# Instant Testing vs PDF Compressor

The clearest difference is in-app purchases: Instant Testing at none against PDF Compressor's 2. PDF Compressor's advantage is update cadence (fortnightly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. PDF Compressor sells 2 in-app purchases, starting at $8.99 per month. Instant Testing asks for nothing beyond the download.

Instant Testing ships an update every 2 months, PDF Compressor fortnightly. The most recent releases landed on September 28, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Instant Testing | PDF Compressor |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Size | 79 MB | 48 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Clapptron Technologies Private Limited](https://appshunter.io/developer/1446260957) | [Soufiane Bouziane](https://appshunter.io/developer/1796428527) |

## What reviewers say

### Instant Testing

[App page](https://appshunter.io/ios/app/instant-testing/id6587570917)

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

**In-app purchases:** none


### PDF Compressor

[App page](https://appshunter.io/ios/app/pdf-compressor-compress-size/id6757967560)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $8.99 | per month |
| Yearly Subscription | $39.99 | per year |


## Frequently asked questions

### Is Instant Testing free?

Instant Testing is free to download, with no in-app purchases.

### Is PDF Compressor free?

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

### Do Instant Testing or PDF Compressor have ads?

Neither Instant Testing nor PDF Compressor shows ads.

### Which is updated more often, Instant Testing or PDF Compressor?

Instant Testing ships an update every 2 months, and PDF Compressor fortnightly. Most recently, Instant Testing was updated on September 28, 2026 and PDF Compressor on September 30, 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.*