Comparison

KyBook vs A FB2 Reader

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

KyBook

This app is a versatile e-book reader supporting a wide range of formats including EPUB, PDF, and audiobooks. It offers extensive customization for reading modes, cloud storage integration, and easy book organization. Advanced features like DJVU support and speed reading are available via in-app purchase.

Highlights
  • 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)
Features
Read full description

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.

About

A FB2 Reader

This free application allows you to read your favorite FB2 format ebooks on your iPad and iPhone. Easily import books from various sources, customize your reading experience with adjustable fonts and color schemes, and navigate your library with ease.

Highlights
  • Read FB2 ebooks
  • Import from web, iTunes, and cloud drives
  • Adjustable fonts, spacing, and width
  • Three color schemes
  • Easy navigation and page turning
  • Sort books by various criteria
  • Book image gallery
Features
Read full description

A FB2 Reader lets you read your favorite books on iPad without any restrictions and hidden fees. A FB2 Reader completely free ebook reading application, you can collect unlimited number of titles in your Library and read them for you own pleasure. Application optimized for all iPad and iPhone models and high resolution Retina Display graphics. It is possible to load ebooks in fb2 format into application by a number of way, like: - download fb2 books using your favorite web browser application and open it with A FB2 Reader using "Open In..." iSO feature - use iTunes file sharing to copy files from you computer - import books from you preferred cloud drive - Dropbox, OneDrive and Google Drive currently supported, more options coming in next versions A FB2 Reader features: - Turn pages with a tap or swipe - Easy navigation inside the book - Open electronic books from any source - Automatically expands fb2 files from zip archive - Adjustable fonts and font sizes - Adjustable line spacing - Adjustable page width - Three color schemes - Sort books by File name, Book Title, Author or Recently opened - Book Information Page - Book Images Gallery View - all embedded images on one page - Book sharing - possible to transfer book to any destination supported by iOS or any application which can handle this file type

Screenshots

KyBook4 screens
A FB2 Reader3 screens

Verdict

The call

The clearest difference is rating: KyBook at 4.4 against A FB2 Reader's 3.4. KyBook also leads on ratings volume (464 vs 5). A FB2 Reader's advantage is in-app purchases (none vs 2). On price, review sentiment, update cadence and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. KyBook sells 2 one-off in-app purchases. A FB2 Reader asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

KyBook holds the better App Store score, 4.4 against 3.4. That said, the two scores are not equally well evidenced: KyBook has 464 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 71% of KyBook's written reviews are positive against 67% of A FB2 Reader's.

UpkeepUpdate frequency

KyBook ships an update every 3 weeks, A FB2 Reader every 2 weeks. The most recent releases landed on September 25, 2026 and September 24, 2026 respectively.

Scorecard4 real differences · 6 level
KyBook versus A FB2 Reader: the parameters behind the verdict, then further details
ParameterKyBookA FB2 Reader
PriceFreeFree
Rating4.4 (464 ratings) — better3.4 (5 ratings)
Positive reviews71.2% of reviews — better67.1% of reviews
Number of ratings464 — better5
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better9.0
Further details — not scored
Size50 MB18 MB
Age rating17+4+
DeveloperKonstantin BukreevYuri Staloverov

Customer experience

KyBook

All ratings464 ratings
Positive85.3%
Neutral3.2%
Negative11.4%
Written reviews552 reviews
Positive71.2%
Neutral8.2%
Negative20.7%

A FB2 Reader

All ratings5 ratings
Positive60.0%
Neutral0.0%
Negative40.0%
Written reviews70 reviews
Positive67.1%
Neutral5.7%
Negative27.1%

Bugs and requests

KyBook

Reported bugs

4 issues
  • 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

Requested features

5 requests
  • 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

A FB2 Reader

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

KyBook

One-time2
  • Upgrade to Pro Version$0.99
  • Upgrade to Pro Version$1.99
None

A FB2 Reader

No in-app purchases

Questions

Is KyBook free?
KyBook is free to download, with in-app purchases available.
Is A FB2 Reader free?
A FB2 Reader is free to download, with no in-app purchases.
Which has better reviews, KyBook or A FB2 Reader?
KyBook is rated higher. KyBook averages 4.4 out of 5 from 464 ratings, while A FB2 Reader averages 3.4 from 5 ratings.
Do KyBook or A FB2 Reader have ads?
Neither KyBook nor A FB2 Reader shows ads.
Which is updated more often, KyBook or A FB2 Reader?
KyBook ships an update every 3 weeks, and A FB2 Reader every 2 weeks. Most recently, KyBook was updated on September 25, 2026 and A FB2 Reader on September 24, 2026.

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