# AI PDF Reader vs Viewer3D

The clearest difference is price: AI PDF Reader at Free against Viewer3D's $0.99. Viewer3D's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

AI PDF Reader is free to download; Viewer3D costs $0.99 up front. AI PDF Reader sells 2 in-app purchases, starting at $6.99 per 7 days. Viewer3D asks for nothing beyond the download.

AI PDF Reader ships an update every 16 months, Viewer3D every 3 months. The most recent releases landed on October 13, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | AI PDF Reader | Viewer3D |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 16 months | **Every 3 months** |
| Size | 61 MB | 24 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HK TECHNOSOFT](https://appshunter.io/developer/1779078064) | [北京秤鑫科技有限公司](https://appshunter.io/developer/1865113112) |

## What reviewers say

### AI PDF Reader

[App page](https://appshunter.io/ios/app/ai-pdf-reader-pdf-speaker/id6746432323)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reader One Week | $6.99 | per 7 days |
| Reader One Year | $44.99 | per year |


### Viewer3D

[App page](https://appshunter.io/ios/app/viewer3d/id6757183916)

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

**In-app purchases:** none


## Frequently asked questions

### Is AI PDF Reader free?

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

### Is Viewer3D free?

Viewer3D costs $0.99, with no in-app purchases.

### Do AI PDF Reader or Viewer3D have ads?

AI PDF Reader shows ads; Viewer3D does not.

### Which is updated more often, AI PDF Reader or Viewer3D?

AI PDF Reader ships an update every 16 months, and Viewer3D every 3 months. Most recently, AI PDF Reader was updated on October 13, 2026 and Viewer3D on October 18, 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.*