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Open Source calibre Alternatives

The best open source alternative to calibre is MuPDF. If that doesn't suit you, our users have ranked more than 100 alternatives to calibre and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to calibre are Foliate, Librera Reader, Document Viewer and Cool Reader .

calibre alternatives are mainly eBook Readers but may also be eBook Libraries or PDF Readers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of calibre.
This page was last updated May 16, 2022
calibre
  1249
  • Free • Open Source
  • Mac
  • Windows
  • Linux
  • BSD
  • Self-Hosted

Calibre is a free and open source e-book library management application made by users, for users. Many languages, designed...

Learn more about calibre

  1. MuPDF

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    • Free • Open Source
    • Windows
    • Linux
    • Android
    • iPhone
    • iPad
    • F-Droid
    • Xfce

    MuPDF is a highly versatile, customizable PDF and XPS interpreter solution that can be used across a wide range of applications as a PDF renderer, viewer, or toolkit.

  2. A simple and modern eBook viewer.

  4. 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.

  5. Document Viewer

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    • Free • Open Source
    • Android
    • Android Tablet
    • F-Droid

    Document Viewer is a highly customizable document viewer for Android, fork of the last GPL version of EBookDroid .

    Some users think Document Viewer is a great alternative to calibre, some don't.

  6. Cool Reader

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    • Free • Open Source
    • Linux
    • Android
    • Android Tablet

    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).

    Cool Reader vs calibre opinions
    Some users think Cool Reader is a great alternative to calibre, some don't.

    Not management system, only reader.

    Negative comment • almost 5 years ago
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    8

  8. KOReader

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    • Free • Open Source
    • Linux
    • Android
    • Kobo
    • PocketBook Reader
    • Kindle Fire

    KOReader is a document viewer for E Ink devices. Supported fileformats include EPUB, PDF, DjVu, XPS, CBT, CBZ, FB2, PDB, TXT, HTML, RTF, CHM, DOC, MOBI and ZIP files. It’s available for Kindle, Kobo, PocketBook, Android and desktop Linux.

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  9. Bookworm

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    • Free • Open Source
    • Linux

    Read the books you love without having to worry about different format complexities like epub, pdf, mobi, cbr, etc.

    Bookworm vs calibre opinions
    This alternative is disputed. Bookworm is still a legitimate alternative to calibre, but it might have issues that some users think are important.
    sedeti

    That's just a reader, nothing else

    Negative comment • about 1 year ago
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    0

    Focused on reading, not library management. Can't convert between formats.

    Negative comment • about 3 years ago
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    3

  10. Calibre Web

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    • Free • Open Source
    • Self-Hosted

    Calibre Web is a web app providing a clean interface for browsing, reading and downloading eBooks using an existing Calibre database.

  11. Thorium Reader is a free, open source multi-language EPUB reader for Windows 10, MacOS and Linux. It's privacy aware and highly accessible for visually impaired and dyslexic people.

  12. Koodo Reader

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    • Free • Open Source
    • Mac
    • Windows
    • Linux
    • Online

    A modern eBook reader for epub, pdf, mobi, azw3 and txt, supporting Windows, macOS, Linux and Web.

    Koodo Reader vs calibre opinions
    pros, cons and recent comments
    RemovedUser

    I use the web-based platform and it's just very good. Super intuitive and minimalistic but with great functionalities and customization. And it's FOSS.

    Positive comment • 6 months ago
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    0
Showing 10 of 29 alternatives