Comparison

KyBook 3 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 3 Ebook Reader

This app is a versatile e-book reader and cataloger supporting numerous formats like EPUB, MOBI, and PDF. It offers a comfortable reading experience with customizable options, powerful annotation tools, and seamless cloud storage integration. Organize your library with tags, collections, and a handy cataloguer.

Highlights
  • Supports all major e-book formats
  • OPDS catalog access
  • Comfortable reading mode with themes
  • Powerful annotations and summary editor
  • Handy cataloguer with tagging
  • Cloud storage integration
Features
Read full description

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, fb2.zip) • 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 • Page text recognition (OCR) 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 http://kybook-reader.com/terms http://kybook-reader.com/privacy-policy

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
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 3 Ebook Reader4 screens
eBoox4 screens

Verdict

The call

The clearest difference is in-app purchases: eBoox at none against KyBook 3 Ebook Reader's 4. eBoox also leads on review sentiment (88% vs 61%) and iOS requirement (9.0 vs 11.0). KyBook 3 Ebook Reader's advantage is update cadence (every 5 days 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 3 Ebook Reader sells 4 in-app purchases, starting at $4.49 per 3 months. 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 3 Ebook Reader against 4.8 for eBoox. Both are backed by a comparable volume of ratings — 4.7K and 3.8K respectively. Written reviews are what separate them: 61% of KyBook 3 Ebook Reader's written reviews are positive against 88% of eBoox's.

UpkeepUpdate frequency

KyBook 3 Ebook Reader ships an update every 5 days, eBoox monthly. Both last shipped on October 26, 2026.

Scorecard5 real differences · 5 level
KyBook 3 Ebook Reader versus eBoox: the parameters behind the verdict, then further details
ParameterKyBook 3 Ebook ReadereBoox
PriceFreeFree
Rating4.7 (4.7K ratings)4.8 (3.8K ratings) — better
Positive reviews60.9% of reviews88.4% of reviews — better
Number of ratings4.7K — better3.8K
Update frequencyEvery 5 days — betterMonthly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.09.0 — better
Further details — not scored
Size53 MB177 MB
Age rating17+4+
DeveloperKonstantin BukreevREDIT, OOO

Customer experience

KyBook 3 Ebook Reader

All ratings4,616 ratings
Positive91.6%
Neutral3.2%
Negative5.2%
Written reviews676 reviews
Positive60.9%
Neutral10.1%
Negative29.0%

eBoox

All ratings3,544 ratings
Positive94.7%
Neutral1.7%
Negative3.6%
Written reviews1,822 reviews
Positive88.4%
Neutral4.3%
Negative7.3%

User reviews

KyBook 3 Ebook Reader

From 4.7K App Store ratings

What we love

  • 🚀 Excellent design, close to no ads
  • 🚀 Handles various file formats well
  • 👍 Customizable, lots of features
  • 👍 Stable and fast
  • 👍 Good for reading comics/manga

Room to improve

  • 🐛 Sync and account issues
  • 🐛 Crashes, bugs, and compatibility problems
  • 🔍 Confusing interface, hard to use
  • 💰 Paid features and subscription model
  • 🔍 Missing key features like page turn animation

eBoox

From 3.8K 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 3 Ebook Reader

Reported bugs

5 issues
  • Inability to open/read certain file formats
  • Sync and account creation issues
  • Problems with PDF and image display
  • Crashes and compatibility problems
  • Duplication of books in library

Requested features

6 requests
  • Left alignment option
  • Dark mode/OLED black theme
  • Improved image handling
  • Better support for Chinese language
  • Vertical page flip
Show 1 more
  • Improved text-to-speech capabilities

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

4 purchases

KyBook 3 Ebook Reader

Subscriptions2
  • 3 months subscription7 Days trial$4.493 Months
  • Yearly subscription7 Days trial$14.991 Year
One-time2
  • Upgrade to Pro (Discount)$2.99
  • Upgrade to Pro$4.99
None

eBoox

No in-app purchases

Questions

Is KyBook 3 Ebook Reader free?
KyBook 3 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 3 Ebook Reader or eBoox?
eBoox is rated higher. KyBook 3 Ebook Reader averages 4.7 out of 5 from 4.7K ratings, while eBoox averages 4.8 from 3.8K ratings.
Do KyBook 3 Ebook Reader or eBoox have ads?
Neither KyBook 3 Ebook Reader nor eBoox shows ads.
Which is updated more often, KyBook 3 Ebook Reader or eBoox?
KyBook 3 Ebook Reader ships an update every 5 days, and eBoox monthly. Most recently, KyBook 3 Ebook Reader was updated on October 26, 2026 and eBoox on October 26, 2026.

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