# PDF Under vs PDF Compressor

The clearest difference is in-app purchases: PDF Compressor at none against PDF Under's 3. PDF Compressor also leads on update cadence (every 8 days vs every 3 weeks) and iOS requirement (15.0 vs 17.6). PDF Under's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. PDF Under sells 3 in-app purchases, starting at $1.99 per 7 days. PDF Compressor asks for nothing beyond the download.

PDF Under ships an update every 3 weeks, PDF Compressor every 8 days. The most recent releases landed on October 9, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | PDF Under | PDF Compressor |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 8 days** |
| Size | 3 MB | 5 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Emre KABOGLU](https://appshunter.io/developer/1892627286) | [TAREQ ALHUSAINI](https://appshunter.io/developer/1259393688) |

## What reviewers say

### PDF Under

[App page](https://appshunter.io/ios/app/pdf-under-pdf-compressor/id6804278677)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Under Weekly | $1.99 | per 7 days |
| PDF Under Yearly | $13.99 | per year |
| PDF Under Lifetime | $19.99 | one-time |


### PDF Compressor

[App page](https://appshunter.io/ios/app/pdf-compressor-reduce-pdf/id6809077494)

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

**In-app purchases:** none


## Frequently asked questions

### Is PDF Under free?

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

### Is PDF Compressor free?

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

### Do PDF Under or PDF Compressor have ads?

PDF Compressor shows ads; PDF Under does not.

### Which is updated more often, PDF Under or PDF Compressor?

PDF Under ships an update every 3 weeks, and PDF Compressor every 8 days. Most recently, PDF Under was updated on October 9, 2026 and PDF Compressor on October 1, 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.*