Free calibre AlternativesEbook & PDF Readers like calibre

Alternatives list

1. 

   

   Readest

    55 likes

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

   24 Readest alternatives

   Cost / License

   • Freemium
   • Open Source (AGPL-3.0)

   Application typeApplication types

   • Ebook Reader
   • PDF Reader

   Origin

   • United States

   Since

   • Since 2024

   Platforms

   • Windows
   • Mac
   • Linux
   • Online
   • Self-Hosted
   • Android
   • iPhone
   • iPad
   • Android Tablet
   • Flathub
   • Flatpak

   • United States

   

   

   

   +2

   

   More about Readest  

   

   Good alternative?Is Readest a good alternative to calibre?

    
2. 

   

   KOReader

    90 likes

   An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Kindle, Kobo, PocketBook, Linux and Android devices.

   97 KOReader alternatives

   Cost / License

   • Free
   • Open Source (AGPL-3.0)

   Application typeApplication types

   • Ebook Reader
   • PDF Reader

   Since

   • Since 2019

   Platforms

   • Linux
   • Android
   • Linux Mobile
   • Android Tablet
   • Kindle Fire
   • Kobo Books
   • F-Droid
   • Flathub
   • OpenAPK
   • AppImageHub

   

   

   

   More about KOReader  

   

   Good alternative?Is KOReader a good alternative to calibre?

    

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   2comments

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   KOReader vs calibre Comments

   Positive comment by N.A. Ferrell · Aug 5, 2023

   A very feature-full reading app. I use it with my PocketBook Color and PocketBook InkPad Color and it is much snappier than the default reading app.

   Positive comment by Biep · Mar 15, 2025

   As an e-book reader it is unparalleled, I believe. It is not a feature-rich library management tool, though.

   2 of 2 comments

   

   

   • KOReader is Free and Open Sourcecalibre is also Free and Open Source
4. 

   

   Librera Reader

    87 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.

   83 Librera Reader alternatives

   Cost / License

   • Freemium
   • Open Source

   Application typeApplication types

   • Ebook Reader
   • PDF Reader

   Origin

   • Slovakia
   • EU

   Since

   • Since 2018

   Platforms

   • Android
   • Android Tablet
   • F-Droid
   • OpenAPK

   • Slovakia
   • EU

   

   

   

   +7

   

   More about Librera Reader  

   

   Good alternative?Is Librera Reader a good alternative to calibre?

    

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   1comment

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   Librera Reader vs calibre Comments

   Positive comment by riveravaldez · Oct 13, 2026

   Amazing tool to read on Android/AOSPs. FLOSS, available throuth F-Droid. Is there any more to ask? It can open almost any format (PDF, EPUB, DOCX, HTML, etc.), and the UI is excellent. It has a lot of tools and options. Really awesome.

   1 of 1 comments

   

   

   • Librera Reader is Freemium and Open Sourcecalibre is Free and Open Source
5. Ad

   

   

   Icecream Ebook Reader

   Reads EPUB, MOBI, FB2, and PDF files, manages digital libraries, tracks reading progress, allows notes, highlights, bookmarks, text translation, online search, night mode, full-screen, customizable layouts, text-to-speech, and di...

   https://icecreamapps.com

   Learn More
6. 

   

   Koodo Reader

    80 likes

   Koodo Reader is a powerful ebook reader designed to provide a simple and easy-to-use reading experience.

   42 Koodo Reader alternatives

   Cost / License

   • Freemium
   • Open Source (AGPL-3.0)

   Application typeApplication types

   • Ebook Reader
   • PDF Reader

   Origin

   • China

   Since

   • Since 2021

   Platforms

   • Windows
   • Mac
   • Linux
   • Online
   • Android
   • iPhone
   • iPad
   • Flathub

   • China

   

   

   

   +2

   

   More about Koodo Reader  

   

   Good alternative?Is Koodo Reader a good alternative to calibre?

    

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   2comments

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   Koodo Reader vs calibre Comments

   Positive comment by alexanderprange · Sep 10, 2022

   cleaner and significantly better user interface and user friendly.

   Positive comment by RemovedUser · Dec 23, 2021

   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.

   2 of 2 comments

   

   

   • Koodo Reader is Freemium and Open Sourcecalibre is Free and Open Source
7. 

   

   Foliate

    69 likes

   A simple and modern eBook viewer for Linux desktops.

   76 Foliate alternatives

   Cost / License

   • Free
   • Open Source (GPL-3.0)

   Application typeApplication types

   • Ebook Reader
   • PDF Reader

   Origin

   • Italy
   • EU

   Since

   • Since 2019

   Platforms

   • Linux
   • BSD
   • Flathub
   • Snapcraft

   • Italy
   • EU

   

   

   

   +3

   

   More about Foliate  

   

   Good alternative?Is Foliate a good alternative to calibre?

    

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   2comments

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   Foliate vs calibre Comments

   Negative comment by AbyssalThatRatesAppsTho · Sep 24, 2026

   You can't add books in bulk, which is something that Calibre can do easily. Makes Foliate harder to recommend as a viable alternative, especially to those with larger folders filled with Ebooks.

