# Quill vs Reader AI

The clearest difference is in-app purchases: Quill at none against Reader AI's 3. On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Reader AI sells 3 in-app purchases, starting at $6.99 per month. Quill asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Quill against 5.0 for Reader AI. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

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

## The numbers

| Metric | Quill | Reader AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/quill-ai-book-reader/id6762075206/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/reader-ai-read-and-learn/id6806736317/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 6 days** |
| Monetization | **Free** | Freemium |
| Size | 20 MB | 34 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 12+ |
| Developer | [思涵 岳](https://appshunter.io/developer/1885417868) | [江 刘](https://appshunter.io/developer/1672554088) |

## What reviewers say

### 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


### Reader AI

[App page](https://appshunter.io/ios/app/reader-ai-read-and-learn/id6806736317)

This AI-powered reader helps you understand books by providing contextual word definitions, sentence explanations, and passage summaries. You can also chat with AI about the content, convert books to audiobooks, and save new vocabulary.

**Highlights:** Contextual word definitions, AI sentence and passage explanations, Book chat with AI, Convert books to audiobooks, Learning notebook for vocabulary, Import various book formats, PDF annotation

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 每月 | $6.99 | per month |
| 每季 | $19.99 | per 3 months |
| 每年 | $69.99 | per year |


## Frequently asked questions

### Is Quill free?

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

### Is Reader AI free?

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

### Which has better reviews, Quill or Reader AI?

Quill and Reader AI are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Quill or Reader AI have ads?

Neither Quill nor Reader AI shows ads.

### Which is updated more often, Quill or Reader AI?

Quill ships an update every 9 days, and Reader AI every 6 days. Most recently, Quill was updated on October 6, 2026 and Reader AI on October 9, 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.*