Comparison

Yomu EBook Reader vs KyBook 3 Ebook Reader

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

Head to head
About

Yomu EBook Reader

An independent ebook reader designed for distraction-free reading with customizable styles and layouts. Supports a wide range of formats and offers robust library management features. Cloud synchronization is available for pro users.

Highlights
  • Customizable reading styles and themes
  • Supports EPUB, MOBI, Kindle, CBZ, CBR, PDF
  • Dynamic text and margin adjustment
  • Library organization with folders and tags
  • Cloud synchronization for books and annotations (Pro)
  • Text highlighting and note-taking
  • Widgets for quick access to books and quotes
Features
Read full description

Yomu is an independent reader for book lovers. Yomu’s design is carefully crafted for ebooks and offers custom styles for better readability and distraction-free reading. Designed to let you focus on reading, Yomu has no unnecessary preferences. Just open a book and start reading. Yomu’s fluid layout dynamically adjusts all text properties and margins depending on your preferred styles and device, giving you an optimal reading experience. FORMATS Yomu supports standard ebooks without digital rights management. Supported formats: - EPub (.epub) - Mobi (.mobi, .prc) - Kindle (.azw, .azw3, .kf8) - Comics (.cbz, .cbr) - PDF (.pdf) Choose free books from publishers such as Standard Ebooks or Project Gutenberg. Download ebooks directly from your browser or copy files from other apps. Import files with iCloud Drive, iTunes File Sharing, or from Dropbox, Google Drive, OneDrive, OPDS and Calibre. READER The reader's design is carefully crafted for ebooks and offers custom styles for better readability. Choose your favorite theme font (Lato, Georgia, Lexend, OpenDyslexic, ...), reader mode (day, sepia, grey, black, ...), select a preset or custom font size, content layout (page, scroll) and many more options. All settings can be saved as your personal default for each book. Swipe or tap to go to the next page. You can also use the book's content outline or table of contents to navigate to another chapter. While reading EPub, Mobi and Kindle books, select text to take notes or highlight favorite sections. Create bookmarks or search inside ebooks to quickly find anything you are looking for. LIBRARY Organise your books in an easy to use library. Manage your library by creating folders or tags to organize your books. Sort your collection either by title, author, series, recently read or drag and drop for a custom order. You can edit a document's title, author, summary, cover or any other meta data. Save or export your books with all information and annotations in text, markdown or json format. CLOUD Yomu's Cloud Library (pro only) stores your books and annotations securely in Apple's iCloud. Keep all your ebooks safe and at hand on whatever device. Every time you change something on one device, it's synced to all your other devices. Always have the latest version, when you start reading on your iPad and continue on your iPhone on the go. Please note that you need to be signed in on your device with the same Apple ID on all platforms. WIDGETS See your recently read books or highlighted quotes. Yomu includes widgets to quickly view and open your books and quotes. Add a widget from the gallery and choose a list from the options. Tap on an entry to continue reading where you left off. YOMU PRO Yomu is free to use and includes all basic features. Every ebook format, theme or setting is available and lets you try out the unrestricted reader. However, the free version has some limitations and does not include certain features. Upgrade to Yomu Pro to get: - Cloud Library: Store and sync your library with Apple’s iCloud. - Unlimited Documents: No limit on the number of documents. - No Advertisement: Free version can display ads. Yomu is an independent app, your purchase supports the further development. When you buy an in-app purchase, you are doing so through Apple’s App Store and agree to their terms and conditions. Payments will be charged to the credit card of your Apple account. SERVICE Yomu is available for iPhone, iPad and Mac. In contrast to other apps, Yomu does not collect or sell any personal information. And it keeps your data private. Terms of Service: https://www.yomu-reader.com/terms/ Privacy Policy: https://www.yomu-reader.com/privacy/ Support: https://www.yomu-reader.com/support/

