# PDF Book Read vs oqou | Learn Languages

The clearest difference is iOS requirement: oqou | Learn Languages at 18.0 against PDF Book Read's 26.2. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. PDF Book Read sells 2 in-app purchases, starting at $1.99 per year and oqou | Learn Languages sells 6 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

PDF Book Read ships an update every 3 weeks, oqou | Learn Languages every 2 weeks. The most recent releases landed on October 28, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | PDF Book Read | oqou | Learn Languages |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (5 ratings)](https://appshunter.io/ios/app/oqou-learn-languages/id6777945652/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | — | Freemium |
| Size | 9 MB | 50 MB |
| Requires iOS | 26.2 | **18.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yuya Takamoto](https://appshunter.io/developer/1881459297) | [CUMA ALI KESICI](https://appshunter.io/developer/1717337126) |

## What reviewers say

### PDF Book Read

[App page](https://appshunter.io/ios/app/pdf-book-read/id6760929497)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Premium | $1.99 | per year |
| Lifetime Premium | $2.99 | one-time |


### oqou | Learn Languages

[App page](https://appshunter.io/ios/app/oqou-learn-languages/id6777945652)

Learn languages by reading content you enjoy. Import your own books, articles, or text, and tap any word for instant translation and context. A smart system helps you remember new vocabulary through spaced repetition.

**Highlights:** Import custom content (EPUB, PDF, web links), Instant word translation and article lookup, AI-powered context explanations, Spaced repetition vocabulary review, CEFR level assessment, Offline reading and audio

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Oqou Pro 1 Month | $8.99 | per month |
| Oqou Pro 1 Month | $8.99 | per month |
| Oqou Pro 3 Months | $22.99 | per 3 months |
| Oqou Pro 3 Months | $22.99 | per 3 months |
| Oqou Pro Annual | $69.99 | per year |
| Oqou Pro Annual | $69.99 | per year |


## Frequently asked questions

### Is PDF Book Read free?

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

### Is oqou | Learn Languages free?

oqou | Learn Languages is free to download, with in-app purchases available.

### Do PDF Book Read or oqou | Learn Languages have ads?

Neither PDF Book Read nor oqou | Learn Languages shows ads.

### Which is updated more often, PDF Book Read or oqou | Learn Languages?

PDF Book Read ships an update every 3 weeks, and oqou | Learn Languages every 2 weeks. Most recently, PDF Book Read was updated on October 28, 2026 and oqou | Learn Languages on November 5, 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.*