# SKF Shaft alignment vs STS

The clearest difference is rating: STS at 5.0 against SKF Shaft alignment's 3.7. STS also leads on iOS requirement (12.2 vs 16.0). SKF Shaft alignment's advantage is ratings volume (10 vs 1). 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.

STS 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, STS every 5 months. The most recent releases landed on August 9, 2026 and June 29, 2026 respectively.

## The numbers

| Metric | SKF Shaft alignment | STS |
| --- | --- | --- |
| 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/sts-soft-starter-simulation/id1409663811/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 5 months |
| Monetization | Free | Free |
| Size | 72 MB | 67 MB |
| Requires iOS | 16.0 | **12.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SKF](https://appshunter.io/developer/472922971) | [Siemens AG](https://appshunter.io/developer/394503271) |

## 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


### STS

[App page](https://appshunter.io/ios/app/sts-soft-starter-simulation/id1409663811)

This utility helps users select the appropriate Siemens soft starter for their specific needs. It simulates applications based on various parameters and provides detailed reports, with direct links to product data.

**Highlights:** Soft starter application simulation, Input data for environment, motor, and load, Starting parameter configuration, Suggested soft starter selection, Simulation and component reports, Direct access to Siemens Industry Mall data

**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 STS free?

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

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

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

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

Neither SKF Shaft alignment nor STS shows ads.

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

SKF Shaft alignment ships an update every 3 months, and STS every 5 months. Most recently, SKF Shaft alignment was updated on August 9, 2026 and STS on June 29, 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.*