# duoBooks vs Book Summary

The clearest difference is iOS requirement: Book Summary at 12.0 against duoBooks's 15.0. On price, update cadence, 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 Book Summary sells 2 in-app purchases, starting at $9.00 per month. Whichever you choose, the download price is not the number that matters.

duoBooks ships an update every 2 weeks, Book Summary weekly. Both last shipped on October 27, 2026.

## The numbers

| Metric | duoBooks | Book Summary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (56 ratings)](https://appshunter.io/ios/app/duobooks-language-learning/id1538452253/reviews)** | — |
| Number of ratings | **56** | — |
| Positive reviews | 68.4% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 53 MB | 90 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [PlainProg LLC](https://appshunter.io/developer/1538452255) | [Phan Tai Phuong](https://appshunter.io/developer/952621043) |

## 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 |


### Book Summary

[App page](https://appshunter.io/ios/app/book-summary-nine-language/id6450974180)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $9.00 | per month |
| Yearly Premium | $59.00 | per year |


## Frequently asked questions

### Is duoBooks free?

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

### Is Book Summary free?

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

### Do duoBooks or Book Summary have ads?

Neither duoBooks nor Book Summary shows ads.

### Which is updated more often, duoBooks or Book Summary?

duoBooks ships an update every 2 weeks, and Book Summary weekly. Most recently, duoBooks was updated on October 27, 2026 and Book Summary 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.*