Alternatives to Calibre
The ebook library Swiss-army knife
Calibre ranks #1 of 8 in Ebook readers, with an Alt Score of 90. It is licensed under GPL-3.0, free from Free and available on Windows, macOS, Linux, iOS and Android. 9 of 9 checklist rows are verified against a public source.
Readers with large personal e-book collections who want a single desktop application to organize, convert, and manage titles across multiple formats and devices.
A library manager that catalogs e-books with searchable metadata (covers, tags, series, ratings), converts between formats like EPUB, MOBI, PDF, and AZW3, and includes a built-in e-book viewer and editor for tweaking content and metadata. It can also fetch news from websites and convert it into e-book form for offline reading. Calibre is free, open-source, and available for Windows, macOS, and Linux.
You add e-books to your calibre library, where it automatically extracts and lets you edit metadata; from there you convert files to the format your device needs and connect an e-reader via USB or Wi-Fi to sync the library directly to it.
Where Calibre stands out
Verified capabilities most alternatives don't have.
Why people leave Calibre
Dashed reasons are sourced facts; the rest are opinions. Vendors can dispute.
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Ranked alternatives
Ordered by Alt Score. Click any score to see the breakdown.
Feature comparison
How Calibre compares with its alternatives, feature by feature.
| Ebook readers checklist | Calibre | Moon+ Reader | KOReader | Librera | Apple Books | Google Play Books |
|---|---|---|---|---|---|---|
| Pricing model | ||||||
| Starts at | ||||||
| License | ||||||
| Platforms | ||||||
| Formats (EPUB, PDF, MOBI, CBZ) | ||||||
| Sync position across devices | ||||||
| Annotation & highlights export | ||||||
| Dictionaries | ||||||
| OPDS support | ||||||
| Text-to-speech | ||||||
| Page turn customization | ||||||
| Library management | ||||||
| DRM support |
Every fact and feature listed for Calibre is verified against its own pages. Each alternative is sourced on its own page.
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Starts at Free verified 2026-07-10
It's also completely free and open source and great for both casual users and computer experts.
https://calibre-ebook.com/about -
License GPL-3.0 verified 2026-07-10
GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007
https://raw.githubusercontent.com/kovidgoyal/calibre/master/LICENSE -
Pricing model Free verified 2026-07-10
It's also completely free and open source and great for both casual users and computer experts.
https://calibre-ebook.com/about -
Platforms Windows, macOS, Linux, iOS, Android verified 2026-07-10
Windows, macOS, Linux, Portable, Android, Apple iOS
https://calibre-ebook.com/download -
Status active verified 2026-07-10
9.11, released on 02 Jul, 2026
https://calibre-ebook.com/whats-new -
Formats (EPUB, PDF, MOBI, CBZ) Yes verified 2026-07-10
AZW, AZW3, AZW4, CBZ, CBR, CB7, CBC, CHM, DJVU, DOCX, EPUB, FB2, FBZ, HTML, HTMLZ, KEPUB, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, SNB, TCR, TXT, TXTZ
https://manual.calibre-ebook.com/faq.html -
Sync position across devices Yes verified 2026-07-10
If you leave the Content server running, you can even open the same book on multiple devices and it will remember your last read position.
https://manual.calibre-ebook.com/server.html -
Annotation & highlights export Yes verified 2026-07-10
You can click the highlight button in that bar to create a highlight. You can add notes and change the color of the highlight.
https://manual.calibre-ebook.com/viewer.html -
Dictionaries Yes verified 2026-07-10
You can look up the meaning of words in the current book by double clicking or long tapping the word you want to lookup and then clicking the lookup button that looks like a library.
https://manual.calibre-ebook.com/viewer.html -
OPDS support Yes verified 2026-07-10
Advertise the OPDS feeds via the BonJour service, so that OPDS based reading apps can detect and connect to the server automatically.
https://manual.calibre-ebook.com/generated/en/calibre-server.html -
Text-to-speech Yes verified 2026-07-10
The viewer can read book text aloud. To use it you can simply click the Read aloud button in the viewer controls to start reading book text aloud.
https://manual.calibre-ebook.com/viewer.html -
Page turn customization Yes verified 2026-07-10
You can change the number of pages displayed on the screen as well as page margins in Page layout in the viewer preferences.
https://manual.calibre-ebook.com/viewer.html -
Library management Yes verified 2026-07-10
calibre allows you to create as many libraries as you wish
https://manual.calibre-ebook.com/faq.html -
DRM support No verified 2026-07-10
Most purchased EPUB books have DRM. This prevents calibre from opening them.
https://manual.calibre-ebook.com/faq.html
FAQ
Yes. Moon+ Reader, KOReader and Librera have a free tier or are fully free. Free-tier limits in the comparison table are verified and dated.
KOReader and Librera — every license claim links its source.