# Calibre Sync vs FSI CONNECT

The clearest difference is price: FSI CONNECT at Free against Calibre Sync's $4.99. Calibre Sync's advantage is ads (none vs shown) and update cadence (weekly vs every 3 months). On in-app purchases, device support and iOS requirement there is nothing between them.

FSI CONNECT is free to download; Calibre Sync costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Calibre Sync ships an update weekly, FSI CONNECT every 3 months. The most recent releases landed on October 18, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Calibre Sync | FSI CONNECT |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[3.9 (55 ratings)](https://appshunter.io/ios/app/calibre-sync/id1609138078/reviews)** | — |
| Number of ratings | **55** | — |
| Positive reviews | 62.1% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 3 months |
| Monetization | Paid | — |
| Size | 128 MB | 80 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [DUONG THUY PHAM](https://appshunter.io/developer/1795008858) | [Pure SAS](https://appshunter.io/developer/1818481908) |

## What reviewers say

### Calibre Sync

[App page](https://appshunter.io/ios/app/calibre-sync/id1609138078)

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.

**Highlights:** Access Calibre libraries on cloud services, Wireless connection to Calibre, Supports multiple libraries and accounts, Browse, search, and download books, Organize books with filters and sorting, Send books to Kindle

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Access Calibre library anywhere
- 🚀 Syncs easily and quickly
- 💡 Mirrors Calibre library design
- 💡 Viewable and searchable library
- 💡 Downloadable on demand

**What reviewers complain about**

- 🐛 Popup cannot be removed
- 🐛 Sync issues with Calibre v9
- 🐛 Developer non-responsive
- 🐛 App broken since Calibre v9
- 🐛 Deprecated database columns

**Reported bugs**

- Popup reappears every launch
- Calibre version 9 bricked the app
- Database error
- Stopped working since Calibre update
- Error when changing DB

**Requested features**

- More customizability with viewing options
- Integrated ebook reader
- Mark books as favorites
- Calendar feature for reading
- Use configured mail app


### FSI CONNECT

[App page](https://appshunter.io/ios/app/fsi-connect/id6746774977)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calibre Sync free?

Calibre Sync costs $4.99, with no in-app purchases.

### Is FSI CONNECT free?

FSI CONNECT is free to download, with no in-app purchases.

### Do Calibre Sync or FSI CONNECT have ads?

FSI CONNECT shows ads; Calibre Sync does not.

### Which is updated more often, Calibre Sync or FSI CONNECT?

Calibre Sync ships an update weekly, and FSI CONNECT every 3 months. Most recently, Calibre Sync was updated on October 18, 2026 and FSI CONNECT on September 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*