# Regal Vault vs Reader AI

The clearest difference is in-app purchases: Regal Vault at none against Reader AI's 3. Reader AI's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

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

Both ship on a similar rhythm, roughly every 6 days. The most recent releases landed on October 21, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Regal Vault | Reader AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/reader-ai-read-and-learn/id6806736317/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 days | Every 6 days |
| Monetization | — | Freemium |
| Size | 8 MB | 34 MB |
| Requires iOS | 16 | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 12+ |
| Developer | [Moin Macarthur](https://appshunter.io/developer/6789523888) | [江 刘](https://appshunter.io/developer/1672554088) |

## What reviewers say

### Regal Vault

[App page](https://appshunter.io/ios/app/regal-vault/id6800025586)

**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 Regal Vault free?

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

### Is Reader AI free?

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

### Do Regal Vault or Reader AI have ads?

Regal Vault shows ads; Reader AI does not.

### Which is updated more often, Regal Vault or Reader AI?

Regal Vault ships an update every 6 days, and Reader AI every 6 days. Most recently, Regal Vault was updated on October 21, 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.*