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52
BU Score
Solid

duoBooks: Читати з перекладом

4.5 ✍️ Editor
✍️ BU Analytics Review

duoBooks: Читати з перекладом is an iOS app from PlainProg LLC in the News category, currently rated 4.5★ across 28 ratings. Initial signal reads as mixed reviews — supporters praise core features while critics cite stability/value gaps.

Our BU Score puts it at 52Solid (established niche player). For a News app, that means established niche player.

Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.

creator

📊 Performance Tracking LIVE

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Rating
Reviews
Forecast Revenue / mo
Snapshots tracked
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since first record
Range:

💰 Forecast Revenue / mo

MODEL
Revenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 5 of 5 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
Multilingual (41 languages)METRIC
+$1,500
Good rating (4.5★)METRIC
+$800
Established app (5y old)METRIC
+$800
Ad-supported / freemiumMETRIC
+$600
Pre-traction phase (28 ratings)METRIC
−$300
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)

📈 Reviews Growth

LIVE
Cumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
May 24
Jan 25
Mar 26

⭐ Rating Trend

LIVE
Average rating evolution. Updates with each new review batch.

🗓️ Snapshot Timeline

HISTORY
Each bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →
💾 56 MB🔞 12+📱 iOS 15.0+🔖 v6.6🔄 updated 1d ago🌐 SQ, HY, AZ, BN, BG +36📂 News💰 Paid🚀 Launched 2020 (5y old)

📝 About this app

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!

🆕 What's New · v6.6

Improved audio quality
Minor improvements and maintenance

Profile & Insights

Everything we know — and don't — about this app and its company.

Identification

App name
duoBooks: Читати з перекладом
Developer
PlainProg LLC
Bundle ID
com.plainprog.duobk
App Store URL
Open in App Store
Category
News
Content rating
12+
Languages
SQ, HY, AZ, BN, BG, HR, CS, DA, NL, EN, ET, FI, FR, KA, DE, EL, HI, HU, ID, IT, JA, KO, LV, LT, MK, MS, NB, PL, PT, RO, RU, SR, ZH, SL, ES, SV, TH, ZH, TR, UK, VI

Company

Website
Not found
Tagline
Studying languages made simple!
Description
Not found
Founded
Not found
HQ / Address
Not found
Employees
Not found
Logo
Not found

Revenue

Verified revenue / mo
Not found
AI revenue estimate / mo
Not found
AI annual estimate
Not found
ML model estimate / mo
$86/mo
Top-grossing rank
Outside top 100 in US News
All-time revenue
Not found
Pricing
Not found

Founder

Name
Not found
X / Twitter
https://twitter.com/duoBooksApp
LinkedIn
https://www.linkedin.com/products/plainprog-duobooks/
GitHub
Not found
X followers
Not found
Public statements
Not found

Funding

Total raised
Not found
Last round
Not found
Investors
Not found
Crunchbase
Not found
AngelList
Not found

Press & Links

Articles found
Not found
Listed on
Not found
Blog
Not found
Press / News
Not found

Contacts & Socials

Socials
facebook · instagram · linkedin · twitter
Email
Not found
Phone
Not found
Contact page
Not found
About page
Not found
📈Ratings growth28 ratings+75% lifetimeShow 3-year history estimate ▾May 2023Nov 2024May 2026
Tracked (7 weeks) Pre-tracking estimate (36 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
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