# SKF Shaft alignment vs PCompress

The clearest difference is rating: PCompress at 5.0 against SKF Shaft alignment's 3.7. SKF Shaft alignment's advantage is ratings volume (10 vs 1) and iOS requirement (16.0 vs 18.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PCompress holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: SKF Shaft alignment has 10 ratings behind it against 1, so its average is the more settled of the two.

SKF Shaft alignment ships an update every 3 months, PCompress every 2 months. The most recent releases landed on October 21, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | SKF Shaft alignment | PCompress |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (10 ratings)](https://appshunter.io/ios/app/skf-shaft-alignment/id990162436/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pcompress/id6756801649/reviews)** |
| Number of ratings | **10** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 72 MB | 2 MB |
| Requires iOS | **16.0** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SKF](https://appshunter.io/developer/472922971) | [APPLOAD LLC (NJ)](https://appshunter.io/developer/1825689362) |

## What reviewers say

### SKF Shaft alignment

[App page](https://appshunter.io/ios/app/skf-shaft-alignment/id990162436)

This utility app, when paired with specific hardware, enables precise and intuitive shaft alignment for rotating machinery. It offers a demonstration mode for experiencing the full process without the hardware and generates automatic, shareable reports.

**Highlights:** Intuitive shaft alignment with hardware, Flexible three-position measurement, Demonstration mode for full experience, Automatic, customizable alignment reports, Explanatory setup and measurement videos, 3D animations for guidance, Machine library with QR code scanner

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

**In-app purchases:** none


### PCompress

[App page](https://appshunter.io/ios/app/pcompress/id6756801649)

This app quickly scans and shrinks PDF files on your iPhone or iPad. It offers multiple compression levels and batch processing for efficient file management. Your documents remain private as all processing occurs locally on your device.

**Highlights:** Scan and compress PDFs, Multiple compression levels, Batch processing, Local, private processing, Intuitive interface, Direct sharing

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SKF Shaft alignment free?

SKF Shaft alignment is free to download, with no in-app purchases.

### Is PCompress free?

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

### Which has better reviews, SKF Shaft alignment or PCompress?

PCompress is rated higher. SKF Shaft alignment averages 3.7 out of 5 from 10 ratings, while PCompress averages 5.0 from 1 ratings.

### Do SKF Shaft alignment or PCompress have ads?

Neither SKF Shaft alignment nor PCompress shows ads.

### Which is updated more often, SKF Shaft alignment or PCompress?

SKF Shaft alignment ships an update every 3 months, and PCompress every 2 months. Most recently, SKF Shaft alignment was updated on October 21, 2026 and PCompress on October 11, 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.*