Comparison

KyBook 2 Ebook Reader vs eBoox

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

Head to head
About

KyBook 2 Ebook Reader

This app is a versatile e-book reader that supports a wide range of formats including EPUB, MOBI, and PDF. It offers extensive customization for reading modes, cloud storage integration, and text-to-speech capabilities for audiobooks.

Highlights
  • Supports EPUB, MOBI, PDF, DJVU, and more
  • OPDS catalog and cloud storage integration
  • Customizable reading modes (font, theme, size)
  • Text-to-speech for e-books and audiobooks
  • Book cataloging and organization
  • Speed reading and text summarization
Features
Read full description

Attention, since October 1, 2019, the third edition of the application is available on the App Store - KyBook 3 Reader. The best way to read your books ever! KyBook supports all the major e-book formats, OPDS catalogs and Cloud Storage. Continuously developing and improving in close contact with thousands of KyBook users. Key features:

 - EPUB, FB2, RTF, PDF, DJVU, MOBI, AZW3, CBR, CBZ, CBT, MP3, M4A, M4B formats - OPDS catalogs
 - Cloud Storage - Flexible reading mode settings - Handy cataloguer - Text-to-speech technology More: - Supports e-books in EPUB (DRM-free), FictionBook (fb2, fbz, fb2.zip), TXT, RTF, PDF, DJVU, Comic Book (cbr, cbz, cbt), MobiPocket (mobi), Kindle (azw3), and Audio Book (mp3, m4a, m4b) formats. - Provides access to enormous collection of free electronic books through OPDS-catalogs support. - Finds books in your Cloud Storage or anywhere in Internet. - Saves your books into iCloud, Dropbox, Yandex Disk, Google Drive, OneDrive, Cloud Mail.ru, ownCloud (WebDAV) and Shared folders (SMB/CIFS). - Allows customize: font, colour theme, text size, text alignment mode, margins, paragraph indention, hyphenations and more. - Provides easy navigation inside the book using table of content, bookmarks or notes. - Helps organizing your books, cataloging them, grouping and sorting in different modes. - Provides detailed information about each of your book. - Allows choosing book covers from different sources, changing titles and subjects and even more. - Uses text-to-speech technology to voice any e-book. - Supports translation of text and the vocabularies in StarDict and Lingvo DSL format. - Integrates with social networking services. - Supports of archives in ZIP, RAR and TAR format. - Provides Speed Reading. - Allows to stream audio for audio books in Cloud Storage. - Supports fuzzy search and search using regular expressions in a text book. - Supports automatic text summarization and precis-writing. - Supports preview of iWork, Microsoft Office, CSV, HTML files.

About

eBoox

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
Currently charting
Read full description

eBoox – the most pleasant book reader ever! * *according to my mom :) • Cute, simple and useful UI, • Effective reading tools: bookmarks, 3-colors highlights, interactive links and notes, • Dark mode and offline reading, • Customized settings - Fonts, Fields, Text size, screen Brightness, Page scrolling, ets. • Suppots all your e-books, even in ZIP: EPUB, MOBI, DOC, DOCX, TXT, FB2, PRC, RTF, ODT, HTML, AZW, AZW3 and others text documents, • PDF supported (beta), • !Completely AD-FREE, • !Online auto SYNC of ebooks and reading progress, • !FREE WEB e-reader available! Start reading your e-books right now! Upload books via iTunes, import your files from the email, web browser, cloud storages (iCloud, Google Drive, Dropbox, Yandex.Disk etc) or share via AirDrop. In the app you will find detailed guide How to add ebooks in different ways. And we've already added three classic welcome books so you can appreciate the e-reader right away! This is a upgraded version of eBoox. The old one is no longer supported. In order not to lose your books, progress, quotes and bookmarks, install this app version. Run it on device and wait for the data transfer to finish. When you make sure that all your books appeared in eBoox 2020, you can safely delete eBoox.old. You can turn on the synchronization for backup.

