KOReader

KOReader

KOReader is an open source document viewer and ebook reader application designed for e-ink devices. It supports a variety of ebook formats and offers features like annotations, bookmarks, and dictionary lookups.
KOReader image
ebook reader epub pdf annotations dictionary bookmarks

KOReader: Open Source Ebook Reader for E-Ink Devices

An open source document viewer and ebook reader application designed for e-ink devices, supporting various ebook formats with features like annotations, bookmarks, and dictionary lookups.

What is KOReader?

KOReader is an open source document viewer and ebook reader application originally created for Kindle e-readers. It has since expanded support to other e-ink devices such as Kobo, PocketBook, Onyx Boox, and Android tablets.

Some key features of KOReader include:

  • Support for a wide variety of ebook formats including EPUB, MOBI, FB2, PDF, DjVu, CBZ, CBR, and more
  • Annotations and bookmarks sync across devices
  • Customizable reading experience with options for font, margin size, line spacing etc.
  • Dictionary lookups, table of contents navigation, search
  • Supports adding online OPDS catalogs to download more books directly in the app
  • Designed specifically for e-ink screens to optimize refresh rates and eyestrain

As an open source ebook reader, KOReader is free to use and allows users full control to customize their reading experience. It offers advanced features tailored for power users while maintaining ease-of-use for casual readers.

KOReader Features

Features

  1. Supports a wide variety of ebook formats including EPUB, MOBI, PDF, DjVu, CBR, CBZ, etc.
  2. Customizable reading experience - fonts, margins, themes, etc.
  3. Annotations and bookmarks support
  4. Dictionary lookups
  5. Supports adding online OPDS catalogs
  6. Sync reading positions across devices
  7. Text-to-speech
  8. Wikipedia integration
  9. Supports adding custom online content sources

Pricing

  • Open Source

Pros

Free and open source

Highly customizable

Active development and community support

Works well on e-ink devices

Cons

Limited format support on some platforms

Can be resource intensive on older/limited hardware

Lacks some features found in commercial e-reader apps


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