# Idiom vs duoBooks

Idiom and duoBooks both sit at 4.8 stars, but that hides the real split: 91% of Idiom's written reviews are positive against 68% of duoBooks's. Idiom also leads on ratings volume (176 vs 56). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Idiom sells 3 in-app purchases, starting at $2.99 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.

On the App Store both sit at effectively the same score — 4.8 for Idiom against 4.7 for duoBooks. Both are backed by a comparable volume of ratings — 176 and 56 respectively. Written reviews are what separate them: 91% of Idiom's written reviews are positive against 68% of duoBooks's.

Idiom ships an update every 9 days, duoBooks every 2 weeks. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Idiom | duoBooks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (176 ratings)](https://appshunter.io/ios/app/idiom-own-the-language/id1133735231/reviews)** | [4.7 (56 ratings)](https://appshunter.io/ios/app/duobooks-language-learning/id1538452253/reviews) |
| Number of ratings | **176** | 56 |
| Positive reviews | **91.4% of reviews** | 68.4% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Monetization | Freemium | Free with in-app purchases |
| Size | 7 MB | 53 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 12+ |
| Developer | [The Language Company](https://appshunter.io/developer/1653819176) | [PlainProg LLC](https://appshunter.io/developer/1538452255) |

## What reviewers say

### Idiom

[App page](https://appshunter.io/ios/app/idiom-own-the-language/id1133735231)

Master new languages with real-world content. Learn vocabulary from trending news, practice listening with popular shows, and improve reading comprehension with books. Supports over 100 languages.

**Highlights:** Learn from trending news, Practice with popular shows, Build reading comprehension with books, Import custom content (websites, videos, ebooks, PDFs), Camera mode for physical text, Supports over 100 languages

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Student | $2.99 | per month |
| Pro | $4.99 | per month |
| Patron | $6.99 | per month |


### 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 Idiom free?

Idiom 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, Idiom or duoBooks?

Idiom is rated higher. Idiom averages 4.8 out of 5 from 176 ratings, while duoBooks averages 4.7 from 56 ratings.

### Do Idiom or duoBooks have ads?

Neither Idiom nor duoBooks shows ads.

### Which is updated more often, Idiom or duoBooks?

Idiom ships an update every 9 days, and duoBooks every 2 weeks. Most recently, Idiom was updated on October 26, 2026 and duoBooks on October 27, 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.*