# KyBook - EPub,FB2,PDF,DjVu Reader

> Versatile e-book reader with extensive format support and customization. (iPhone/iPad app by Konstantin Bukreev.)

- Source: https://appshunter.io/ios/app/kybook-epubfb2pdfdjvu-reader/id673027171 (this page in markdown: same URL + `.md`)
- Developer: [Konstantin Bukreev](https://appshunter.io/developer/547576207)
- Category: Books, Education
- Price: Free with in-app purchases
- Rating: 4.40/5 from 464 App Store ratings · 552 written reviews indexed
- Age rating: 17+
- Requires: iOS 8.0 · 50 MB
- Languages: Korean, Greek, Dutch, Danish, German (Germany), Russian, Romanian, Norwegian Bokmål, Swedish, European Spanish and 16 more
- Released: 2013-08-09
- Data updated: 2026-08-29
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/kybook-epubfb2pdfdjvu-reader/id673027171/reviews.md

## What is KyBook?

KyBook is a modern reader application for e-books.
It has highly customizable and friendly interface and also: 



Key features: 



- EPUB, FB2, RTF, PDF, DJVU, CHM, CBR, CBZ, MP3, M4A, M4B formats
- OPDS catalogs and network folders 

- Google Books, Google Drive, Dropbox, OneDrive, Yandex Disc
- Flexible reading mode settings

Complete feature list:

- Supports e-books in EPUB, FictionBook (fb2, fbz, fb2.zip), TXT, RTF, PDF, DJVU, CHM, Comic Book (cbr, cbz) and Audio Book (mp3, m4a, m4b) formats.
- Has wide opportunities in searching and downloading e-books from different sources.
- Provides access to enormous collection of free electronic books through OPDS-catalogs support.
- Downloads e-books with the help of Web Browser (Mobile Safari), e-mail or iTunes.     
- Saves your books into cloud storages and network folders.
- Integrated with Google Books, Google Drive, Dropbox, OneDrive and Yandex Disc.
- Allows flexible setting of text displaying: font selection, colour theme, text size, text alignment mode, line height, margins, paragraph indention and hyphenations.    
- Allows choosing book covers from different sources, changing titles and subjects.
- Provides easy navigation inside the book using table of content, bookmarks or notes. 
- Helps organizing your books on shelves, cataloging them under subjects and sorting in different modes.  
- Has full-screen reading mode in landscape and portrait orientation.
- Allows turning and scrolling pages in vertical or horizontal mode.  
- Allows locking orientation and changing screen brightness.  
- Supports dictionaries, translation of selected text and text-to-speech.
- Integrated with social networking services (Facebook, Twitter, Vkontakte)
- Supports of VK Docs as Cloud Storage
- Built-in Web Browser
- Supports Tor Network
- DJVU and PDF filters
- Support of archives in ZIP and RAR format
- Password-protected Bookshelves
- Speed Reading (RSVP)
- Automatic text summarization
- Integrated with LitRes.ru
- Integrated with Samizdat (samlib.ru)
- Supports WebDAV protocol


Dear users, DJVU, CHM, Tor Network and 'Speed Reading' requires in-app purchase "Upgrade to Pro Version". 
You are free to use these features during the trial period. After the trial period You can unlock them via upgrading KyBook to Pro Version.

## Key features

- Supports EPUB, FB2, PDF, DJVU, CBR, CBZ, MP3, M4A, M4B formats
- OPDS catalogs and cloud storage integration
- Customizable reading mode settings
- Book organization and cataloging
- Text-to-speech and dictionary support
- Speed Reading (RSVP)

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Upgrade to Pro Version | $1.99 | one-time |
| Upgrade to Pro Version | $0.99 | one-time |


## What do users think of KyBook?

Overall sentiment: positive

**Pros**

- 👍 Easy to use
- 🚀 Fast and smooth performance
- 📚 Supports wide range of file formats
- 🔖 Good organization and categorization features
- 🔊 Excellent text-to-speech functionality
- 💻 Works well on iPad

**Cons**

- 🐛 Syncing issues, especially with Dropbox and Google Drive
- 🔍 Navigation and file management could be improved
- 💰 Paid version required for some key features
- 📢 Intrusive ads in free version
- 🔧 Lack of updates and support from developers

**Commonly reported bugs**

- Crashes after recent iOS updates
- Text-to-speech function not working properly on newer devices
- Inability to delete books from the app
- Inconsistent theme and color customization behavior

**Most requested features**

- Add support for more languages
- Improve image handling and layout
- Implement better annotation and highlighting tools
- Provide easier access to main library from subfolders
- Add ability to password protect individual books or folders

## Recent user reviews (10 of 552)

All indexed reviews: https://appshunter.io/ios/app/kybook-epubfb2pdfdjvu-reader/id673027171/reviews.md

### 1/5 — Errors

*2026-07-31, version 2.1.6*

The KyBook e-reader error is caused by a critical issue: the developer has abandoned the app, and the SSL certificates for its sync servers have long since expired.
Since Apple's built-in mechanisms (iOS/iPadOS) strictly require a secure TLS connection, an outdated or missing certificate on the KyBook server reliably blocks authorization and syncing with error code -1200.

### 5/5 — Долгие годы использования

*2026-07-29, version 2.1.6*

KyBook — отличное приложение для чтения! Мне нравится его удобный интерфейс и возможность настраивать форматирование текста по своему вкусу. Библиотека поддерживает множество форматов, что очень удобно. Также радует возможность синхронизации с облаком. В общем, отличное решение для любителей книг! Рекомендую!

