Comparison

duoBooks vs Lingo7

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

duoBooks

Read any book in any language with instant translation and detailed word explanations. Build your vocabulary with a personal dictionary and spaced repetition tools. Improve pronunciation with audio voiceovers and master new languages through immersive bilingual reading.

Highlights
  • Instant translation of any book
  • Personalized vocabulary dictionary
  • Spaced repetition for memorization
  • Audio voiceovers for pronunciation
  • Bilingual parallel text reading
  • EPUB reader for custom files
Features
Read full description

Read any book in any language with instant translation into your native language. We offer short stories designed specifically for beginner language learners. Alternatively, you can add any book from your device and read with translation whatever you want. Break any sentence into clear pieces and see every word explained in context. Instantly understand how the sentence works, what each word means, and how it fits into the full translation. In our app, you will also have your personal dictionary where you can keep your vocabulary in one place and easily review it whenever you want. Mastering correct pronunciation is key to language acquisition. In our app, you can listen to audio voiceovers of every sentence or word to hear it pronounced accurately. Immerse yourself in language learning with ease. To learn words, we provide a Spaced Repetition tool. With it you can review words at increasing intervals, ensuring long-term retention and mastery. Swipe through word flashcards effortlessly to build a robust vocabulary and make memorizing words a seamless part of your daily routine. Build your English vocabulary. Many people who are not native English speakers use our app as epub reader to read scientific materials or programming books in English. As long as you have an EPUB file for what you want to read, our app is the best choice. Our bilingual book reader is designed to enhance your language proficiency one page at a time. Practice and study foreign languages by reading parallel texts where every sentence is translated into your native language. Reading books with translation is a proven method for language learners to improve their reading comprehension, expand their vocabulary, and gain a deeper understanding of grammar structures. Read with translation any EPUB ebook from your device, or choose from our library with 3000+ books and short stories. Reading enhances your creativity, imagination, and empathy. Moreover, reading has been shown to reduce stress, improve mental health, and increase our overall well-being. Dive into a world of dual-language storytelling. Don't just take our word for it - hear what our users have to say: "This app has revolutionized my language study! I use it with my own EPUB files in a language I am studying. The interface is intuitive. It's also very fast to use and provides a smooth experience during long reading sessions." Read in English, German, French, Spanish, Italian, or any other language, build your vocabulary, and improve your grammar skills. With our cross-language ebook reader, translate books on the fly and listen to voiceovers of any sentence or word in your book. Best bilingual reading app available. With duoBooks you will: - Take control of your language learning journey and achieve your goals faster and easier than ever before. - Improve speaking by listening to how words and phrases are pronounced correctly. - Easily incorporate reading into your daily routine and reap the numerous benefits of this powerful skill, all while you learn English (or other languages). - Read English books with translation (or Spanish, French, etc.) easily even if it's not your native language. - Study words with scientifically proven technique (Spaced repetition). Swipe word cards and enjoy the process. Smart Interval system is as effective for memorizing words as English lessons. duoBooks offers short stories specifically created for beginners. They use simple vocabulary, repetitive words, simple dialogues, and uncomplicated sentences. Alternatively, we have a vast selection of classic literature. From the works of Edgar Allan Poe to the novels of Jane Austen. With over 3000+ classic ebooks available and the ability to import your own files, you'll never run out of options to practice your language skills. Whether you're a beginner or an advanced learner, duoBooks is your app for language learning success. Start your journey today with our free language learning app!

About

Lingo7

Enhance foreign language skills through immersive reading, listening practice, and focused vocabulary building. Offers parallel translation, audiobooks, and smart flashcards for steady improvement at all levels. Perfect for travelers, students, and self-improvers.

Highlights
  • Parallel text translation
  • Audiobooks in target language
  • Smart flashcards for vocabulary
  • Built-in dictionary
  • Multiple language support
  • Progress tracking
Features
Read full description

