# KyBook 3 Ebook Reader vs eBoox

The clearest difference is in-app purchases: eBoox at none against KyBook 3 Ebook Reader's 4. eBoox also leads on review sentiment (88% vs 61%) and chart position (#209 vs unranked). KyBook 3 Ebook Reader's advantage is update cadence (every 5 days vs monthly). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. KyBook 3 Ebook Reader sells 4 in-app purchases, starting at $4.49 per 3 months. eBoox asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for KyBook 3 Ebook Reader against 4.8 for eBoox. Both are backed by a comparable volume of ratings — 4.7K and 3.8K respectively. Written reviews are what separate them: 61% of KyBook 3 Ebook Reader's written reviews are positive against 88% of eBoox's.

KyBook 3 Ebook Reader ships an update every 5 days, eBoox monthly. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | KyBook 3 Ebook Reader | eBoox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (4.7K ratings)](https://appshunter.io/ios/app/kybook-3-ebook-reader/id1348198785/reviews) | **[4.8 (3.8K ratings)](https://appshunter.io/ios/app/eboox-fb2-epub-book-reader/id1489172068/reviews)** |
| Number of ratings | **4.7K** | 3.8K |
| Positive reviews | 60.9% of reviews | **88.4% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Monthly |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | — | **#209** |
| Size | 53 MB | 177 MB |
| Requires iOS | 11.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Konstantin Bukreev](https://appshunter.io/developer/547576207) | [REDIT, OOO](https://appshunter.io/developer/1527115266) |

## What reviewers say

### KyBook 3 Ebook Reader

[App page](https://appshunter.io/ios/app/kybook-3-ebook-reader/id1348198785)

This app is a versatile e-book reader and cataloger supporting numerous formats like EPUB, MOBI, and PDF. It offers a comfortable reading experience with customizable options, powerful annotation tools, and seamless cloud storage integration. Organize your library with tags, collections, and a handy cataloguer.

**Highlights:** Supports all major e-book formats, OPDS catalog access, Comfortable reading mode with themes, Powerful annotations and summary editor, Handy cataloguer with tagging, Cloud storage integration

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 months subscription | $4.49 | per 3 months |
| Yearly subscription | $14.99 | per year |
| Upgrade to Pro (Discount) | $2.99 | one-time |
| Upgrade to Pro | $4.99 | one-time |

**What reviewers like**

- 🚀 Excellent design, close to no ads
- 🚀 Handles various file formats well
- 👍 Customizable, lots of features
- 👍 Stable and fast
- 👍 Good for reading comics/manga

**What reviewers complain about**

- 🐛 Sync and account issues
- 🐛 Crashes, bugs, and compatibility problems
- 🔍 Confusing interface, hard to use
- 💰 Paid features and subscription model
- 🔍 Missing key features like page turn animation

**Reported bugs**

- Inability to open/read certain file formats
- Sync and account creation issues
- Problems with PDF and image display
- Crashes and compatibility problems
- Duplication of books in library

**Requested features**

- Left alignment option
- Dark mode/OLED black theme
- Improved image handling
- Better support for Chinese language
- Vertical page flip


### eBoox

[App page](https://appshunter.io/ios/app/eboox-fb2-epub-book-reader/id1489172068)

**Currently charting:** #209 Top Free · Book (US App Store)

This application provides a comfortable and customizable reading experience for a wide variety of e-book formats. It offers features like bookmarks, highlights, dark mode, and offline reading, with seamless online synchronization. Books can be easily uploaded from various sources, including cloud storage and email.

**Highlights:** Supports EPUB, MOBI, FB2, DOC, TXT, and more, Customizable fonts, text size, and brightness, Dark mode and offline reading, Bookmarks, highlights, and notes, Online auto-sync of books and progress, AD-FREE reading experience

**In-app purchases:** none

**What reviewers like**

- 🚀 Smooth and fast reading experience
- 👍 Clean and intuitive interface
- 🔒 No ads or in-app purchases
- 💡 Ability to customize fonts and themes
- 🚀 Seamless syncing across devices

**What reviewers complain about**

- 🐛 Occasional issues with highlighting and annotations
- 🔧 Limited font and customization options
- 🔧 Lack of built-in dictionary or translation features
- 🔧 Difficulty importing books from local storage
- 🔧 Inconsistent page numbering and progress display

**Reported bugs**

- Highlighting and annotations sometimes behave unexpectedly
- Syncing between devices can be unreliable at times
- Occasional crashes or freezes when navigating the app

**Requested features**

- Add more font options, including bold and italic
- Implement a built-in dictionary or translation tool
- Allow direct import of books from local device storage
- Improve page numbering and reading progress display
- Add support for PDF files and annotations


## Frequently asked questions

### Is KyBook 3 Ebook Reader free?

KyBook 3 Ebook Reader is free to download, with in-app purchases available.

### Is eBoox free?

eBoox is free to download, with no in-app purchases.

### Which has better reviews, KyBook 3 Ebook Reader or eBoox?

eBoox is rated higher. KyBook 3 Ebook Reader averages 4.7 out of 5 from 4.7K ratings, while eBoox averages 4.8 from 3.8K ratings.

### Do KyBook 3 Ebook Reader or eBoox have ads?

Neither KyBook 3 Ebook Reader nor eBoox shows ads.

### Which is updated more often, KyBook 3 Ebook Reader or eBoox?

KyBook 3 Ebook Reader ships an update every 5 days, and eBoox monthly. Most recently, KyBook 3 Ebook Reader was updated on October 26, 2026 and eBoox 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.*