# PDF Viewer vs CHMOD Lab

The clearest difference is iOS requirement: PDF Viewer at 15.6 against CHMOD Lab's 17.6. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | PDF Viewer | CHMOD Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Size | 71 MB | 2 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Chengdu Mulinshen Technology Co., Ltd](https://appshunter.io/developer/1856488734) | [Guy Miller](https://appshunter.io/developer/1865478036) |

## What reviewers say

### PDF Viewer

[App page](https://appshunter.io/ios/app/pdf-viewer-ultrapdf/id6755807685)

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

**In-app purchases:** none


### CHMOD Lab

[App page](https://appshunter.io/ios/app/chmod-lab-linux-permissions/id6757230787)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PDF Viewer free?

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

### Is CHMOD Lab free?

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

### Do PDF Viewer or CHMOD Lab have ads?

Neither PDF Viewer nor CHMOD Lab shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*