# Calibre Sync vs Gymaster

The clearest difference is price: Gymaster at Free against Calibre Sync's $4.99. Gymaster also leads on iOS requirement (12.0 vs 15.0). Calibre Sync's advantage is update cadence (weekly vs every 7 months). On ads, in-app purchases and device support there is nothing between them.

Gymaster 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, Gymaster every 7 months. The most recent releases landed on October 18, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Calibre Sync | Gymaster |
| --- | --- | --- |
| 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 | No |
| Update frequency | **Weekly** | Every 7 months |
| Monetization | Paid | — |
| Size | 128 MB | 85 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [DUONG THUY PHAM](https://appshunter.io/developer/1795008858) | [坦 张](https://appshunter.io/developer/1735517971) |

## 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


### Gymaster

[App page](https://appshunter.io/ios/app/gymaster/id6479428115)

**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 Gymaster free?

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

### Do Calibre Sync or Gymaster have ads?

Neither Calibre Sync nor Gymaster shows ads.

### Which is updated more often, Calibre Sync or Gymaster?

Calibre Sync ships an update weekly, and Gymaster every 7 months. Most recently, Calibre Sync was updated on October 18, 2026 and Gymaster on October 3, 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.*