# Calibre Sync vs Quartermaster

The clearest difference is price: Quartermaster at Free against Calibre Sync's $4.99. Quartermaster also leads on rating (5.0 vs 3.9) and review sentiment (93% vs 62%). Calibre Sync's advantage is in-app purchases (none vs 6) and update cadence (weekly vs every 2 weeks). On ratings volume, ads, device support and iOS requirement there is nothing between them.

Quartermaster is free to download; Calibre Sync costs $4.99 up front. Quartermaster sells 5 in-app purchases, starting at $4.99 per month. Calibre Sync asks for nothing beyond the download.

Quartermaster holds the better App Store score, 5.0 against 3.9. Both are backed by a comparable volume of ratings — 55 and 42 respectively. Written reviews point the same way: 62% of Calibre Sync's written reviews are positive against 93% of Quartermaster's.

Calibre Sync ships an update weekly, Quartermaster every 2 weeks. Both last shipped on October 13, 2026.

## The numbers

| Metric | Calibre Sync | Quartermaster |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [3.9 (55 ratings)](https://appshunter.io/ios/app/calibre-sync/id1609138078/reviews) | **[5.0 (42 ratings)](https://appshunter.io/ios/app/quartermaster-homelab-stack/id6779994284/reviews)** |
| Number of ratings | **55** | 42 |
| Positive reviews | 62.1% of reviews | **92.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#169** | — |
| Size | 128 MB | 106 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DUONG THUY PHAM](https://appshunter.io/developer/1795008858) | [Lewis Egley](https://appshunter.io/developer/6779994286) |

## What reviewers say

### Calibre Sync

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

**Currently charting:** #169 Top Paid · Utilities (US App Store)

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


### Quartermaster

[App page](https://appshunter.io/ios/app/quartermaster-homelab-stack/id6779994284)

Manage your self-hosted media and home infrastructure from a single, native iOS application. Browse, request, and monitor your entertainment stack, alongside servers, containers, and smart home devices. Offers a private, direct connection to your services without any cloud intermediaries.

**Highlights:** Unified media management, Server and container monitoring, Automated network switching, Diagnostic tools, Customizable interface, Private notifications

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Quartermaster Pro (Monthly) | $4.99 | per month |
| Pro Monthly | $4.99 | per month |
| Continued Support | $9.99 | per month |
| Pro Annual | $19.99 | per year |
| Quartermaster Pro | $29.99 | one-time |


## Frequently asked questions

### Is Calibre Sync free?

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

### Is Quartermaster free?

Quartermaster is free to download, with in-app purchases available.

### Which has better reviews, Calibre Sync or Quartermaster?

Quartermaster is rated higher. Calibre Sync averages 3.9 out of 5 from 55 ratings, while Quartermaster averages 5.0 from 42 ratings.

### Do Calibre Sync or Quartermaster have ads?

Neither Calibre Sync nor Quartermaster shows ads.

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

Calibre Sync ships an update weekly, and Quartermaster every 2 weeks. Most recently, Calibre Sync was updated on October 13, 2026 and Quartermaster on October 13, 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.*