   Positive comment by riveravaldez · Oct 13, 2026

   For simple EPUB reading with a nice library and access to lots of open/public archives, it's a lovely alternative, with proper tools, excellent navigation and UI. FLOSS.

   2 of 2 comments

   

   

   • Foliate is Free and Open Sourcecalibre is also Free and Open Source
   • Foliate is Minimalisticcalibre is not according to our users
9. 

   

   Sigil

    132 likes

   Sigil is a multi-platform ebook editor. It is designed to edit books in ePub format.

   38 Sigil alternatives

   Cost / License

   • Free
   • Open Source (GPL-3.0)

   Application type

   • Ebook Editor

   Origin

   • Serbia

   Since

   • Since 2010

   Platforms

   • Windows
   • Mac
   • Linux
   • PortableApps.com

   • Serbia

   

   

   

   More about Sigil  

   

   Good alternative?Is Sigil a good alternative to calibre?

    
10. 

    

    Amazon Kindle

     248 likes

    The Kindle app puts millions of books, magazines, newspapers, comics, and manga at your fingertips.

    139 Amazon Kindle alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application typeApplication types

    • Ebook Reader
    • Ebook Library

    Origin

    • United States

    Since

    • Since 2010

    Platforms

    • Windows
    • Mac
    • Online
    • Android
    • iPhone
    • iPad
    • Android Tablet

    • United States

    

    

    

    More about Amazon Kindle  

    

    Good alternative?Is Amazon Kindle a good alternative to calibre?

     

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    6comments

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    Amazon Kindle vs calibre Comments

    Negative comment by Guest · Feb 16, 2019

    Amazon Kindle is a Kindle-only reading application

    Negative comment by Garrett Coakley · Mar 6, 2018

    Ereader that can only display books purchased from Amazon.

    Negative comment by Guest · Oct 7, 2017

    kindle app is a drm viewer Calibre is an organiser with viewer conversion and other open features

    3 of 6 comments

    

    

    • Amazon Kindle is Freemium and Proprietarycalibre is Free and Open Source
11. 

    

    Openlib

     36 likes

    Openlib is an open source app to download and read books from shadow library (Anna’s Archive). The App Has Built In Reader to Read Books.

    84 Openlib alternatives

    Cost / License

    • Free
    • Open Source (GPL-3.0)

    Application typeApplication types

    • Ebook Reader
    • PDF Reader

    Since

    • Since 2023

    Platforms

    • Android
    • F-Droid

    

    

    

    More about Openlib  

    

    Good alternative?Is Openlib a good alternative to calibre?

     
12. 

    

    ReadEra

     61 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.

    100 ReadEra alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application typeApplication types

    • Ebook Reader
    • PDF Reader

    Origin

    • United States

    Since

    • Since 2018

    Platforms

    • Android

    • United States

    

    

    

    +9

    

    More about ReadEra  

    

    Good alternative?Is ReadEra a good alternative to calibre?

     
13. 

    

    FBReader

     222 likes

    E-reader application.

    127 FBReader alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application typeApplication types

    • Ebook Reader
    • PDF Reader

    Origin

    • Russia

    Since

    • Since 2010

    Platforms

    • Windows
    • Mac
    • Linux
    • Android
    • iPhone
    • iPad
    • Android Tablet

    • Russia

    

    

    More about FBReader  

    

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    10comments

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    FBReader vs calibre Comments

    Negative comment by Guest · Sep 12, 2018

    The beta for Windows will be available in 2015. We're talking end 2018 now. Furthermore it is a reader only. Calibre is a book management system.

    Negative comment by Guest · Jun 19, 2018

    Calibre is about organization, library management, and conversion between different formats for just about any device. The fact that it happens to have a reader is almost inconsequential, thus recomending a piece of software that only reads is very unhelpful.

    Negative comment by Guest · Mar 4, 2018

    FBReader is just an eBook reader. Not an organizer

    3 of 10 comments

    

    

    • FBReader is Freemium and Proprietarycalibre is Free and Open Source
14. 

    

    Episteme Reader

     12 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.

    63 Episteme Reader alternatives

    Cost / License

    • Freemium
    • Open Source (AGPL-3.0)

    Application typeApplication types

    • Ebook Reader
    • PDF Reader

    Origin

    • India

    Since

    • Since 2026

    Platforms

    • Windows
    • Linux
    • Debian
    • Arch Linux
    • Android
    • Android Tablet
    • Fedora
    • F-Droid

    • India

    

    

    

    More about Episteme Reader  

    

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15. 

    

    Calibre-Web

     37 likes

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

    101 Calibre-Web alternatives

    Cost / License

    • Free
    • Open Source (GPL-3.0)

    Application typeApplication types

    • Ebook Reader
    • Ebook Library

    Origin

    • Germany
    • EU

    Since

    • Since 2017

    Platforms

    • Self-Hosted
    • Cloudron

    • Germany
    • EU

    

    More about Calibre-Web  

    

    Good alternative?Is Calibre-Web a good alternative to calibre?