Comparison

KyBook vs i2Reader Cloud

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

i2Reader Cloud

This app offers a comfortable reading experience with cloud synchronization across devices. Enjoy customizable layouts, interactive features like footnotes and dictionaries, and the ability to download books from various cloud services. It supports multiple formats and allows family sharing of libraries.

Highlights
  • iCloud synchronization for library and reading progress
  • Customizable book layout (fonts, colors, spacing)
  • Download books from Dropbox, Google Drive, Yandex Disk
  • Interactive footnotes and dictionary support
  • Family sharing and user reading statistics
  • Supports FB2, EPUB, MOBI, DOC, PDF formats
  • Auto-scrolling and auto-page turning
Features
Read full description

Reading with comfort is a dream of any book lover! It’s more than 10 years already that my i2Reader has been making this dream come true. With each version of the app I add a bunch of new options and always try to keep the pleasure of reading a top priority. When putting books on digital shelves or turning over their 3D pages on any device (Mac, iPhone or iPad), you will always feel “I too Reader”* * - this is not a mistake :) Main features: • iCloud support: your library is synchronized in all your devices. You can start reading a book on iPhone and continue doing it on iPad or Mac! Everything from last the opened page, bookmarksо, highlighters to book metadata, including user's choice of a book cover, titles, genres, keywords, series etc. - is synchronized in each book; • Footnotes are displayed on the bottom of the page – like in real paper books! • Full support of 3D Touch: - in a library: to peek at a book info, press slightly on it; swipe up to bring up a context menu for this book; - when reading, you can assign 3D Touch to one of these options: Wikipedia or dictionaries. Press on a word and the assigned option will run right away, bypassing context menu. • Interactive guide to introduce features of the app; • Support of multitasking Side Over and Split View for iPad Pro, iPad Air or iPad mini; • Support Drag and Drop for iPad under iOS 11; • AutoScrolling – vertical text scrolling with adjustable by horizontal swipe speed; • Auto Turning – automatic page turning according to timer; • download books from Dropbox, Google Drive and Yandex disk as well. Google Drive now supports download of GDOC (Google Docs) files; • User's access: now all members of your family can read the same books not interfering with each other. Besides, the new feature enables you to highlight text fragments and comment on it, thus making up mini-chats in your own mini social/family networks :) • Review of reading statistics for both particular books and individual library users; • adjust brightness of the screen with a two-fingers vertical swipe; • finest configuration of a book layout for the most comfortable reading: everything like fonts, font size, colors, background is adjustable, including paragraph and line spacing; • i2Reader works with FB2 (also fb2.zip or fbz), EPUB (no DRM protection), MOBI, RTF, MS Word DOC/DOCX and PDF book formats; • different ways of page turning (including 3d page turning and vertical scroll); • voice/audio reading with the use of voice synthesizer; • easy selection and sorting of books based on various criteria - you won't get lost in your library and find your book in no time; • you can also create digital shelves which are also synchronized via iCloud; • support of starDict and XDXF dictionaries when reading; • Support of in-built iOS dictionaries; • support of Lingvo dictionaries when reading (if you have installed Lingvo app); • widget for notification center; • you can now share quotes to Facebook, twitter, Evernote or send then via email; • you can also download books from public OPDS libraries. All features in one simple and handy interface - now everything is at your fingertips! You are always welcome to share your opinion and suggestions to support@i2reader.net

Screenshots

KyBook4 screens
i2Reader Cloud4 screens

Verdict

The call

The clearest difference is review sentiment: KyBook at 71% against i2Reader Cloud's 48%. KyBook also leads on rating (4.4 vs 4.1) and update cadence (every 3 weeks vs every 3 months). On price, ads, in-app purchases and monetization model 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 and i2Reader Cloud sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

KyBook holds the better App Store score, 4.4 against 4.1. That said, the two scores are not equally well evidenced: KyBook has 464 ratings behind it against 74, 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 48% of i2Reader Cloud's.

UpkeepUpdate frequency

KyBook ships an update every 3 weeks, i2Reader Cloud every 3 months. The most recent releases landed on September 25, 2026 and September 24, 2026 respectively.

Scorecard5 real differences · 5 level
KyBook versus i2Reader Cloud: the parameters behind the verdict, then further details
ParameterKyBooki2Reader Cloud
PriceFreeFree
Rating4.4 (464 ratings) — better4.1 (74 ratings)
Positive reviews71.2% of reviews — better48.4% of reviews
Number of ratings464 — better74
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better15.6
Further details — not scored
Size50 MB37 MB
Age rating17+17+
DeveloperKonstantin BukreevYuriy Melyushin

Customer experience

KyBook

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

i2Reader Cloud

All ratings74 ratings
Positive78.4%
Neutral4.1%
Negative17.6%
Written reviews64 reviews
Positive48.4%
Neutral7.8%
Negative43.8%

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

i2Reader Cloud

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
5 purchases

i2Reader Cloud

One-time5
  • Auto-scroll$0.99
  • Seamless textures$0.99
  • Auto turning$0.99
Show 2 more
  • Online translator$1.99
  • Removal of limitations$3.99

Questions

Is KyBook free?
KyBook is free to download, with in-app purchases available.
Is i2Reader Cloud free?
i2Reader Cloud is free to download, with in-app purchases available.
Which has better reviews, KyBook or i2Reader Cloud?
KyBook is rated higher. KyBook averages 4.4 out of 5 from 464 ratings, while i2Reader Cloud averages 4.1 from 74 ratings.
Do KyBook or i2Reader Cloud have ads?
Neither KyBook nor i2Reader Cloud shows ads.
Which is updated more often, KyBook or i2Reader Cloud?
KyBook ships an update every 3 weeks, and i2Reader Cloud every 3 months. Most recently, KyBook was updated on September 25, 2026 and i2Reader Cloud on September 24, 2026.

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