Online calibre Alternatives

calibre is not available as a web app but there are plenty of alternatives that runs in the browser with similar functionality. The best Online alternative is Google Play Books, which is free. If that doesn't suit you, our users have ranked more than 100 alternatives to calibre and many of them are available as a web app so hopefully you can find a suitable replacement. Other interesting Online alternatives to calibre are Koodo Reader, Readest, Flow and BookFusion.

filter to find the best alternatives

calibre alternatives are mainly Ebook Readers, but if you're looking for Ebook Libraries or Text to Speech Services you can filter on that. These are just examples - use the filter bar below to find more specific alternatives to calibre.
calibre iconcalibre
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Free e-book manager offering library management, multi-format conversion, syncing to devices, news download as e-books, built-in viewer, editor, and privacy.

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More about calibre
calibre alternatives page was last updated May 17, 2025
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  1. Google Play Books icon

    Google Play Books

     151 likes
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    Discover a vast library of books to search, preview, and buy, read free public domain books, sync page positions, and back up purchases online for a seamless reading experience across multiple devices.

    63 Google Play Books alternatives

    License model

    • Freemium • Proprietary

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Online
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Android Auto
    Google Play Books screenshot 1

    Google Play Books Features

    1.  Built-in Dictionary
    2.  Catalog
    3.  Book search
    4.  Built-in translation

    Google Play Books VS calibre

     
    Comments about Google Play Books as an Alternative to calibre
    Top Positive Comment
    Aiko
    Oct 16, 2022
    -1

    Other than being an e-book store, it also allows PDF and EPUB files to be uploaded and they become available on all devices with Google Play Books. The reader is pretty great as well.

    Top Negative Comment
    liberation
    Sep 26, 2024
    1

    google play books is nowhere near the same as calibre

    Most Recent Comment
    Guest
    Negative Sep 23, 2022
    1

    Google Play books isn't an ePub reader. You need to buy books to use it.

    Show more comments
    3 of 8 comments
    calibre Icon
    Google Play Books icon

    • This alternative is disputed. Google Play Books is a legitimate calibre alternative, but it might have issues that some users think are important.

    • Google Play Books is the most popular Web-based, iPhone & iPad alternative to calibre.

    • Google Play Books is Freemium and Proprietarycalibre is Free and Open Source
  2. Koodo Reader icon

    Koodo Reader

     40 likes
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    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.

    27 Koodo Reader alternatives

    License model

    • Free • Open Source

    Application types

    Platforms

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

    Properties

    1.  Privacy focused
    2.  Customizable

    Features

    1.  Dark Mode
    2.  Works Offline
    3.  Ad-free
    4.  PDF annotation
    5.  No registration required
    6.  Full-Text Search
    7.  Cloud Sync
    8.  Text to Speech
    9.  Web-Based

    Koodo Reader VS calibre

     
    Comments about Koodo Reader as an Alternative to calibre
    alexanderprange
    Positive Sep 10, 2022
    1

    cleaner and significantly better user interface and user friendly.

    RemovedUser
    Positive Dec 23, 2021
    0

    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.

    calibre Icon
    Koodo Reader icon

    • Most users think Koodo Reader is a great calibre alternative.

    • Koodo Reader is the most popular Windows & Mac alternative to calibre.

    • Koodo Reader is Free and Open Sourcecalibre is also Free and Open Source
    • Koodo Reader is Customizable and Privacy focusedcalibre is not according to our users
  4. Readest icon

    Readest

     9 likes
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    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.

    11 Readest alternatives

    License model

    • Free • Open Source

    Application type

    Country of Origin

    • US flagUnited States

    Platforms

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

    Properties

    1.  Lightweight
    2.  Support for Themes
    3.  Privacy focused

    Features

    1.  Cloud Sync
    2.  Portable
    3.  Ad-free
    4.  Built-in viewer
    5.  Full-Text Search
    6.  Works Offline
    7.  Dark Mode
    8.  No registration required

    Readest VS calibre

     
  5. Flow icon

    Flow

     4 likes
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    Flow is an online EPUB reader that offers its services at no cost and is compatible across a range of platforms including Web, Windows, Linux, macOS, Android, and iOS. It provides the convenience of reading multiple books simultaneously and enables seamless reading across...

    55 Flow alternatives

    License model

    • Free • Open Source

    Application type

    Platforms

    • Online
    Flow screenshot 1

    Properties

    1.  Privacy focused
    2.  Lightweight
    3.  Support for Themes

    Features

    1.  Dark Mode
    2.  No Tracking
    3.  Ad-free
    4.  No registration required

    Flow VS calibre

     
  6. BookFusion icon

    BookFusion

     13 likes
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    eBook platform focused on openness that provides e-book library management and reader for users to upload & read their e-books across all devices while also allowing businesses and schools to create their own digital library to distribute content.

    60 BookFusion alternatives

    License model

    • Freemium • Proprietary

    Application types

    Country of Origin

    • JM flagJamaica

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    BookFusion screenshot 1

    Properties

    1.  Educational

    Features

    1.  Cloud Sync
    2.  Ebook Conversion
    3. Docker icon  Support for Docker
    4.  E-book management

    BookFusion VS calibre

     
  7. MyBookshelf icon

    MyBookshelf

     4 likes
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    MyBookshelf is web based program to manage your library of ebooks. It is fully web based, with simple, yet powerful interface. It’s written in python language and django web framework offers great flexibility and extensibility. Ideal for sharing ebooks within a group of people.

    7 MyBookshelf alternatives

    License model

    • Free • Open Source

    Application type

    Platforms

    • Linux
    • Online
    MyBookshelf screenshot 1

    MyBookshelf VS calibre

     
  9. Libreture icon

    Libreture

     3 likes
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    Store your ebooks. Track your reading. Discover new favourites.

    Goodreads meets Dropbox - your own ebook cloud library for all your digital reading.

    License model

    • Freemium • Proprietary

    Application types

    Country of Origin

    • GB flagUnited Kingdom

    Platforms

    • Online
    • EPUBReader
    • Cool Reader
    • Aldiko
    • Moon+ Reader
    • Stanza
    • FBReader
    Homepage

    Properties

    1.  Privacy focused

    Features

    1.  DRM Free
    2.  Ad-free
    3.  No Tracking
    4.  OPDS Server
    5.  E-book management
    6.  File Storage

    Libreture VS calibre

     
  10. illuminsight icon

    illuminsight

     1 like
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    💡 illuminsight 👀 effortlessly generates insights for selected text within your EPUB-format books, showing you relevant, contextualized data at a glance.

    License model

    • Free • Open Source

    Application type

    Country of Origin

    • US flagUnited States

    Platforms

    • Online
    • Android
    • Android Tablet
    illuminsight screenshot 1
    illuminsight screenshot 2
    illuminsight screenshot 3
    Discontinued

    The app has not been updated since 2019. The app's official website redirects you to another website not related to the app.

    Properties

    1.  Educational

    Features

    1.  Wiki

    illuminsight VS calibre

     
  11. ISBN Lookup icon

    ISBN Lookup

     1 like
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    Discover comprehensive book information with just an ISBN number. Get covers, descriptions, and AI-powered overviews for any book.

    License model

    • Free • Proprietary

    Platforms

    • Online
    Homepage

    Properties

    1.  Privacy focused
    2.  Lightweight

    Features

    1.  Ad-free
    2.  No registration required

    ISBN Lookup VS calibre

     
9 of 20 calibre alternatives