46
BU Score
Emerging
Calibre Sync
✍️ BU Analytics Review
“
Calibre Sync is an iOS app from DUONG THUY PHAM in the Utilities category, currently rated 3.7★ across 50 ratings. Initial signal reads as mixed reviews — supporters praise core features while critics cite stability/value gaps.
Our BU Score puts it at 46 — Emerging (early traction worth watching). For a Utilities app, that means early traction worth watching.
Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.
creator
📊 Performance Tracking LIVE
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Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
Range:
💰 Forecast Revenue / mo
MODELRevenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 4 of 4 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Paid app ($0.00)METRIC | +$2,800 | |
| Established app (4y old)METRIC | +$800 | |
| Single-language (English only)METRIC | −$400 | |
| Pre-traction phase (50 ratings)METRIC | −$300 |
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)
📈 Reviews Growth
LIVECumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
Jul 24
Oct 24
Mar 25
Nov 25
Feb 26
Mar 26
⭐ Rating Trend
LIVEAverage rating evolution. Updates with each new review batch.
🗓️ Snapshot Timeline
HISTORYEach bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →💾 97 MB🔞 4+📱 iOS 10.0+🔖 v6.8.5🔄 updated 1d ago🌐 EN📂 Utilities💰 Paid🚀 Launched 2022 (4y old)
📝 About this app
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, iCloud, WebDav, Nextcloud, OwnCloud, and TeraBox - 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 or Calibre-web 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, iCloud, WebDav, Nextcloud, OwnCloud, and TeraBox 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
- Send books to Kindle with ease
- 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
Calibre is © Kovid Goyal - calibre-ebook.com
Drive is © Google LLC.
Dropbox is © Dropbox inc.
OneDrive is © Microsoft
Box is © Box inc.
pCloud is © pCloud AG
Nextcloud is © Nextcloud GmbH
OwnCloud is © OwnCloud
MEGA is © MEGA
iCloud is © Apple Inc
TeraBox © Flextech Inc
Calibre Sync can:
- help you access full Calibre libraries on most popular personal cloud services, including Google Drive, Dropbox, Microsoft OneDrive, Box, pCloud, MEGA, iCloud, WebDav, Nextcloud, OwnCloud, and TeraBox - 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 or Calibre-web 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, iCloud, WebDav, Nextcloud, OwnCloud, and TeraBox 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
- Send books to Kindle with ease
- 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
Calibre is © Kovid Goyal - calibre-ebook.com
Drive is © Google LLC.
Dropbox is © Dropbox inc.
OneDrive is © Microsoft
Box is © Box inc.
pCloud is © pCloud AG
Nextcloud is © Nextcloud GmbH
OwnCloud is © OwnCloud
MEGA is © MEGA
iCloud is © Apple Inc
TeraBox © Flextech Inc
🆕 What's New · v6.8.5
- Fix issue with loading libraries from local storage
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Calibre Sync
- Developer
- DUONG THUY PHAM
- Bundle ID
- com.trucnguyen.calibresync
- App Store URL
- Open in App Store
- Category
- Utilities
- Content rating
- 4+
- Languages
- EN
Company
- Website
- Not found
- Tagline
- Today
- Description
- Find apps and games for iPhone, iPad, Mac, and more on the App Store.
- Founded
- Not found
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- OG image
Revenue
- Verified revenue / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- ML model estimate / mo
- $287/mo
- Top-grossing rank
- Outside top 100 in US Utilities
- All-time revenue
- Not found
- Pricing
- Not found
Founder
- Name
- Not found
- X / Twitter
- Not found
- Not found
- GitHub
- Not found
- X followers
- Not found
- Public statements
- Not found
Funding
- Total raised
- Not found
- Last round
- Not found
- Investors
- Not found
- Crunchbase
- Not found
- AngelList
- Not found
Press & Links
- Articles found
- Not found
- Listed on
- Not found
- Blog
- https://apps.apple.com/us/app/letterloop-group-newsletters/id6468623700
- Press / News
- Not found
Contacts & Socials
- Socials
- Not found
- Not found
- Phone
- Not found
- Contact page
- Not found
- About page
- https://apps.apple.com/us/iphone/story/id1860412460
📈Ratings growth50 ratings+4900% lifetimeShow 3-year history estimate ▾
Tracked (24 weeks) Pre-tracking estimate (36 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
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