# ReadCaddy vs Quill

The clearest difference is in-app purchases: Quill at none against ReadCaddy's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ReadCaddy sells 3 in-app purchases, starting at $2.99 per month. Quill asks for nothing beyond the download.

ReadCaddy ships an update weekly, Quill every 9 days. The most recent releases landed on October 7, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | ReadCaddy | Quill |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/quill-ai-book-reader/id6762075206/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 9 days |
| Monetization | — | Free |
| Size | 49 MB | 20 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Oren Lahav](https://appshunter.io/developer/1822632366) | [思涵 岳](https://appshunter.io/developer/1885417868) |

## What reviewers say

### ReadCaddy

[App page](https://appshunter.io/ios/app/readcaddy/id6759986697)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReadCaddy AI Text (Monthly) | $2.99 | per month |
| ReadCaddy AI Starter (Monthly) | $4.99 | per month |
| ReadCaddy AI Pro (Monthly) | $9.99 | per month |


### Quill

[App page](https://appshunter.io/ios/app/quill-ai-book-reader/id6762075206)

This application enhances your reading experience by providing AI-powered definitions, translations, and contextual explanations for any word or passage within your imported EPUB and PDF books. It offers instant insights to deepen comprehension.

**Highlights:** AI-powered explanations, Instant definitions, Contextual understanding, Import EPUB and PDF, Word and passage lookup

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

**In-app purchases:** none


## Frequently asked questions

### Is ReadCaddy free?

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

### Is Quill free?

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

### Do ReadCaddy or Quill have ads?

Neither ReadCaddy nor Quill shows ads.

### Which is updated more often, ReadCaddy or Quill?

ReadCaddy ships an update weekly, and Quill every 9 days. Most recently, ReadCaddy was updated on October 7, 2026 and Quill on October 6, 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.*