and Apple's translations, and see which translations are already spoken.
• Smoother scrolling through long transcripts.
• Turn iCloud sync off and delete caches in Settings.
• A large Last Played widget, and many smaller fixes.

### 1.0 — 2026-10-28

No release notes.

## More apps by JUNICHIRO HORIKAWA

- [AR GRAPHY](https://appshunter.io/ios/app/ar-graphy/id1625342347)

All apps by JUNICHIRO HORIKAWA: https://appshunter.io/developer/923898995

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-30.*