book·du·et

All Blue

About this app

Read one story in two languages, side by side, and understand every word of it.

Book Duet pairs a language you know with one you're learning. The original and its translation sit next to each other, page by page, so you always know where you are.

A simple app with extreme depth: 980,000+ words × 27 languages to match them in × 28 languages to explain them in = over 740 million word explanations.

EVERY WORD, EXPLAINED
• 980,000+ words across 31 stories, each with its own lesson.
• Tap a word: it and its real counterpart in the translation light up together.
• Hold it: see what it means in this passage, how it's used, and how its match in the other language corresponds.
• Whole expressions too: idioms and fixed phrases are matched as phrases, not word by word.

28 LANGUAGES, ANY PAIR
• Read in any of 28 languages and pair it with any other.
• Explanations come in your own language, whichever pair you choose.
• Every word is linked to its counterparts in all the other languages through the same carefully aligned stories.
• Japanese and Chinese show readings above the text when you want them.

READ YOUR WAY
• 31 classic stories with reading levels, from beginner to upper intermediate.
• Listen to a passage, or read with quiet rain, ocean or bell sounds.
• Six reading themes, from paper and sepia to night, and three text sizes.

One purchase. No subscription. No ads. No account. All offline.
New books and translations keep arriving over time.

Languages: Arabic, Chinese (Simplified and Traditional), Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Romanian, Russian, Spanish, Swedish, Thai, Turkish, Ukrainian, Vietnamese.

What’s new

book·du·et: read one story in two languages, side by side. 31 complete stories in 28 languages, a lesson for every word in its passage, two-page spreads on foldables and tablets, narration, and paper themes.