# Compress PDF vs PDF Under

Compress PDF and PDF Under are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Compress PDF sells 3 in-app purchases, starting at $2.99 per 7 days and PDF Under sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Compress PDF ships an update fortnightly, PDF Under every 3 weeks. The most recent releases landed on October 2, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Compress PDF | PDF Under |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (14 ratings)](https://appshunter.io/ios/app/compress-pdf-resize-pdf/id6753917813/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 3 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [PremiumAl Limited](https://appshunter.io/developer/1865407557) | [Emre KABOGLU](https://appshunter.io/developer/1892627286) |

## What reviewers say

### Compress PDF

[App page](https://appshunter.io/ios/app/compress-pdf-resize-pdf/id6753917813)

Easily reduce the size of PDF files for efficient storage and sharing. Offers adjustable quality levels and on-device processing for privacy. An optional Pro upgrade provides unlimited compressions, target file size control, and an ad-free experience.

**Highlights:** Compress PDFs by adjustable quality, Reduce PDF file size quickly, Preview original vs. compressed size, Share or save compressed PDFs, Private and secure on-device processing, Target file size control (Pro), Unlimited compressions (Pro)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| Premium | $4.99 | one-time |
| Premium | $5.99 | one-time |


### 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 |


## Frequently asked questions

### Is Compress PDF free?

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

### Is PDF Under free?

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

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

Neither Compress PDF nor PDF Under shows ads.

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

Compress PDF ships an update fortnightly, and PDF Under every 3 weeks. Most recently, Compress PDF was updated on October 2, 2026 and PDF Under on October 9, 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.*