# duoBooks vs Readlang Language Readers

duoBooks and Readlang Language Readers both sit at 4.7 stars, but that hides the real split: 100% of Readlang Language Readers's written reviews are positive against 68% of duoBooks's. Readlang Language Readers also leads on update cadence (every 5 days vs every 2 weeks). duoBooks's advantage is ratings volume (56 vs 5) and iOS requirement (15.0 vs 18.0). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. duoBooks sells 11 in-app purchases, starting at $2.99 per month and Readlang Language Readers sells 3 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for duoBooks against 4.6 for Readlang Language Readers. That said, the two scores are not equally well evidenced: duoBooks has 56 ratings behind it against 5, 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 Readlang Language Readers's.

duoBooks ships an update every 2 weeks, Readlang Language Readers every 5 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | duoBooks | Readlang Language Readers |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (56 ratings)](https://appshunter.io/ios/app/duobooks-language-learning/id1538452253/reviews)** | [4.6 (5 ratings)](https://appshunter.io/ios/app/readlang-language-readers/id6755721145/reviews) |
| Number of ratings | **56** | 5 |
| Positive reviews | 68.4% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 53 MB | 64 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [PlainProg LLC](https://appshunter.io/developer/1538452255) | [Alisher Fayzullaev](https://appshunter.io/developer/1855851596) |

## What reviewers say

### duoBooks

[App page](https://appshunter.io/ios/app/duobooks-language-learning/id1538452253)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Plan | $2.99 | per month |
| Full Plan | $6.99 | per month |
| Full Plan | $17.99 | per year |
| 6 Month Full Plan | $19.99 | per 6 months |
| Full Yearly Plan | $29.99 | per year |
| War and Peace | $0.99 | one-time |
| Silver Blaze | $0.99 | one-time |
| On The River | $0.99 | one-time |
| Clochette | $0.99 | one-time |
| The Fishing Hole | $0.99 | one-time |
| Alice in Wonderland | $0.99 | one-time |


### Readlang Language Readers

[App page](https://appshunter.io/ios/app/readlang-language-readers/id6755721145)

Learn languages by reading content you enjoy. Tap any word for instant translation, save new vocabulary, and track your learning progress. Offers a free plan with daily limits and a premium subscription for unlimited access and advanced features.

**Highlights:** Instant word and phrase translation, Save and review translated words, Read websites and EPUB books, Vocabulary practice, Progress tracking, Distraction-free reading

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Readlang Premium Monthly | $8.99 | per month |
| Readlang Premium Yearly | $59.99 | per year |
| Lifetime access | $99.00 | one-time |


## Frequently asked questions

### Is duoBooks free?

duoBooks is free to download, with in-app purchases available.

### Is Readlang Language Readers free?

Readlang Language Readers is free to download, with in-app purchases available.

### Which has better reviews, duoBooks or Readlang Language Readers?

duoBooks is rated higher. duoBooks averages 4.7 out of 5 from 56 ratings, while Readlang Language Readers averages 4.6 from 5 ratings.

### Do duoBooks or Readlang Language Readers have ads?

Neither duoBooks nor Readlang Language Readers shows ads.

### Which is updated more often, duoBooks or Readlang Language Readers?

duoBooks ships an update every 2 weeks, and Readlang Language Readers every 5 days. Most recently, duoBooks was updated on October 24, 2026 and Readlang Language Readers on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*