# Polyglot Reader vs duoBooks

The clearest difference is ads: duoBooks at none against Polyglot Reader's shown. duoBooks also leads on update cadence (every 2 weeks vs every 2 months) and rating (4.7 vs 4.4). On price, review sentiment, ratings volume and in-app purchases there is nothing between them.

Both are free to download. Polyglot Reader sells 11 in-app purchases, starting at $3.99 per month and duoBooks sells 11 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

duoBooks holds the better App Store score, 4.7 against 4.4. Both are backed by a comparable volume of ratings — 74 and 48 respectively. Written reviews point the same way: 66% of Polyglot Reader's written reviews are positive against 69% of duoBooks's.

Polyglot Reader ships an update every 2 months, duoBooks every 2 weeks. The most recent releases landed on September 28, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Polyglot Reader | duoBooks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (74 ratings)](https://appshunter.io/ios/app/polyglot-reader/id1015619263/reviews) | **[4.7 (48 ratings)](https://appshunter.io/ios/app/duobooks-language-learning/id1538452253/reviews)** |
| Number of ratings | **74** | 48 |
| Positive reviews | 65.7% of reviews | **68.6% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 120 MB | 54 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Anton Ivanov](https://appshunter.io/developer/594091388) | [PlainProg LLC](https://appshunter.io/developer/1538452255) |

## What reviewers say

### Polyglot Reader

[App page](https://appshunter.io/ios/app/polyglot-reader/id1015619263)

Read books in foreign languages and learn new vocabulary. Tap on unknown words for instant translations and save them to flashcards for later study. Supports various document formats and offers pronunciation practice and knowledge tests.

**Highlights:** Read books in multiple formats (PDF, EPUB, TXT), Translate unknown words and phrases instantly, Create flashcards for vocabulary learning, Pronunciation support for words and phrases, Knowledge tests for vocabulary sets, Scan and recognize text from documents

**Features:** macOS Compatibility

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $3.99 | per month |
| Monthly subscription | $7.99 | per month |
| Monthly subscription | $7.99 | per month |
| Monthly subscription | $9.99 | per month |
| Annual subscription | $22.99 | per year |
| Annual subscription | $34.99 | per year |
| Annual subscription | $39.99 | per year |
| Annual subscription | $59.99 | per year |
| Upgrade from advanced to professional version | $3.99 | one-time |
| Upgrade from Starter to Advanced version | $15.99 | one-time |
| Full version | $99.99 | one-time |


### 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 |


## Frequently asked questions

### Is Polyglot Reader free?

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

### Is duoBooks free?

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

### Which has better reviews, Polyglot Reader or duoBooks?

duoBooks is rated higher. Polyglot Reader averages 4.4 out of 5 from 74 ratings, while duoBooks averages 4.7 from 48 ratings.

### Do Polyglot Reader or duoBooks have ads?

Polyglot Reader shows ads; duoBooks does not.

### Which is updated more often, Polyglot Reader or duoBooks?

Polyglot Reader ships an update every 2 months, and duoBooks every 2 weeks. Most recently, Polyglot Reader was updated on September 28, 2026 and duoBooks on October 1, 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.*