Features & Capabilities

KyBook 3 Ebook Reader is a versatile reader and cataloger that supports major formats including EPUB, PDF, MOBI, DJVU, CBZ/CBR, FB2, and more. It integrates OPDS catalogs and cloud storage, offers comfortable reading modes, typography customization, auto scrolling, and text-to-speech for hands-free listening. Built for large books and offline use, it emphasizes speed and energy efficiency.

Key features include powerful annotations with export options, a built-in summary editor with Markdown export, a robust cataloguer with metadata and table-of-contents editing, and extensive storage options (local, cloud, WebDAV, and network shares). It also supports synchronization via subscription, offline search, and full-text search across books, making KyBook a comprehensive solution for reading, organizing, and annotating your eBook collection.

User Growth & Download Statistics

Contact the developer

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Developed by:
Konstantin Bukreev
Apple Apps Store
https://apps.apple.com/us/app/kybook-3-ebook-reader/id1348198785
Website:
http://kybook-reader.com/

User Reviews

Users praise KyBook 3 for strong PDF handling, deep library organization (folders, tagging, metadata), and a feature-rich experience with OPDS access. However, recurring issues dampen enthusiasm: the app feels poorly maintained with years of no updates; subscription prompts and unclear pricing frustrate users; login and cloud-sync problems block syncing; and performance bugs like lag after updates. Overall, it’s powerful and customizable, but reliability and ongoing maintenance are major concerns.
Pros
  • Excellent library organization with folders and strong tagging/metadata
  • Strong PDF support with fast rendering
  • Feature-rich experience (annotations/notes, TTS, translation, metadata editing)
  • OPDS support and access to third-party online libraries
Cons
  • Not maintained / appears abandoned; no updates for years
  • Subscription prompts and unclear pricing; frustrating paid model
  • Login and cloud-sync issues blocking account creation or syncing
  • Performance problems like lag and unresponsiveness after updates
Recent reviews
I can’t live without this ebook reader. There are so many bells and whistles, and it is just not that difficult to figure out.
by BD*****, 2026-05-27

the main reason i use the app was broken, i got the junky default voice no matter if i choose a downloaded better version. however this seems to be fixed now!
by wr*****, 2026-04-27

Очень Крутая читалка но на айфоне немного глючит. Читает знаки скобок и не ставится на паузу с наушников. А если поставить то не запускается обратно. Но это мне кажется в айфоне проблема а так супер суперский советую
by Ба*****, 2026-04-14
View all user reviews ›

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