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 Librera Reader, Foliate, 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.

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calibre

1308

Free • Open Source
Ebook Reader

Mac
Windows
Linux
Homebrew
PortableApps.com
Flathub
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

MuPDF
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Yes
No
Free • Open Source
PDF Reader
Windows
Linux
Android
iPhone
iPad
F-Droid
Xfce
78 alternatives to MuPDF
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.
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MuPDF Features
1. LightweightMuPDF consumes less device resources compared to similar apps.
2. PortableMuPDF can be used from a USB stick or similar with no prior installation.
3. PDF annotationMuPDF support PDF Annotation for highlighting, notes etc
4. Ad-freeMuPDF doesn't contain any form of external advertising.
Vim key mapping
MuPDF vs calibre opinions
pros, cons and recent comments
bluMyst
MuPDF runs blazing fast. It was made for power users and is probably not going to be intuitive to people who don't use vim. You can view a list of keybinds with F1.

Sadly it doesn't have a table of contents on the side like calibre does, and this is a dealbreaker for me..
Negative comment•
0

Guest
Calibre is an e-book manager, a library and a reader. It supports a bunch of formats and can convert to/from several formats. Calibre can create/use multiple separate libraries of e-buuks. MuPDF is just a PDF viewer.
Negative comment•
0
Librera Reader
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Yes
No
Freemium • Open Source
Ebook Reader
PDF Reader
Ebook Library
Android
Android Tablet
F-Droid
39 alternatives to Librera Reader
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.
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Librera Reader Features
1. Ad-freeLibrera Reader doesn't contain any form of external advertising.
2. Text to SpeechLibrera Reader allows you to transform written text into spoken text.
3. LightweightLibrera Reader consumes less device resources compared to similar apps.
4. Dark ModeLibrera Reader supports dark mode for comfortable usage in low light conditions.
5. Privacy focusedLibrera Reader is considered a privacy friendly alternative.
6. Full-Text SearchLibrera Reader lets you search for specific words or phrases from inside a document or database.
7. Works OfflineLibrera Reader can be used without the need to connect to the internet.
Customizable
Auto Scrolling
OPDS Client
Built-in File Manager
Blue light filter
Foliate
Do you think this is a good alternative?
Yes
No
Free • Open Source
Ebook Reader
Ebook Library
Text to Speech Service
Linux
FLATHUB
Snapcraft
BSD
38 alternatives to Foliate
A simple and modern eBook viewer for Linux desktops.
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Foliate Features
1. Dark ModeFoliate supports dark mode for comfortable usage in low light conditions.
2. Built-in DictionaryFoliate has a built-in dictionary where you can look up broader definitions of words.
3. Ad-freeFoliate doesn't contain any form of external advertising.
4. Support for ThemesYou can use themes and templates to change the look and feel of Foliate.
5. Works OfflineFoliate can be used without the need to connect to the internet.
6. Full-Text SearchFoliate lets you search for specific words or phrases from inside a document or database.
7. No registration requiredYou can use most of the features in Foliate without registration.
8. Text to SpeechFoliate allows you to transform written text into spoken text.
Text Highlighting
Text annotation
Export annotations
Plain text flows
Flipping pages
Multiple languages
Foliate vs calibre opinions
Document Viewer
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Yes
No
Free • Open Source
PDF Reader
Ebook Reader
Android
Android Tablet
F-Droid
134 alternatives to Document Viewer
Document Viewer is a highly customizable document viewer for Android, fork of the last GPL version of EBookDroid .
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Document Viewer Features
Customizable
Discontinued
The last version (2.7.4) was released in March 2016.

Document Viewer vs calibre opinions
Some users think Document Viewer is a great alternative to calibre, some don't.
Cool Reader
Do you think this is a good alternative?
Yes
No
Free • Open Source
Ebook Reader
Ebook Library
Linux
Android
Android Tablet
80 alternatives to Cool Reader
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...
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Cool Reader Features
1. PortableCool Reader can be used from a USB stick or similar with no prior installation.
Interface Overlay
Library Management
Cool Reader vs calibre opinions
Some users think Cool Reader is a great alternative to calibre, some don't.
Guest
Not management system, only reader.
Negative comment•
8
Koodo Reader
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Yes
No
Free • Open Source
Ebook Reader
PDF Reader
Mac
Windows
Linux
Online
Flathub
9 alternatives to Koodo Reader
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.
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Koodo Reader Features
1. Dark ModeKoodo Reader supports dark mode for comfortable usage in low light conditions.
2. PDF annotationKoodo Reader support PDF Annotation for highlighting, notes etc
3. Works OfflineKoodo Reader can be used without the need to connect to the internet.
4. No registration requiredYou can use most of the features in Koodo Reader without registration.
5. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
6. Privacy focusedKoodo Reader is considered a privacy friendly alternative.
7. Ad-freeKoodo Reader doesn't contain any form of external advertising.
FOSS
Customizable
Web-Based
Koodo Reader vs calibre opinions
pros, cons and recent comments
alexanderprange
cleaner and significantly better user interface and user friendly.
Positive comment•
0

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•
0
KOReader
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Yes
No
Free • Open Source
Ebook Reader
PDF Reader
Linux
Android
Kobo
PocketBook Reader
F-Droid
Kindle Fire
Flathub
AppImageHub
34 alternatives to KOReader
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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KOReader Features
1. Built-in DictionaryKOReader has a built-in dictionary where you can look up broader definitions of words.
2. Ad-freeKOReader doesn't contain any form of external advertising.
3. Dark ModeKOReader supports dark mode for comfortable usage in low light conditions.
Wallabag integration
Wikipedia integration
Calibre Web
Do you think this is a good alternative?
Yes
No
Free • Open Source
Ebook Reader
Ebook Library
PDF Reader
Self-Hosted
70 alternatives to Calibre Web
Calibre Web is a web app providing a clean interface for browsing, reading and downloading eBooks using an existing Calibre database.
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Calibre Web Features
OPDS Server
Built-in e-Book converter
Kavita
Do you think this is a good alternative?
Yes
No
Free • Open Source
Ebook Reader
Ebook Library
PDF Reader
Mac
Windows
Linux
Self-Hosted
149 alternatives to Kavita
Lighting fast with a slick design, Kavita is a rocket fueled self-hosted digital library which supports a vast array of file formats. Install to start reading and share your server with your friends. book reader, self hosted, manga, comics, free, manhwa, e readers, electronic...
Suggest and vote on features
Kavita Features
1. Dark ModeKavita supports dark mode for comfortable usage in low light conditions.
2. LightweightKavita consumes less device resources compared to similar apps.
Web-Based
Offline Reading
Bookworm
Do you think this is a good alternative?
Yes
No
Free • Open Source
Ebook Reader
Linux
19 alternatives to Bookworm
Read the books you love without having to worry about different format complexities like epub, pdf, mobi, cbr, etc.

Bookworm has no features, suggest some!

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•
0

Guest
Focused on reading, not library management. Can't convert between formats.
Negative comment•
3