# Ariel Quick Size vs SKF Shaft alignment

The clearest difference is rating: Ariel Quick Size at 5.0 against SKF Shaft alignment's 3.7. Ariel Quick Size also leads on iOS requirement (9.0 vs 16.0). SKF Shaft alignment's advantage is update cadence (every 3 months vs every 7 months) and ratings volume (10 vs 1). On price, review sentiment, 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.

Ariel Quick Size 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. Written reviews split almost evenly too, at 100% and 100% positive.

Ariel Quick Size ships an update every 7 months, SKF Shaft alignment every 3 months. The most recent releases landed on July 1, 2026 and August 9, 2026 respectively.

## The numbers

| Metric | Ariel Quick Size | SKF Shaft alignment |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ariel-quick-size/id571901596/reviews)** | [3.7 (10 ratings)](https://appshunter.io/ios/app/skf-shaft-alignment/id990162436/reviews) |
| Number of ratings | 1 | **10** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 31 MB | 72 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ariel Corporation](https://appshunter.io/developer/571901606) | [SKF](https://appshunter.io/developer/472922971) |

## What reviewers say

### Ariel Quick Size

[App page](https://appshunter.io/ios/app/ariel-quick-size/id571901596)

This utility app helps users estimate compressor configurations based on input pressures and flow requirements. It calculates needed horsepower or flow, suggests frame and cylinder configurations, and estimates stages, bore sizes, and discharge temperatures. Results can be emailed for further review.

**Highlights:** Horsepower or gas flow estimate, Compressor frame and cylinder configuration, Estimate required stages and bore sizes, Input gas specific gravity, English or Metric units, Email results

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Ariel Quick Size free?

Ariel Quick Size is free to download, with no in-app purchases.

### Is SKF Shaft alignment free?

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

### Which has better reviews, Ariel Quick Size or SKF Shaft alignment?

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

### Do Ariel Quick Size or SKF Shaft alignment have ads?

Neither Ariel Quick Size nor SKF Shaft alignment shows ads.

### Which is updated more often, Ariel Quick Size or SKF Shaft alignment?

Ariel Quick Size ships an update every 7 months, and SKF Shaft alignment every 3 months. Most recently, Ariel Quick Size was updated on July 1, 2026 and SKF Shaft alignment on August 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.*