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

Screenshots

Yomu EBook Reader4 screens
KyBook 3 Ebook Reader4 screens

Verdict

The call

The clearest difference is update cadence: KyBook 3 Ebook Reader at every 5 days against Yomu EBook Reader's monthly. KyBook 3 Ebook Reader also leads on iOS requirement (11.0 vs 17.0). Yomu EBook Reader's advantage is review sentiment (80% vs 61%). 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. Yomu EBook Reader sells 2 one-off in-app purchases and KyBook 3 Ebook Reader sells 4 in-app purchases, starting at $4.49 per 3 months. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Yomu EBook Reader against 4.7 for KyBook 3 Ebook Reader. Both are backed by a comparable volume of ratings — 1.6K and 4.7K respectively. Written reviews are what separate them: 80% of Yomu EBook Reader's written reviews are positive against 61% of KyBook 3 Ebook Reader's.

UpkeepUpdate frequency

Yomu EBook Reader ships an update monthly, KyBook 3 Ebook Reader every 5 days. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

Scorecard3 real differences · 7 level
Yomu EBook Reader versus KyBook 3 Ebook Reader: the parameters behind the verdict, then further details
ParameterYomu EBook ReaderKyBook 3 Ebook Reader
PriceFreeFree
Rating4.8 (1.6K ratings) — better4.7 (4.7K ratings)
Positive reviews80.2% of reviews — better61.0% of reviews
Number of ratings1.6K4.7K — better
Update frequencyMonthlyEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS17.011.0 — better
Further details — not scored
Size61 MB53 MB
Age rating4+17+
DeveloperBeat RaessKonstantin Bukreev

Customer experience

Yomu EBook Reader

All ratings1,625 ratings
Positive95.4%
Neutral1.9%
Negative2.6%
Written reviews757 reviews
Positive80.2%
Neutral6.7%
Negative13.1%

KyBook 3 Ebook Reader

All ratings4,616 ratings
Positive91.6%
Neutral3.2%
Negative5.2%
Written reviews677 reviews
Positive61.0%
Neutral10.0%
Negative29.0%

User reviews

Yomu EBook Reader

From 1.6K App Store ratings

What we love

  • 🚀 Customizable reading experience
  • 📚 Supports wide range of file formats
  • 💻 Seamless sync across devices
  • 🔒 No DRM or subscription issues
  • 🗂️ Effective organization with folders and tags

Room to improve

  • 🐛 Occasional bugs with highlighting and page turning
  • 🔍 Limited search functionality
  • 📚 Lack of nested folders for better organization
  • 🔧 Some customization options could be improved
  • 🖼️ Thumbnails/cover art could be larger

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

Bugs and requests

Yomu EBook Reader

Reported bugs

4 issues
  • Occasional crashes or freezes
  • Inconsistent behavior when swiping to turn pages
  • Syncing issues between devices
  • Formatting problems with certain ebook files

Requested features

6 requests
  • Add support for text-to-speech
  • Improve PDF handling with annotation and text selection
  • Implement nested folder structure for better organization
  • Expand font and theme customization options
  • Introduce a continuous scrolling mode
Show 1 more
  • Add a more prominent 'return to last read position' feature

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

In-app purchases

2 purchases

Yomu EBook Reader

One-time2
  • Yomu Pro$7.99
  • Yomu Pro (Karma)$12.99
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

Questions

Is Yomu EBook Reader free?
Yomu EBook Reader is free to download, with in-app purchases available.
Is KyBook 3 Ebook Reader free?
KyBook 3 Ebook Reader is free to download, with in-app purchases available.
Which has better reviews, Yomu EBook Reader or KyBook 3 Ebook Reader?
Yomu EBook Reader is rated higher. Yomu EBook Reader averages 4.8 out of 5 from 1.6K ratings, while KyBook 3 Ebook Reader averages 4.7 from 4.7K ratings.
Do Yomu EBook Reader or KyBook 3 Ebook Reader have ads?
Neither Yomu EBook Reader nor KyBook 3 Ebook Reader shows ads.
Which is updated more often, Yomu EBook Reader or KyBook 3 Ebook Reader?
Yomu EBook Reader ships an update monthly, and KyBook 3 Ebook Reader every 5 days. Most recently, Yomu EBook Reader was updated on November 1, 2026 and KyBook 3 Ebook Reader on October 29, 2026.

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