Improve your foreign language easily, enjoyably and effectively! Take your language skills further through immersive reading, sharper listening practice and focused vocabulary work. The app suits all levels, especially if you already know the basics and want to keep advancing. English, German, French, Spanish, Italian, Portuguese, Serbian and Russian, choose your language and keep improving! Read with parallel translation Improve your comprehension by reading texts in your target language with instant translation alongside. The library includes classic literature, summaries of modern books, stories and texts for different difficulty levels. This approach helps you practice daily and expand your vocabulary naturally. Audiobooks in your target language Sharpen your listening skills with quality audiobooks: classics, modern retellings, short stories. You can listen while reading or switch to audio-only mode for full immersion, training your ear for authentic foreign speech. Smart flashcards for vocabulary improvement Expand your active vocabulary with intuitive flashcards and exercises. The app includes collections: 1000 words for steady progress, 3000 words for intermediate level and 5000 words for deeper mastery. These collections help strengthen your foundation step by step. Built-in dictionary Tap any word while reading to see its translation, definition and pronunciation. This keeps your reading smooth and uninterrupted, so you can focus on the content. Designed for steady improvement Whether you're polishing the basics or refining advanced fluency, you can practice reading, listening and vocabulary at your own pace. The app is perfect for travelers, students, professionals, self-improvers and people who've used Duolingo or similar apps. Why users love this app The app offers free features, a large library of parallel books and audiobooks, powerful tools for reading practice and vocabulary improvement, plus a simple and attractive interface. Keep improving your foreign language with an app that makes daily practice interesting, easy and effective! german, deutsch, alemán, allemand, tedesco, alemão, немецкий, немачки, duits, niemiecki, němčina, almanca, tyska, saksa, germană, γερμανικά, 德语, ドイツ語, 독일어, जर्मन, ألمانية, english, englisch, inglés, anglais, inglese, inglês, английский, енглески, engels, angielski, angličtina, İngilizce, engelska, englanti, engleză, αγγλικά, 英语, 英語, 영어, अंग्रेज़ी, إنجليزية, spanish, spanisch, español, espagnol, spagnolo, espanhol, испанский, шпански, spaans, hiszpański, španělština, İspanyolca, spanska, espanja, spaniolă, ισπανικά, 西班牙语, スペイン語, 스페인어, स्पेनिश, إسبانية, french, französisch, francés, français, francese, francês, французский, француски, frans, francuski, francouzština, Fransızca, franska, ranska, franceză, γαλλικά, 法语, フランス語, 프랑스어, फ़्रेंच, فرنسية, italian, italienisch, italiano, italien, итальянский, италијански, italiaans, włoski, italština, İtalyanca, italienska, italia, italiană, ιταλικά, 意大利语, イタリア語, 이탈리아어, इतालवी, إيطالية, portuguese, portugiesisch, portugués, portugais, portoghese, português, португальский, португалски, portugees, portugalski, portugalština, Portekizce, portugisiska, portugali, portugheză, πορτογαλικά, 葡萄牙语, ポルトガル語, 포르투갈어, पुर्तगाली, برتغالية, russian, russisch, ruso, russe, russo, русский, руски, russisch, rosyjski, ruština, Rusça, ryska, venäjä, rusă, ρωσικά, 俄语, ロシア語, 러시아어, रूसी, روسية, serbian, serbisch, serbio, serbe, serbo, sérvio, сербский, српски, servisch, serbski, srbština, Sırpça, serbiska, serbia, sârbă, σερβικά, 塞尔维亚语, セルビア語, 세르비아어, सर्बियाई, صربية Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

duoBooks4 screens
Lingo74 screens

Verdict

The call

duoBooks and Lingo7 both sit at 4.7 stars, but that hides the real split: 100% of Lingo7's written reviews are positive against 68% of duoBooks's. Lingo7 also leads on update cadence (every 2 days vs every 2 weeks). duoBooks's advantage is ratings volume (57 vs 6). On price, rating, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. duoBooks sells 11 in-app purchases, starting at $2.99 per month and Lingo7 sells 2 in-app purchases, starting at $5.00 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for duoBooks against 4.8 for Lingo7. That said, the two scores are not equally well evidenced: duoBooks has 57 ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 68% of duoBooks's written reviews are positive against 100% of Lingo7's.

UpkeepUpdate frequency

duoBooks ships an update every 2 weeks, Lingo7 every 2 days. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
duoBooks versus Lingo7: the parameters behind the verdict, then further details
ParameterduoBooksLingo7
PriceFreeFree
Rating4.7 (57 ratings)4.8 (6 ratings) — better
Positive reviews68.4% of reviews100.0% of reviews — better
Number of ratings57 — better6
Update frequencyEvery 2 weeksEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size53 MB89 MB
Age rating12+4+
DeveloperPlainProg LLCSeYu LLC

Customer experience

duoBooks

All ratings55 ratings
Positive94.5%
Neutral0.0%
Negative5.5%
Written reviews38 reviews
Positive68.4%
Neutral13.2%
Negative18.4%

Lingo7

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews10 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

11 purchases

duoBooks

Subscriptions5
  • Full Plan7 Days trial$2.991 Month
  • Full Plan3 Days trial$6.991 Month
  • Full Plan7 Days trial$17.991 Year
Show 2 more
  • 6 Month Full Plan3 Days trial$19.996 Months
  • Full Yearly Plan3 Days trial$29.991 Year
One-time6
  • War and Peace$0.99
  • Silver Blaze$0.99
  • On The River$0.99
Show 3 more
  • Clochette$0.99
  • The Fishing Hole$0.99
  • Alice in Wonderland$0.99
2 purchases

Lingo7

Subscriptions2
  • Monthly subscription$5.001 Month
  • Yearly subscription7 Days trial$30.001 Year

Questions

Is duoBooks free?
duoBooks is free to download, with in-app purchases available.
Is Lingo7 free?
Lingo7 is free to download, with in-app purchases available.
Which has better reviews, duoBooks or Lingo7?
Lingo7 is rated higher. duoBooks averages 4.7 out of 5 from 57 ratings, while Lingo7 averages 4.8 from 6 ratings.
Do duoBooks or Lingo7 have ads?
Neither duoBooks nor Lingo7 shows ads.
Which is updated more often, duoBooks or Lingo7?
duoBooks ships an update every 2 weeks, and Lingo7 every 2 days. Most recently, duoBooks was updated on October 29, 2026 and Lingo7 on October 30, 2026.

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