# Automatic Gas vs AI Audiobook Reader

The clearest difference is in-app purchases: Automatic Gas at none against AI Audiobook Reader's 2. Automatic Gas also leads on iOS requirement (12.2 vs 18.0). AI Audiobook Reader's advantage is update cadence (every 9 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. AI Audiobook Reader sells 2 in-app purchases, starting at $9.99 per month. Automatic Gas asks for nothing beyond the download.

Automatic Gas ships an update every 3 months, AI Audiobook Reader every 9 days. Both last shipped on October 28, 2026.

## The numbers

| Metric | Automatic Gas | AI Audiobook Reader |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Size | 56 MB | 29 MB |
| Requires iOS | **12.2** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Rural Computer Consultants, Inc.](https://appshunter.io/developer/640795441) | [SlothEase](https://appshunter.io/developer/1816632091) |

## What reviewers say

### Automatic Gas

[App page](https://appshunter.io/ios/app/automatic-gas/id6754845707)

**Features:** macOS Compatibility

**In-app purchases:** none


### AI Audiobook Reader

[App page](https://appshunter.io/ios/app/ai-audiobook-reader-castly/id6768542554)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Castly Pro Monthly | $9.99 | per month |
| Castly Pro Annual | $49.99 | per year |


## Frequently asked questions

### Is Automatic Gas free?

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

### Is AI Audiobook Reader free?

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

### Do Automatic Gas or AI Audiobook Reader have ads?

Neither Automatic Gas nor AI Audiobook Reader shows ads.

### Which is updated more often, Automatic Gas or AI Audiobook Reader?

Automatic Gas ships an update every 3 months, and AI Audiobook Reader every 9 days. Most recently, Automatic Gas was updated on October 28, 2026 and AI Audiobook Reader on October 28, 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.*