# PDF Squeezer vs 4DI

The clearest difference is in-app purchases: 4DI at none against PDF Squeezer's 1. 4DI also leads on update cadence (weekly vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. PDF Squeezer sells 1 one-off in-app purchase. 4DI asks for nothing beyond the download.

PDF Squeezer ships an update monthly, 4DI weekly. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | PDF Squeezer | 4DI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (22 ratings)](https://appshunter.io/ios/app/pdf-squeezer/id6478766883/reviews)** | — |
| Number of ratings | **22** | — |
| Positive reviews | 63.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 29 MB | 5 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Witt](https://appshunter.io/developer/1438848391) | [Robert Poetzsch](https://appshunter.io/developer/1860642630) |

## What reviewers say

### PDF Squeezer

[App page](https://appshunter.io/ios/app/pdf-squeezer/id6478766883)

Reduce PDF file sizes on your iPhone or iPad with customizable compression settings. Preview changes before saving and process files securely offline. Automate tasks with iOS Shortcuts integration and compress multiple files at once.

**Highlights:** Customizable compression settings, Preview compressed PDFs, Offline, on-device processing, iOS Shortcuts integration, Batch compression

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $9.99 | one-time |


### 4DI

[App page](https://appshunter.io/ios/app/4di-data-integrity-tool/id6760180866)

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

**In-app purchases:** none


## Frequently asked questions

### Is PDF Squeezer free?

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

### Is 4DI free?

4DI is free to download, with no in-app purchases.

### Do PDF Squeezer or 4DI have ads?

Neither PDF Squeezer nor 4DI shows ads.

### Which is updated more often, PDF Squeezer or 4DI?

PDF Squeezer ships an update monthly, and 4DI weekly. Most recently, PDF Squeezer was updated on October 27, 2026 and 4DI on October 25, 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.*