# PDF Compression vs SkyBday Pro

The clearest difference is ads: SkyBday Pro at none against PDF Compression's shown. SkyBday Pro also leads on update cadence (every 2 days vs every 4 days) and iOS requirement (15.0 vs 18.5). On price, in-app purchases and device support there is nothing between them.

Both are free to download. PDF Compression sells 1 one-off in-app purchase and SkyBday Pro sells 4 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

PDF Compression ships an update every 4 days, SkyBday Pro every 2 days. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | PDF Compression | SkyBday Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/pdf-compression/id6752516285/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 days | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 19 MB | 83 MB |
| Requires iOS | 18.5 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Antonio Gonzalez de la aleja german](https://appshunter.io/developer/1839645711) | [Elevatis SA](https://appshunter.io/developer/1511388834) |

## What reviewers say

### PDF Compression

[App page](https://appshunter.io/ios/app/pdf-compression/id6752516285)

Easily reduce the size of your PDF files without sacrificing quality. This tool is perfect for students and professionals needing to optimize documents for storage, email, or sharing. Compress multiple files quickly and efficiently.

**Highlights:** Compress PDFs for free, Reduce file size to specific megabytes, Optimize documents for email and sharing, Compress multiple PDFs at once, Maintain document quality during compression, Convert PDFs to ZIP format

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### SkyBday Pro

[App page](https://appshunter.io/ios/app/skybday-pro/id6757096143)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SkyBday Premium | $5.99 | per month |
| 10 Crédits SMS | $2.99 | one-time |
| 50 Crédits SMS | $9.99 | one-time |
| 100 Crédits SMS | $17.99 | one-time |


## Frequently asked questions

### Is PDF Compression free?

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

### Is SkyBday Pro free?

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

### Do PDF Compression or SkyBday Pro have ads?

PDF Compression shows ads; SkyBday Pro does not.

### Which is updated more often, PDF Compression or SkyBday Pro?

PDF Compression ships an update every 4 days, and SkyBday Pro every 2 days. Most recently, PDF Compression was updated on October 1, 2026 and SkyBday Pro 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.*