# TheGrey.app vs PDF Studio

The clearest difference is update cadence: TheGrey.app at every 3 days against PDF Studio's weekly. TheGrey.app also leads on iOS requirement (16.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. TheGrey.app sells 1 one-off in-app purchase and PDF Studio sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

TheGrey.app ships an update every 3 days, PDF Studio weekly. The most recent releases landed on October 1, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | TheGrey.app | PDF Studio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Weekly |
| Size | 1 MB | 6 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hsieh ChiaMing](https://appshunter.io/developer/1891046685) | [Birkan Aksoy](https://appshunter.io/developer/1626910993) |

## What reviewers say

### TheGrey.app

[App page](https://appshunter.io/ios/app/thegreyapp/id6761714035)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| The Grey Platinum | $2.99 | one-time |


### PDF Studio

[App page](https://appshunter.io/ios/app/pdf-studio-reader-and-tools/id6781038759)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Studio Pro | $9.99 | per year |
| PDF Studio Pro (Lifetime) | $24.99 | one-time |


## Frequently asked questions

### Is TheGrey.app free?

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

### Is PDF Studio free?

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

### Do TheGrey.app or PDF Studio have ads?

Neither TheGrey.app nor PDF Studio shows ads.

### Which is updated more often, TheGrey.app or PDF Studio?

TheGrey.app ships an update every 3 days, and PDF Studio weekly. Most recently, TheGrey.app was updated on October 1, 2026 and PDF Studio on October 14, 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.*