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KyBook 3 review

Freemium#9 of 27 in Ebook Reader Software

A format-rich Apple ebook library with OPDS, annotations, storage connections, and optional sync.

8.3/10Editor score
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

KyBook 3 is an ebook reading and cataloguing app for iPhone, iPad, and compatible Apple Silicon Macs. It is aimed at readers managing libraries from multiple sources and in varied formats, including EPUB, PDF, MOBI, AZW3, DjVu, FictionBook, comic-book, audiobook, TXT, and RTF files. The free plan covers ebook reading and cataloguing, OPDS catalogs, cloud storage connections, and annotations. Reading tools include highlights, bookmarks, drawn annotations, text-to-speech, full-text search, and customizable reading modes.

Its main strength is library and source flexibility. KyBook 3 can access custom OPDS catalogs and connect with iCloud Drive, Google Drive, OneDrive, Dropbox, Yandex Disk, SMB/CIFS shared folders, WebDAV, and other local or network storage options. Within the library, readers can use categories, tags, collections, and folders, while metadata and tables of contents can be edited. That combination suits users who maintain files across personal storage, network folders, and catalog services rather than relying on one storefront. Readers seeking a simpler, single-source experience may not need this breadth.

The paid options add a Pro app upgrade, while the three-month and yearly subscription plans add ebook metadata and file synchronization. Optional synchronization is useful for readers moving between iOS and macOS, but it is separate from the free plan. The Apple-only focus also narrows its fit, and the app is listed as designed for iPad rather than verified for macOS. KyBook 3 makes the most sense for Apple users who value format support, catalog access, and detailed library organization; readers needing broader platform coverage or a newer listed release should look elsewhere.

KyBook 3 pros and cons

  • Where it wins
    • Supports ebooks, comics, audiobooks, text, and rich-text files
    • Connects to OPDS, cloud, local-network, and WebDAV storage
    • Combines annotations, metadata editing, search, and organization tools
  • Where it doesn't
    • Available on iOS and macOS rather than broader platforms
    • Optional synchronization is tied to subscription plans
    • The latest listed version is 0.7.8 from February 2019

KyBook 3 fact sheet, pricing and score →

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