# Interchange vs Emma’s Library

The clearest difference is iOS requirement: Interchange at 12.2 against Emma’s Library's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Interchange sells 9 in-app purchases, starting at $2.49 per month and Emma’s Library sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

Interchange ships an update every 6 days, Emma’s Library weekly. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Interchange | Emma’s Library |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (212 ratings)](https://appshunter.io/ios/app/interchange-ebook-converter/id1198053063/reviews)** | — |
| Number of ratings | **212** | — |
| Positive reviews | 73.2% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Weekly |
| Monetization | Subscription | — |
| Size | 103 MB | 8 MB |
| Requires iOS | **12.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 12+ |
| Developer | [小龙 刘](https://appshunter.io/developer/1171012527) | [Qia Li](https://appshunter.io/developer/6791600310) |

## What reviewers say

### Interchange

[App page](https://appshunter.io/ios/app/interchange-ebook-converter/id1198053063)

Convert and read a wide variety of ebook formats, including DRM-protected files. Offers extensive customization for reading, note-taking, and book management. Supports multiple import methods and file decompression.

**Highlights:** Multiple ebook format conversion, DRM removal for Kindle books, Customizable ebook reader layout, Note-taking and bookmarking, Customizable book covers, Multiple page-turning methods, Comic reading support, Advanced book management

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UNLOCK ALL FEATURES, REMOVE AD | $2.49 | per month |
| UNLOCK ALL FEATURES, REMOVE AD | $4.99 | per year |
| REMOVE ALL ADS | $1.99 | one-time |
| Conversions+50 | $1.99 | one-time |
| All formats | $1.99 | one-time |
| Conversions+600 | $2.99 | one-time |
| Conversions+1000 | $3.99 | one-time |
| ALL ACCESS, REMOVING AD | $9.99 | one-time |
| All advanced features | $9.99 | one-time |

**What reviewers like**

- 🚀 Fast and quick conversion speeds
- 👍 Easy to use interface
- 📁 Supports multiple file formats
- 💰 Free version available
- 📧 Can send files to Kindle

**What reviewers complain about**

- 🐛 Frequent app crashes and crashes on cover changes
- 😤 Intrusive and excessive advertising
- ❌ Poor conversion quality for PDFs
- 🔤 Confusing and non-intuitive UI
- 🌐 Inconsistent English localization

**Reported bugs**

- App crashes when changing covers
- Ad close buttons are too small or non-functional
- Converted files show as 0 bytes
- App crashes when deleting empty files
- Pro version features still require upgrade prompts

**Requested features**

- Batch conversion capability
- Right-to-left text support for Arabic books
- Proper cover image inclusion in conversions
- Unlimited conversions
- iPad Pro landscape orientation support


### Emma’s Library

[App page](https://appshunter.io/ios/app/emmas-library/id6791600308)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Emma Premium Monthly | $5.99 | per month |
| Emma Premium Annual | $59.99 | per year |


## Frequently asked questions

### Is Interchange free?

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

### Is Emma’s Library free?

Emma’s Library is free to download, with in-app purchases available.

### Do Interchange or Emma’s Library have ads?

Neither Interchange nor Emma’s Library shows ads.

### Which is updated more often, Interchange or Emma’s Library?

Interchange ships an update every 6 days, and Emma’s Library weekly. Most recently, Interchange was updated on November 6, 2026 and Emma’s Library on October 31, 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.*