KyBook is the application for reading and cataloging e-books in a modern, user-friendly style.

KyBook supports all the major e-book formats, OPDS catalogs and Cloud Storage.

Key features
• All the major e-book formats
• OPDS catalogs
• Comfortable reading mode
• Powerful annotations
• Handy cataloguer
• Cloud Storage

Ebook Formats
• EPub (DRM-free)
• PDF (DRM-free)
• MobiPocket and Kindle (mobi, azw3)
• DjVu
• FictionBook (fb2,
• Comic Book (cbr, cbz, cbt)
• Audio Book (mp3, m4a, m4b)
• Plain and rich text (txt, rtf)

OPDS Catalogs
• Provides access to enormous collection of free electronic books through OPDS-catalogs support.
• Built-in list of well-known OPDS Catalogs
• Allows add own catalog (e.g. Calibre content server)
• Supports for .onion OPDS Catalogs reachable via Tor Network

Comfortable reading mode
• Themes, color schemes for reading (day, night, sepia and more).
• Page turn with scroll, curl and slide.
• Designed to be fast, energy efficient, optimized for very large books (books in millions of words)
• Auto scrolling mode
• Text-to-speech technology to voice any e-book

EPUB/FB2/MOBI specific features
• Customizable font, text size, page margins, paragraph indentation, background and more
• Typography aware (hanging punctuation, hyphenations and more)

PDF/DJVU specific features
• Crops a page margins in manual and automatic mode
• Smart zooming by double-tap
• PDF Reflow on iPhone

Powerful annotations
• Marked text and bookmarks
• Drawn annotations in any ebook (Apple Pencil support and just by touching).
• Annotations exports in Markdown, HTML, PDF, RTF formats.

Built-in the summary editor
• Markdown formatting.
• Exports summaries in Markdown, HTML, PDF, RTF formats.

Working with fragments of text
• Translation of separate words or complete sentences in different languages.
• Search for a word definition in dictionaries.
• Custom dictionaries in Dictd, StarDict and Lingvo DSL format
• Full text searching in a book (textual, fuzzy and search using regular expressions).
• Built-in search for a selected text on the Internet or Wikipedia.

Handy cataloguer
• Grouping by categories: by authors, subjects, sequences, publishers, tags, popular, recent, new, unread, reading and finished.
• Tags and collections to categorize ebooks.
• Search for books in the library and anywhere in the Internet.
• Own folders tree and flexible bookshelf settings for layout and sorting.
• Arranging books on a bookshelf by dragging.

Working with a metadata and a table of contents
• Automated extraction of a metadata from ebooks.
• Convenient editing of a metadata.
• Editing and creation (automatic or manual) of a table of contents.

File Storage
• Locally on the device.
• In the Cloud Storage (iCloud Drive, Google Drive, OneDrive, Dropbox, Yandex Disk).
• In the Local network on Shared Folders (SMB/CIFS) or on WebDAV server
• Transparent caching of books in the Internet or Local network.
• Supports of streaming audio books in Cloud Storage.
• Content Server for accessing files on the device via a WiFi.

Synchronization (requires subscription)
• Syncs all ebooks metadata and files.

KyBook offers the following subscriptions options:
• 3 months: 4.49 USD
• 1 year: 14.99 USD

Prices may vary in other countries respecting your local currency exchange rate. Your subscription will be charged to your iTunes account. At the end of the term, unless auto-renewables subscriptions are disabled, your subscription will automatically renew in your iTunes account. You will be charged for the regular price of your subscription within 24 hours prior to the end of the current term. You can turn off automatic renewal in your iTunes account settings at any time, but you must do so at least 24 hours before the end of the current term. Refunds will not be provided for the unused portion of any term.

Terms & Privacy policy

What's New

Version 0.5.6

- Trash Bin for deleted books.
- Feature to manually to add a download link.
- Fixed crashes when opening some EPubs.
- Various bug fixes and stability improvements.

- Reader rotation lock (available on iPhone only).
- Reader draws a full-sized hyphen in EPUB,MOBI books when the readability setting `Hanging punctuation` is disabled.
- Added an ability to batch download from OPDS Catalog (requires Pro).
- Added an ability to select multiple books in the Catalogue categories "New", "Read", "Unread", etc.
- Fixed the crash during selection a sentence spread on multiple pages in PDF/DJVU books.
- Fixed an issue with the reader header/footer in an advanced interface and a fullscreen mode.
- Various minor improvements and bug fixes.

Ratings and Reviews

4.3 out of 5
41 Ratings
41 Ratings

Was a great app


Version 2 was great, awesome, unique and a must install. Now version 3 and not much has changed but a new pricing model. Why??!??? I paid lads than three months ago and would not mind to upgrade to version 3. Show me the benefits and what is better about. Why not have a discount for version 2 holders? Then on top of that you have a subscription mode? Why do you give me a pro “upgrade” model and then ask for subscription? Ugh. Did Adobe or Microsoft buy you or something. Another day another app that wants to jump on the SAAS model. Very unhappy. I guess I will convert all mobi and epub to pdf or just import into iBooks. Another app down the tube. What is the point of a “subscription” model for this? I understand making some money and keeping it updated so charge me a flat fee. I use it once a month or so, so I am not doing the rolling subscription. Uninstalling and keeping version 2 until a response is heard or you roll back on the decision. I have a cloud subscription for iCloud so why can’t I download and sync with that? I have all my ebooks there already and would love it to see your team utilize iCloud fully. Why get in the business of making a book storage server? Apple and Google can do it way better and cheaper. Please rethink this and stick to what you are good at. Creating a book reader. If this continues I hope Apple buys this app and rolls it into iBooks. Win-win for me. Thanks anyway.

It’s okay...


It’s basically just like KyBook 2 (which I used before) except you have to click on different stuff in different places. I guess there’s also more voices but I have always used Nicky so they don’t really matter that much to me. This app has a bad habit of skipping to random parts in the book and one time actually caused me to hear a spoiler. But I’ll finish on a good note, I LOVE how you can do text to speech and exit out of the app and it still keeps playing! I love it because I like to draw what I see in my head so I draw on an app (I’m not plugging in a review for a different app) and I listen to my book on here!

Fantastic eBook Reader App

Coffee Ant

This app has been the best one I’ve ever used among other eBook reader apps out there. It allows me to view various eBook formats directly from my Google Drive!


Konstantin Bukreev
51.7 MB
Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Russian
Age Rating
You must be at least 17 years old to download this app.
Infrequent/Mild Horror/Fear Themes
Unrestricted Web Access
© Konstantin Bukreev
In-App Purchases
  1. Upgrade to Pro (Discount) $1.99
  2. Upgrade to Pro $3.99
  3. 3 months subscription $4.49


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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