Open Source KOReader Alternatives for Android

There are many alternatives to KOReader for Android if you are looking for a replacement. The best open source Android alternative is Readest. If that doesn't suit you, our users have ranked more than 50 alternatives to KOReader and many of them are open source and available for Android so hopefully you can find a suitable replacement. Other interesting open source Android alternatives to KOReader are Librera Reader, Koodo Reader, MuPDF and Book's Story.

filter to find the best alternatives

KOReader alternatives are mainly Ebook Readers, but if you're looking for PDF 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. Readest icon

    Readest

     45 likes

    Readest is a modern, open-source ebook reader for Windows, macOS, Linux, iOS, Android, and the web.

    18 Readest alternatives

    Cost / License

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Flathub
    • Flatpak
    Annotation
     
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    1
  2. Librera Reader icon

    Librera Reader

     81 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.

    72 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
  5. MuPDF icon

    MuPDF

     164 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.

    99 MuPDF alternatives

    Cost / License

    Application types

    Platforms

    • Windows
    • Linux
    • Android
    • F-Droid
    • Xfce
    MuPDF screenshot 1
     
  9. Storyteller icon

    Storyteller

     26 likes

    Storyteller is a self-hosted platform for creating and reading ebooks with synced narration. It's made of three components: the API server, the web interface, and the mobile apps. Together, these components allow you to take audiobooks and ebooks that you already own and...

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Platforms

    • Android
    • iPhone
    • Self-Hosted
    • Docker
    Storyteller screenshot 1
     
  10. Episteme Reader icon

    Episteme Reader

     9 likes

    Episteme Reader is an offline-first application designed for reading various document formats. It leverages native Android technologies and C++ libraries to provide a performant reading experience with customization capabilities.

    Cost / License

    Application types

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    • Windows
    Episteme Reader screenshot 1
     
  11. uRead icon

    uRead

     10 likes

    Discover uRead, your ultimate companion for reading and listening! Whether you’re a casual reader or a book enthusiast, uRead transforms your experience with advanced features and a user-friendly design.

    Cost / License

    Application types

    Platforms

    • Android
    • Android Tablet
    uRead screenshot 1
     
  13. Cool Reader icon

    Cool Reader

     67 likes

    Cool Reader is fast and small cross-platform XML/CSS based eBook reader for desktops and handheld devices. Understands a number of text document formats, suppurt OPDS (in new ui-opengl version). Fully customizable palette, text reformatting with any font size, font...

    102 Cool Reader alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Windows
    • Linux
    • Android
    • Android Tablet
    • Haiku
    Android version
     
  14. Secure PDF Viewer icon

    Secure PDF Viewer

     18 likes

    Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Platforms

    • Android
    Secure PDF Viewer screenshot 1
     
12 of 21 KOReader alternatives