Screenshots

KyBook 2 Ebook Reader4 screens
eBoox4 screens

Verdict

The call

The clearest difference is in-app purchases: eBoox at none against KyBook 2 Ebook Reader's 2. eBoox also leads on review sentiment (88% vs 68%) and chart position (#186 vs unranked). KyBook 2 Ebook Reader's advantage is update cadence (fortnightly vs monthly). On price, rating, ratings volume 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 2 Ebook Reader sells 2 one-off in-app purchases. eBoox asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for KyBook 2 Ebook Reader against 4.8 for eBoox. Both are backed by a comparable volume of ratings — 2.3K and 3.5K respectively. Written reviews are what separate them: 68% of KyBook 2 Ebook Reader's written reviews are positive against 88% of eBoox's.

UpkeepUpdate frequency

KyBook 2 Ebook Reader ships an update fortnightly, eBoox monthly. The most recent releases landed on September 26, 2026 and September 28, 2026 respectively.

Scorecard5 real differences · 6 level
KyBook 2 Ebook Reader versus eBoox: the parameters behind the verdict, then further details
ParameterKyBook 2 Ebook ReadereBoox
PriceFreeFree
Rating4.7 (2.3K ratings)4.8 (3.5K ratings) — better
Positive reviews67.6% of reviews88.1% of reviews — better
Number of ratings2.3K3.5K — better
Update frequencyFortnightly — betterMonthly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank—#186 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.1 — better9.0
Further details — not scored
Size51 MB177 MB
Age rating17+4+
DeveloperKonstantin BukreevREDIT, OOO

Customer experience

KyBook 2 Ebook Reader

All ratings2,337 ratings
Positive93.7%
Neutral2.5%
Negative3.8%
Written reviews250 reviews
Positive67.6%
Neutral6.0%
Negative26.4%

eBoox

All ratings3,544 ratings
Positive94.7%
Neutral1.7%
Negative3.6%
Written reviews799 reviews
Positive88.1%
Neutral4.6%
Negative7.3%

User reviews

KyBook 2 Ebook Reader

From 2.3K App Store ratings

What we love

  • 👍 Stable and solid
  • 👍 Customizable reading experience
  • 👍 Excellent reading app
  • 👍 Great for reading PDFs and ebooks
  • 👍 Syncs across devices

Room to improve

  • 🐛 Bugs and crashes
  • 💰 Aggressive push for paid upgrades
  • 🔍 Confusing navigation and UI
  • 📢 Intrusive ads
  • 🔒 Clipboard access concerns

eBoox

From 3.5K App Store ratings

What we love

  • 🚀 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

Room to improve

  • 🐛 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

Bugs and requests

KyBook 2 Ebook Reader

Reported bugs

4 issues
  • Books not loading properly
  • Restore purchases not working
  • Sync issues with cloud services
  • Unexpected behavior after updates

Requested features

6 requests
  • Ability to edit color themes
  • Organize books into folders
  • Annotation and note-taking features
  • Resume reading from last page
  • Goodreads integration
Show 1 more
  • Adjustable font size and brightness

eBoox

Reported bugs

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

Requested features

7 requests
  • 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
Show 2 more
  • Introduce a grid-style library view for book covers
  • Implement automatic dark mode based on system settings

In-app purchases

2 purchases

KyBook 2 Ebook Reader

One-time2
  • Upgrade to Pro Version$1.99
  • Upgrade to Pro Version$2.99
None

eBoox

No in-app purchases

Questions

Is KyBook 2 Ebook Reader free?
KyBook 2 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 2 Ebook Reader or eBoox?
eBoox is rated higher. KyBook 2 Ebook Reader averages 4.7 out of 5 from 2.3K ratings, while eBoox averages 4.8 from 3.5K ratings.
Do KyBook 2 Ebook Reader or eBoox have ads?
Neither KyBook 2 Ebook Reader nor eBoox shows ads.
Which is updated more often, KyBook 2 Ebook Reader or eBoox?
KyBook 2 Ebook Reader ships an update fortnightly, and eBoox monthly. Most recently, KyBook 2 Ebook Reader was updated on September 26, 2026 and eBoox on September 28, 2026.

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