Comparison

FBReader 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

FBReader

A fast and versatile e-book reader supporting multiple formats like ePub, Kindle, and fb2. It offers cloud syncing for reading progress and a customizable interface. Upgrade to unlock unlimited library access and advanced features.

Highlights
  • Supports ePub, Kindle azw3, fb2, RTF, Word, HTML, and text
  • ePub3 and Readium LCP DRM support
  • Cloud syncing of library and reading positions
  • Customizable appearance and behavior options
  • Direct opening of downloaded files
  • Free version with library limits
Features
Read full description

FBReader is a fast and easy-to-use e-book reader for iPhone and iPad. It supports all major e-book formats, including ePub (with key ePub3 features), Kindle azw3, and fb2 (.zip). You can open both unprotected books and ePub files protected with Readium LCP DRM. FBReader also reads RTF, Word (.doc), HTML, and plain text, so you can keep all your books and documents in one place. Read anywhere and pick up right where you left off. FBReader can sync your library, reading positions, bookmarks, and more across devices using the FBReader Book Network, a cloud service powered by Google Drive. If you prefer managing files yourself, you can download books in your browser and open them directly with FBReader. A wide range of appearance and behavior options lets you customize the reading experience to match your preferences. Free version and upgrade options: • The free version allows up to 10 books in your library. • The built-in translation feature is disabled. Upgrade to the full version to remove these limits and enjoy the complete FBReader experience.

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

FBReader4 screens
KyBook 3 Ebook Reader4 screens

Verdict

The call

The clearest difference is rating: KyBook 3 Ebook Reader at 4.7 against FBReader's 3.7. KyBook 3 Ebook Reader also leads on update cadence (every 5 days vs monthly) and ratings volume (4.6K vs 128). 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. FBReader sells 1 one-off in-app purchase 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

KyBook 3 Ebook Reader holds the better App Store score, 4.7 against 3.7. That said, the two scores are not equally well evidenced: KyBook 3 Ebook Reader has 4.6K ratings behind it against 128, so its average is the more settled of the two. Written reviews point the same way: 52% of FBReader's written reviews are positive against 61% of KyBook 3 Ebook Reader's.

UpkeepUpdate frequency

FBReader ships an update monthly, KyBook 3 Ebook Reader every 5 days. The most recent releases landed on October 15, 2026 and October 16, 2026 respectively.

Scorecard5 real differences · 5 level
FBReader versus KyBook 3 Ebook Reader: the parameters behind the verdict, then further details
ParameterFBReaderKyBook 3 Ebook Reader
PriceFreeFree
Rating3.7 (128 ratings)4.7 (4.6K ratings) — better
Positive reviews52.5% of reviews60.9% of reviews — better
Number of ratings1284.6K — better
Update frequencyMonthlyEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS13.011.0 — better
Further details — not scored
Size22 MB53 MB
Age rating17+17+
DeveloperFBReader.ORG LimitedKonstantin Bukreev

Customer experience

FBReader

All ratings128 ratings
Positive64.8%
Neutral9.4%
Negative25.8%
Written reviews322 reviews
Positive52.5%
Neutral14.0%
Negative33.5%

KyBook 3 Ebook Reader

All ratings4,616 ratings
Positive91.6%
Neutral3.2%
Negative5.2%
Written reviews675 reviews
Positive60.9%
Neutral10.1%
Negative29.0%

User reviews

FBReader

From 128 App Store ratings

What we love

  • 🚀 Fast and smooth reading experience
  • 👍 Simple and intuitive interface
  • 💡 Customizable font, margin, and layout options
  • 🔒 Secure syncing across devices
  • 🎨 Retro background textures

Room to improve

  • 🐛 Occasional crashes and freezes
  • 🔧 Lack of advanced organization features (folders, shelves)
  • 🚫 No PDF support
  • 🔍 Inconsistent search and book discovery
  • 🔒 Privacy concerns around data collection

KyBook 3 Ebook Reader

From 4.6K 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

FBReader

Reported bugs

4 issues
  • Syncing issues with Google Drive
  • Deletion of books from library
  • Formatting problems with large footnotes
  • Compatibility issues with newer iOS versions

Requested features

5 requests
  • Vertical scrolling mode
  • Improved bookmark and annotation tools
  • Ability to add/change book covers
  • Text-to-speech functionality
  • Better library management (read/unread, collections)

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

1 purchases

FBReader

One-time1
  • FBReader Full Edition2 variants$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 FBReader free?
FBReader 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, FBReader or KyBook 3 Ebook Reader?
KyBook 3 Ebook Reader is rated higher. FBReader averages 3.7 out of 5 from 128 ratings, while KyBook 3 Ebook Reader averages 4.7 from 4.6K ratings.
Do FBReader or KyBook 3 Ebook Reader have ads?
Neither FBReader nor KyBook 3 Ebook Reader shows ads.
Which is updated more often, FBReader or KyBook 3 Ebook Reader?
FBReader ships an update monthly, and KyBook 3 Ebook Reader every 5 days. Most recently, FBReader was updated on October 15, 2026 and KyBook 3 Ebook Reader on October 16, 2026.

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