Unlimited Calibre libraries across multiple accounts for flexible organization.
Wireless device emulation enables seamless access to Calibre libraries.
Cross-library search, statistics, and fast updates improve discovery and management.
Not a dedicated reader app; requires a separate e-book reader to open titles.
Only Microsoft OneDrive Personal accounts are supported; Box API caveats apply.
Complex setup for case-sensitive file systems and specific cloud configurations.
About Calibre Sync
Calibre Sync is a books & reference app developed by BIL studio.
How many times has Calibre Sync been downloaded?
Calibre Sync has been downloaded 14 thousand times. In the last 30 days, the app was downloaded 210 times. It is ranked #10 in books & reference.
What is the rating of Calibre Sync?
Calibre Sync is rated 3.55 out of 5 stars, based on 340 ratings.
Is Calibre Sync free?
Calibre Sync costs $5.49 to download. The APK download size is 45.50 MB. The latest version available is 6.10.4. The last update was on July 21, 2026.
What are the requirements for Calibre Sync?
Calibre Sync requires Android 4.4+ or higher. The app has a content rating of Everyone. The app has been available on Google Play April 2020.
Description
Lifetime support, no extra charge, no subscription fee.
Calibre Sync can: - help you access full Calibre libraries on most popular personal cloud services, including Google Drive, Dropbox, Microsoft OneDrive, Box, pCloud, MEGA, WebDav, Nextcloud, OwnCloud, TeraBox and Proton Drive - simply the most supported for cloud services. - transform your device to a smart device emulator that connects to Calibre wirelessly. It even supports Calibre libraries on your external storage and from Calibre Content Server with amazing performance.
Move your Calibre libraries to your favourite cloud providers and access those libraries via Calibre Sync to browse, sort, search, download and read books on your device. Calibre Sync also supports multiple libraries across multiple Drive, Dropbox, OneDrive, Box, pCloud, MEGA, WebDav, Nextcloud, OwnCloud, TeraBox and Proton Drive accounts simultaneously.
Features: - Unlimited Calibre libraries - Wireless connect to Calibre effortlessly as Smart device - Easy switch between multiple libraries across multiple accounts - Automatic check and update libraries when launching the app - Pull, Refresh or Remove a library from Calibre Sync - Support different book list layouts: List - detailed and simple, Grid, and Carousel - View your library statistics - Search across all of your available libraries - Search books by title, authors, and even in comments and custom columns - Filter books on authors, series, tags, language, publishers, formats and in custom columns - Sort libraries by title, author, ratings, and several Date options - ascending and descending - Filter downloaded books - Configuration for each library download location - Support for custom columns in book details view - Quick access to book download and share via slideable list view - Zoom the book cover - Support "swipe from book to book" in book details view - Email or share a copy of downloaded book - Open downloaded book in your book reader application to read a book - View the file size of each book format - Show book identifiers and link to source (like ISBN, Amazon, Google Books, Goodreads, etc) - Dark/light themes - And many more features ...
To move your Calibre library to cloud services: 1) Open Calibre on your Laptop/PC/Desktop 2) Select "Switch/create library..." from the Calibre menu 3) Select an empty folder on your Cloud drive in "New Location" drop down 4) Select "Move current library to new location", then press OK 5) Wait for cloud sync to complete. 6) Then you are ready to use Calibre Sync.
To move your Calibre library to your phone storage, just copy the library directory to your phone storage.
Notes: - Calibre Sync is not a reader app. You must install and use one of the many excellent reader apps available. - Only Microsoft OneDrive for Personal accounts (shared) are supported. Please email us if you observe any inconsistencies. - Due to restriction in Box API, Calibre Sync must acquire write permission in order to download files, download is not a read action on Box. Calibre Sync guarantees that it will not perform any write actions against your data in Box cloud account. - Calibre Sync use WebDav API of Nextcloud and OwnCloud services, and it requires case sensitive file system to work properly. Therefore, you must make sure that your libraries are set up on case sensitive file system (Linux, recent MacOS, Windows NTFS with case sensitive enabled).
Please leave your reviews and suggestions to help us improve the app. For more information see https://calibresync.bitbucket.io
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The interface is maybe not the most intuitive, but the app is exactly what I was looking for and works well. Thanks.
★★★★★Jennifer McGaffey· Apr 29, 2026
I used Caliber Companion for years, and was sorry to see it go. But I actually find Caliber Sync suits me better (except I wish I could sync back reading dates - you can, but only to caliber Content Server libraries). It's been working well for me for quite a while, then caliber changed their database and CS wouldn't work with the latest version. I am delighted to see the last couple updates - fixed that problem, but also glad to see fixes in general (not abandoned). Thanks!
★★★★★Austin Poorbaugh· Aug 23, 2024
Incredibly powerful app and just what I was looking for! The developer is actively working to make this app better with each release and incorporates any of the suggestions and requests into new versions. I emailed requesting some support, and they replied within two days. Awesome! I have 1400+ books in my library and use the Caliber server option. Quick to search and find books that I want to put on my device. For those wanting sync-read-position -> moon+ reader is it.
★☆☆☆☆Mike Klodnicki· Feb 12, 2025
Developer is no longer responsive. UI is a nightmare. It was worth a shot, but there's just not a proper offline caliber library browser app out there.
★☆☆☆☆James Herman· Mar 30, 2026
Caliber v9.0 changed its db and as a consequence, Caliber Sync now fails to update. Last update to Caliber Sync was 1 APR 2025. I have not been able to Sync since at least early January 2026, coinciding with Caliber's v9.0 upgrade. Specifically, Caliber Sync on OneDrive generates a "metadata true failed to load library info" error on sync. Gemini indicates the problem is widespread and due to major change in the Caliber db with v9.0. Ostensibly, introduced to improve performance.
★☆☆☆☆Leshawn Jackson· Apr 19, 2026
Do not pay for this app! The Caliber sync doesn't work and when I use one drive you can't even open the books on it, you need another reader.
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