### 2/5 — 问

*2026-06-05*

怎么改中文呢？

### 1/5 — Wasted money sorry

*2026-04-30, version 2.1.6*

I wanted this to load from my device files like most do I even tried Gutenbergs books zero chance .got message as per below
Oh well wasted my money as nothing works ,only reason I paid was because good reviews ….dont know how they got good reviews. 

Access blocked: Project
Gutenberg's request does not comply with Google's policies
Project Gutenberg's request does not comply with Google's "Use secure browsers" policy. If this app has a website, you can open a web browser and try signing in from there. If you are attempting to access a wireless network, please follow these instructions.
You can also contact the developer to let them know their app must comply with Google's "Use secure browsers" policy.
Learn more about this error
If you are a developer of Project Gutenberg, see error details.
Error 403: disallowed
_useragent
English (United States) -
Help
Privacy
Terms

### 5/5 — Ótimo e simples

*2026-02-06*

Melhor leitor e gerenciador de djvu disponível. Fácil e intuitivo.

### 5/5 — Лучшая читалка

*2026-01-29, version 2.1.6*

Отличная программа для чтения книг, позволяет выделять текст, что особенно полезно, если вы перечитываете какую-то научную или техническую литературу. Очень нравится возможность сохранять и синхронизировать библиотеку в облачное хранилище. Я пробовал не более позднюю программу, вторую версию, но это мне нравится гораздо больше, так как мне легче настроить текст, его разбивку, шрифт и цветовую схему в точности так, как мне наиболее удобно. Поэтому я буду продолжать использовать именно эту, первую версию программы.
Огромное спасибо разработчикам за создание этого приложения!

### 3/5 — Проблемы

*2026-01-05*

Приобрела новый телефон, и голосовое воспроизведение стало читать с ошибками. «» читает как бэкслэш. Еле привыкла. Снова обновила телефон и снова проблемы. Все диалоги - произносит «запятая». То есть везде где есть дефис, произносится «запятая»

### 1/5 — Lots of options by don’t need but one

*2025-11-05, version 2.1.6*

Got a lot of epub files in a couple of directories on my iPad. Cannot find a way to navigate to these folders to open them. Tried the file ‘open with’ option by KY Book isn’t a choice. GuessI will find another app

### 1/5 — Blocks IOS26

*2025-09-26*

This app blocks IOS26. You have to reboot the iPhone to exit it.

### 5/5 — Works on my IPad

*2025-07-26, version 2.1.6*

It's almost impossible to find an app that works on my IPad, but this app works just fine. Thanks to the developers!

## Frequently asked questions about KyBook

### What file formats does KyBook support?

KyBook supports a wide array of e-book and audiobook formats, including EPUB, FictionBook (fb2, fbz, fb2.zip), TXT, RTF, PDF, DJVU, CHM, Comic Book (cbr, cbz), and Audio Book (mp3, m4a, m4b). It also supports archives in ZIP and RAR formats.

### How can I get books into KyBook?

You can download e-books using the built-in Web Browser, via email, or through iTunes. The app also integrates with cloud storage services like Google Books, Google Drive, Dropbox, OneDrive, and Yandex Disc, and supports OPDS catalogs for direct downloading.

### Are there any costs associated with using KyBook?

The core functionality of KyBook is free. However, certain advanced features such as DJVU and CHM support, Tor Network access, and 'Speed Reading' require an in-app purchase to unlock permanently after a trial period.

### What customization options are available for reading?

KyBook offers extensive customization for the reading experience. You can adjust font selection, color themes, text size, alignment, line height, margins, paragraph indention, and hyphenations. It also allows for full-screen reading in both landscape and portrait modes, with options to lock orientation and adjust screen brightness.

### Can KyBook help me find new books?

Yes, KyBook provides access to a vast collection of free electronic books through its support for OPDS catalogs. This allows you to browse and download titles directly from various online sources within the app.

## Version history (last 5 releases)

### 2.1.6 — 2016-06-03

This update from Apple will improve the functionality of this app. No new features are included.

Fixed minor bugs.

Thank you for using KyBook!
Please remember to update your reviews.

### 2.1.5 — 2016-04-27

Fixed an issue with restoring of the in-app purchases.

Thank you for using KyBook!
Please remember to update your reviews.

### 2.1.4 — 2016-04-18

Fixed an issue with broken screen rotation lock when reading.
Fixed an issue with zooming PDF,DJVU.

Thank you for using KyBook!
Please remember to update your reviews.

### 2.1.2 — 2016-04-13

Added an ability to export the Samizdat authors.
Fixed an issue with charset encoding in certain books in Chinese.

### 2.1.1 — 2016-03-26

Fixed crash when opening a file in CHM format.

Thank you for using KyBook!
Please remember to update your reviews.

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| --- | --- | --- | --- |
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## More apps by Konstantin Bukreev

- [KyBook 2 Ebook Reader](https://appshunter.io/ios/app/kybook-2-ebook-reader/id1018584176)
- [BiLibre DjVu and PDF Reader](https://appshunter.io/ios/app/bilibre-djvu-and-pdf-reader/id1230039040)
- [KyBook 3 Ebook Reader](https://appshunter.io/ios/app/kybook-3-ebook-reader/id1348198785)

All apps by Konstantin Bukreev: https://appshunter.io/developer/547576207

## Related topics

[kybook](https://appshunter.io/ios/topics/kybook) · [kybook 2 ebook reader](https://appshunter.io/ios/topics/kybook-2-ebook-reader) · [djvu pdf](https://appshunter.io/ios/topics/djvu-pdf) · [kybook3](https://appshunter.io/ios/topics/kybook3) · [kybook 3 ebook reader](https://appshunter.io/ios/topics/kybook-3-ebook-reader) · [ebook pdf](https://appshunter.io/ios/topics/ebook-pdf) · [serial reader](https://appshunter.io/ios/topics/serial-reader)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*