Access and manage your Calibre ebook libraries from various cloud services or wirelessly connect to your desktop. Browse, search, download, and organize your books on your device. Supports multiple libraries and accounts.






177+ iOS apps curated and reviewed
Out of 177+ calibre sync apps on iOS, 19 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 | $4.99 | 3.9★ (54) | No | No | Jul 2026 | |
| 2 | Free | 2.4★ (13) | No | No | Jun 2026 | |
| 3 | Free | 3.1★ (305) | No | Yes | Jun 2026 | |
| 4 | Free | 4.5★ (146) | No | Yes | Jul 2026 | |
| 5 | Free | 4.9★ (5.7M) | Yes | No | Jul 2026 | |
| 6 | Free | 4.5★ (844) | Yes | No | Jul 2026 | |
| 7 | Free | 4.2★ (15K) | No | Yes | Jul 2026 | |
| 8 | Free | 4.5★ (853) | Yes | Yes | Jul 2026 |






Access and manage your Calibre ebook libraries from various cloud services or wirelessly connect to your desktop. Browse, search, download, and organize your books on your device. Supports multiple libraries and accounts.

This application facilitates the transfer of book information from the Calibre software to your Apple device. It enables easy access to your digital library on the go.





This app organizes your ebook library on your device, emulates a device for WiFi connections to your main library, and acts as a content server client for cloud storage. It allows you to view book metadata, sort and group books, mark them as read, and launch your preferred reader app.


This app is a powerful ebook reader designed for deep thinkers and researchers. It offers advanced annotation tools, seamless device syncing, and robust library management with OPDS and Calibre support. Enjoy a distraction-free reading experience with customizable modes and multi-book viewing for enhanced study and analysis.


Access a vast library of eBooks, magazines, and comics on your mobile device. Customize your reading experience with adjustable text, brightness, and page-turning options. Look up words, track progress, and sync across devices.


Securely transfer files and back up photos between your devices without using third-party servers. Enjoy unlimited storage and speed, with direct peer-to-peer transfers for privacy and efficiency. Supports all file types across various platforms.


Seamlessly sync your Fitbit data to Apple Health for free. Track heart rate, steps, distance, weight, sleep, and more. Supports all Fitbit devices and multiple accounts, with an optional auto-sync feature for convenience.


This app helps synchronize radio-controlled watches by simulating time signal waves. It supports various international time signal standards and offers a 'Beast Mode' for faster synchronization. Simply place your watch near your device's speaker and start the process.


This app automatically transfers your health and fitness data from your Fitbit account to the Apple Health app. It supports syncing over 24 different health metrics, creating a centralized hub for all your wellness information without manual entry.


Seamlessly transfer your complete Fitbit history to Apple Health. This app prioritizes your data privacy by not viewing or storing any synced fitness information. It securely syncs a wide range of data types, including steps, workouts, weight, and sleep analysis.


Listen to audiobooks with this app, featuring a vast library of novels, business books, and educational content. Enjoy hands-free reading during commutes or while doing chores. An optional subscription offers unlimited access to thousands of titles.


This app allows you to export your entire Fitbit history to Apple Health, including detailed metrics like steps, weight, workouts, and sleep stages. It offers automatic background syncing and preserves your existing Apple Health data.


Manage your contacts, calendar, tasks, and notes in one app. Syncs seamlessly with popular PC CRMs like Outlook, Act!, and GoldMine, offering direct USB, Wi-Fi, and cloud synchronization options. Features persistent alarms, custom fields, and multiple task management styles.


Seamlessly transfer your health and fitness data between various popular apps and devices. This tool automates background syncing, ensuring your information is up-to-date across your chosen platforms. Enjoy a week-long free trial to explore its capabilities before a one-time purchase unlocks full historical data syncing.


Seamlessly synchronize your Microsoft Outlook data, including emails, calendars, and contacts, with Google, iCloud, and other cloud services. This companion app enables two-way syncing between your PC and mobile devices like iPhone and iPad, even when Outlook is closed.


Synchronize files between your iOS devices and other Syncthing-supported platforms without relying on cloud storage. Manage multiple folders and remote devices, with options for sandbox or experimental cross-app sandbox syncing.


Securely back up and sync files, photos, and music across all your devices. Protect your digital life with advanced encryption and easily share or restore files. Offers automatic syncing and remote data wiping for enhanced security and convenience.


Securely back up and sync your mobile data with private key encryption for maximum security. Access your files from anywhere, on any device, and share them easily. Protect photos and videos automatically as they are taken.


Seamlessly transfer your fitness data from Fitbit to Apple Health. This app automatically syncs your daily steps, calories, sleep, and more in the background. Enjoy a unified view of your health metrics across platforms.


Effortlessly synchronize your contacts across Google, Outlook, and iPhone. This reliable app ensures your contact information is up-to-date everywhere with 2-way syncing and support for all contact fields and photos.