KOReader AlternativesOnly apps categorised as PDF Readers

The best PDF Reader alternative to KOReader is SumatraPDF, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to KOReader and many of them are PDF Readers so hopefully you can find a suitable replacement. Other interesting PDF Reader alternatives to KOReader are calibre, Okular, Librera Reader and MuPDF.

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KOReader alternatives are mainly PDF Readers, but if you're looking for Ebook Readers or Ebook Libraries you can filter on that. Other popular filters include Android and Android + Open Source. These are just examples - use the filter bar below to find more specific alternatives to KOReader.
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Alternatives list

  1. SumatraPDF icon

    SumatraPDF

     1669 likes

    This free, open-source viewer for Windows supports multiple formats like PDF, eBooks (ePub, Mobi), CHM, and Comic Books (CBZ, CBR). Prioritizing simplicity and speed, it offers a lightweight, portable design with a minimalist interface, catering to users seeking fast and efficient document viewing.

    108 SumatraPDF alternatives

    Cost / License

    Application types

    Platforms

    • Windows
    SumatraPDF screenshot 1
     

    • SumatraPDF is the most popular Windows alternative to KOReader.

    • SumatraPDF is the most popular Open Source & free alternative to KOReader.

    • SumatraPDF is Free and Open SourceKOReader is also Free and Open Source
    • SumatraPDF is Privacy focusedKOReader is not according to our users
  2. calibre icon

    calibre

     1488 likes

    Free e-book manager with features including library management, format conversion, syncing to devices, internet-independent operation, built-in viewer, news download as e-books, text-to-speech, privacy focus, extensible plugins, and no registration or tracking.

    113 calibre alternatives

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    • Self-Hosted
    • Flathub
    • PortableApps.com
    • Homebrew
    calibre screenshot 1
     
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    1
    Comments about calibre as an Alternative to KOReader
    William Hay
    0

    Not the same functionality. One is an e-book reader. The other is an e-book manager

    Review by a new / low-activity user.
    KOReader Icon
    calibre icon

    • calibre is the most popular Mac, Linux & Self-Hosted alternative to KOReader.

    • calibre is Free and Open SourceKOReader is also Free and Open Source
    • calibre is Customizable and Privacy focusedKOReader is not according to our users
  4. Okular icon

    Okular

     480 likes

    Multi-platform document viewer offering extensive format support, including PDF, comics, images, EPUB, and Markdown, with annotation tools, sidebar previews, text-to-speech, DRM management, cross-platform compatibility, and integration with KDE Frameworks libraries.

    113 Okular alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Windows
    • Linux
    • BSD
    • KDE Plasma
    • Snapcraft
    • Linux Mobile
    • Flathub
    • Haiku
    Okular screenshot 1
     
  5. Librera Reader icon

    Librera Reader

     77 likes

    Librera Reader is a highly customizable and feature-rich application for reading books in PDF, EPUB, MOBI, DjVu, FB2, TXT, RTF, AZW, AZW3, HTML, CBZ, CBR formats on Android devices.

    65 Librera Reader alternatives

    Cost / License

    • Freemium
    • Open Source

    Application types

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    Librera Reader screenshot 1
     
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    1
    Comments about Librera Reader as an Alternative to KOReader
    Guest
    Positive
    0

    easy to get via github even if you have no access to google's service

    Review by a new / low-activity user.
    KOReader Icon
    Librera Reader icon

    • Librera Reader is the most popular Android & Android Tablet alternative to KOReader.

    • Librera Reader is Freemium and Open SourceKOReader is Free and Open Source
    • Librera Reader is Customizable and Privacy focusedKOReader is not according to our users
  6. MuPDF icon

    MuPDF

     157 likes

    MuPDF offers a highly versatile PDF, XPS, and eBook interpreter, customizable as a renderer, viewer, or toolkit. Features include digital signatures, redactions, form filling, annotations, and page manipulation, ideal for mobile, eBooks, and embedded apps supporting Java, C++, and Python.

    89 MuPDF alternatives

    Cost / License

    Application types

    Platforms

    • Windows
    • Linux
    • Android
    • F-Droid
    • Xfce
    MuPDF screenshot 1
     
  7. Koodo Reader icon

    Koodo Reader

     60 likes

    Koodo Reader is an all-in-one e-book reader that can help you better manage and study your e-books. It's free and open-source.

    28 Koodo Reader alternatives

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Flathub
    Koodo Reader screenshot 1
     

    • Koodo Reader is the most popular Web-based alternative to KOReader.

    • Koodo Reader is Free and Open SourceKOReader is also Free and Open Source
    • Koodo Reader is Customizable and Privacy focusedKOReader is not according to our users
  9. Readest icon

    Readest

     27 likes

    Readest is a modern, feature-rich ebook reader designed for avid readers offering seamless cross-platform access, powerful tools, and an intuitive interface to elevate your reading experience.

    14 Readest alternatives

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Flathub
    • Flatpak
    • Android Tablet
    Annotation
     

    • Readest is the most popular iPhone & iPad alternative to KOReader.

    • Readest is Free and Open SourceKOReader is also Free and Open Source
    • Readest is Privacy focusedKOReader is not according to our users
  10. PDFgear icon

    PDFgear

     55 likes

    Read, edit, convert, merge, and sign PDF files across devices, for completely free and without signing up.

    46 PDFgear alternatives

    Cost / License

    • Free
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    PDFgear screenshot 1
     
  11. Book's Story icon

    Book's Story

     33 likes

    Material3 eBook reader - Book's Story. Built with Jetpack Compose. Free & Open Source & Ad Free. 4 supported file formats (.txt, .pdf, .epub, .fb2), 2 supported languages. Lots of customization.

    Cost / License

    Application types

    Platforms

    • Android
    • F-Droid
    Book's Story screenshot 1
     
  13. ReadEra icon

    ReadEra

     56 likes

    Read book files in EPUB, PDF, DOC, DOCX, RTF, TXT, DJVU, FB2, MOBI and CHM formats. Supports chapters, bookmarks, page style. Saves the current reading position. Automatic detection and display of the list of all supported documents on your device.

    77 ReadEra alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Android
    ReadEra screenshot 1
     
12 of 39 KOReader alternatives