# The Ebook Converter vs Calibre Sync

The clearest difference is price: The Ebook Converter at Free against Calibre Sync's $4.99. The Ebook Converter also leads on rating (4.5 vs 3.9) and ratings volume (2.5K vs 55). Calibre Sync's advantage is in-app purchases (none vs 5) and review sentiment (62% vs 31%). On ads, device support and iOS requirement there is nothing between them.

The Ebook Converter is free to download; Calibre Sync costs $4.99 up front. The Ebook Converter sells 5 in-app purchases, starting at $0.99 per month. Calibre Sync asks for nothing beyond the download.

The Ebook Converter holds the better App Store score, 4.5 against 3.9. That said, the two scores are not equally well evidenced: The Ebook Converter has 2.5K ratings behind it against 55, so its average is the more settled of the two. Written reviews complicate that: 31% of The Ebook Converter's written reviews are positive against 62% of Calibre Sync's, so the app with the better star average is not the one people write more warmly about.

The Ebook Converter ships an update every 3 months, Calibre Sync weekly. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | The Ebook Converter | Calibre Sync |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.5 (2.5K ratings)](https://appshunter.io/ios/app/the-ebook-converter/id890503038/reviews)** | [3.9 (55 ratings)](https://appshunter.io/ios/app/calibre-sync/id1609138078/reviews) |
| Number of ratings | **2.5K** | 55 |
| Positive reviews | 31.0% of reviews | **61.8% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | **Freemium** | Paid |
| Size | 46 MB | 128 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Float Tech, LLC](https://appshunter.io/developer/483697886) | [DUONG THUY PHAM](https://appshunter.io/developer/1795008858) |

## What reviewers say

### The Ebook Converter

[App page](https://appshunter.io/ios/app/the-ebook-converter/id890503038)

Easily convert ebooks between numerous formats like EPUB, MOBI, and PDF. Simply select your file, choose an output format, and convert in seconds. Save, share, or open converted files in your preferred reader apps.

**Highlights:** Convert between major ebook formats, Supports EPUB, MOBI, PDF, TXT, AZW3, and more, Fast conversion in seconds, Save, share, or open converted files, In-app file browser, Cloud and local conversion options

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Pass | $0.99 | per month |
| Premium Pass | $3.99 | per month |
| Lifetime Pass | $9.99 | one-time |
| Lifetime Pass | $19.99 | one-time |
| Lifetime Pass Promo | $29.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Fast conversion
- 💡 Useful for converting ebooks
- 😊 Great app

**What reviewers complain about**

- 🐛 Conversion issues
- 🔒 Requires subscription for full functionality
- 💰 Not free
- 🤔 Misleading description

**Reported bugs**

- Conversion failures
- Corrupted output files
- Compatibility issues with certain devices

**Requested features**

- Support for more file formats
- Batch conversion option
- Ability to rename converted files


### Calibre Sync

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

Access and manage your Calibre ebook libraries from your mobile device. Sync with popular cloud services or connect wirelessly to your desktop Calibre. Browse, search, download, and organize your collection.

**Highlights:** Access Calibre libraries from cloud services, Wireless connection to Calibre desktop, Browse, sort, and search books, Download books to your device, Support for multiple libraries and accounts, Send books to Kindle, Customizable book list layouts

**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


## Frequently asked questions

### Is The Ebook Converter free?

The Ebook Converter is free to download, with in-app purchases available.

### Is Calibre Sync free?

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

### Which has better reviews, The Ebook Converter or Calibre Sync?

The Ebook Converter is rated higher. The Ebook Converter averages 4.5 out of 5 from 2.5K ratings, while Calibre Sync averages 3.9 from 55 ratings.

### Do The Ebook Converter or Calibre Sync have ads?

Neither The Ebook Converter nor Calibre Sync shows ads.

### Which is updated more often, The Ebook Converter or Calibre Sync?

The Ebook Converter ships an update every 3 months, and Calibre Sync weekly. Most recently, The Ebook Converter was updated on November 6, 2026 and Calibre Sync on November 7, 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.*