- Home
- Ebook Reader Software
- KyBook 3
KyBook 3
What it is
KyBook 3 is an e-book reading and cataloging app for iOS, with macOS also listed as a supported platform. It supports formats including EPUB, PDF, DjVu, MOBI, AZW3, FictionBook, comics, audiobooks, plain text, and rich text. Reading options include day, night, and sepia themes, several page-turn styles, auto scrolling, and text-to-speech. Readers can mark passages, add bookmarks, or draw annotations, then export annotations as Markdown, HTML, PDF, or RTF. The app connects to OPDS catalogs, includes a catalog list, and allows users to add catalogs such as a Calibre content server. Supported storage includes iCloud Drive, Google Drive, OneDrive, Dropbox, Yandex Disk, SMB/CIFS shared folders, and WebDAV. KyBook 3 can serve device files over Wi-Fi and stream audiobooks from cloud storage. A subscription is required to synchronize reading data and related records; Pro features require a one-time in-app purchase. The maker lists a 64-bit device and iOS 11 minimum, and macOS 11 or later on an Apple M1 Mac.
For and against
For
- Supports ebook, comic, audiobook, and text formats.
- Exports annotations in four listed formats.
- Connects to OPDS catalogs and personal catalog sources.
- Streams audiobooks from cloud storage.
- Free download with in-app purchases.
Against
- Synchronization requires a subscription.
- Pro features require an in-app purchase.
- Maker requires a 64-bit device and iOS 11 minimum.
- App Store lists macOS support only on Apple M1 Macs running macOS 11 or later.
The verdict
KyBook 3 combines format support, cataloging, annotations, and several storage options in a reading app. Some listed capabilities require a subscription or one-time Pro purchase, and the stated device requirements are worth checking.
Who it suits
KyBook 3 suits readers who want to organize and read varied ebook, comic, and audiobook formats. It may also suit readers who use OPDS catalogs or cloud and network storage.
Plans and prices
Free
Reading and cataloguing; in-app purchases available
Read 15 Oct 2026 · apps.apple.com
Upgrade to Pro (Discount)
Discounted Pro upgrade
Read 15 Oct 2026 · apps.apple.com
3 months subscription
Synchronizes ebook metadata and files
Read 15 Oct 2026 · apps.apple.com
Upgrade to Pro
Pro features; batch OPDS downloads and batch metadata editing require Pro
Read 15 Oct 2026 · apps.apple.com
Yearly subscription
Synchronizes ebook metadata and files
Read 15 Oct 2026 · apps.apple.com
On the record
- Annotations
- Readers can highlight, bookmark and draw annotations with Apple Pencil or touch, then export them as Markdown, HTML, PDF or RTF.apps.apple.com · read 15 Oct 2026
- API and SDK
- The reviewed official pages describe no public KyBook API, SDK or developer integration interface.kybook-reader.com · read 15 Oct 2026
- Catalogs
- It supports OPDS catalogs, includes a list of known catalogs and allows users to add their own, such as a Calibre content server.github.com · read 7 Oct 2026
- Company identity
- The App Store identifies the seller and developer as Konstantin Bukreev.apps.apple.com · read 15 Oct 2026
- Content server
- A built-in content server exposes device files over Wi-Fi through a web browser.apps.apple.com · read 15 Oct 2026
- Device requirements
- The maker's page says KyBook 3 requires a 64-bit device and iOS 11 minimum; the App Store lists iPhone and iPad compatibility and macOS 11 or later on an Apple M1 Mac.github.com · read 7 Oct 2026
- Documentation
- The official help URL exists, while the public site repository provides feature pages and a dated changelog rather than an API manual.kybook-reader.com · read 15 Oct 2026
- Formats
- It supports EPUB, PDF, DjVu, MOBI/AZW3, FictionBook, comic book, audiobook, plain text and rich text formats.github.com · read 7 Oct 2026
- Latest listed version
- The App Store lists version 0.7.8, released February 23, 2019.apps.apple.com · read 15 Oct 2026
- Library organization
- Cataloguing supports categories, tags, collections, folder trees, flexible sorting and drag-and-drop shelf arrangement.apps.apple.com · read 15 Oct 2026
- Licence
- The public KyBook GitHub repository lists README, screenshots and issues but no license file is shown in its repository file list.github.com · read 15 Oct 2026
- Limit: interface and performance
- Independent reviewers mention a reading interface needing improvement, lag, awkward highlighting and subscription-gated features.assets-global.website-files.com · read 15 Oct 2026
- Limit: open issues
- The public issue tracker shows 461 open issues, including sync, registration, freezing, highlighting, text-to-speech and Calibre-server problems.github.com · read 15 Oct 2026
- Limit: support responsiveness
- App Store reviews describe unanswered bug reports and certificate-related sync failures.apps.apple.com · read 15 Oct 2026
- Limit: synchronization
- Reviewers report that cross-device synchronization and account creation often fail, including after paying for the subscription.justuseapp.com · read 15 Oct 2026
- Limit: update stagnation
- Reviewers complain that the app has gone years without releases and fear it has been abandoned.apps.apple.com · read 15 Oct 2026
- Maker and seller
- The App Store identifies Konstantin Bukreev as the app's developer and seller.apps.apple.com · read 7 Oct 2026
- Metadata and contents
- KyBook extracts metadata automatically and lets users edit metadata and create or edit tables of contents.apps.apple.com · read 15 Oct 2026
