# duoBooks vs Bubble Translator

The clearest difference is rating: duoBooks at 4.7 against Bubble Translator's 1.0. duoBooks also leads on update cadence (every 2 weeks vs every 2 months) and ratings volume (48 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. duoBooks sells 11 in-app purchases, starting at $2.99 per month and Bubble Translator sells 3 in-app purchases, starting at $8.99 per 7 days. Whichever you choose, the download price is not the number that matters.

duoBooks holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: duoBooks has 48 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 69% of duoBooks's written reviews are positive against 50% of Bubble Translator's.

duoBooks ships an update every 2 weeks, Bubble Translator every 2 months. The most recent releases landed on September 21, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | duoBooks | Bubble Translator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (48 ratings)](https://appshunter.io/ios/app/duobooks-language-learning/id1538452253/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/bubble-translator/id6746490054/reviews) |
| Number of ratings | **48** | 1 |
| Positive reviews | **68.6% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | Freemium |
| Size | 54 MB | 70 MB |
| Requires iOS | 15.0 | 15 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [PlainProg LLC](https://appshunter.io/developer/1538452255) | [Numan Durrani](https://appshunter.io/developer/1812422678) |

## 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 |


### Bubble Translator

[App page](https://appshunter.io/ios/app/bubble-translator/id6746490054)

Translate text, spoken words, photos, and documents instantly across multiple languages. Features include real-time voice translation, image-to-text conversion, and a history of all your translations for seamless communication.

**Highlights:** Real-time voice translation, Text translation, Photo translation, Camera translation, Translation history, Text-to-speech, Image to text conversion

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly PREMIUM Plan | $8.99 | per 7 days |
| Monthly PREMIUM Plan | $23.99 | per month |
| Annual PREMIUM Subscription | $39.99 | per year |


## Frequently asked questions

### Is duoBooks free?

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

### Is Bubble Translator free?

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

### Which has better reviews, duoBooks or Bubble Translator?

duoBooks is rated higher. duoBooks averages 4.7 out of 5 from 48 ratings, while Bubble Translator averages 1.0 from 1 ratings.

### Do duoBooks or Bubble Translator have ads?

Neither duoBooks nor Bubble Translator shows ads.

### Which is updated more often, duoBooks or Bubble Translator?

duoBooks ships an update every 2 weeks, and Bubble Translator every 2 months. Most recently, duoBooks was updated on September 21, 2026 and Bubble Translator on September 11, 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.*