SKF Shaft alignment vs STS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SKF Shaft alignment
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.
- 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
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The Horizontal shaft alignment app is designed to be used with the SKF Shaft Alignment Tool TKSA 51 or TKSA 71. Together, the hardware and the app form an alignment system that allows shaft alignments of many rotating machines to be made in an intuitive and easy way. The system uses line laser to PSD technology that enables highly accurate and reliable shaft alignments. The hardware and its app communicate wirelessly via Bluetooth®. Without the hardware the app can nonetheless be used, as it features a fully functional demonstration mode allowing the complete alignment process to be experienced before purchasing the TKSA 51 or TKSA 71 instrument. KEY FEATURES: • Very easy-to-use – The Horizontal shaft alignment app focuses on making the main alignment tasks as easy as possible and enabling accurate shaft alignments. • Full measurement flexibility – The Horizontal shaft alignment app uses a flexible three position measurement method that allows measurements to start at any angle and if the space is limited alignments can be performed with a total of 40° rotation only. • Demonstration mode – The Horizontal shaft alignment app offers a fully functional demonstration mode allowing the complete alignment process to be experienced before purchasing a supported SKF Shaft Alignment Tool. • Automatic alignment report – Automatically generated alignment reports give a complete overview of the alignment process and results. The reports can be customised with additional notes, a machine picture, a signature and can easily be shared via email or cloud services. • Explanatory videos – Easy to follow videos demonstrating how to set up and perform accurate measurements using the TKSA 51 or TKSA 71. • 3D Animations – 3D animations guide the user through the alignment process, allowing accurate shaft alignment to be performed in a very easy way. • Machine library and QR code scanner – Helps keeping track of the machines that have been measured. Machine information like distances, the machine picture, and other details are saved for each machine and can be reused the next time the same machine is measured. QR codes can be scanned to identify a machine and quickly retrieve its details. The library can also be used for easy access to all the reports generated for each machine in one place. HARDWARE – SKF Shaft Alignment Tool TKSA 51 and TKSA 71: The SKF TKSA 51 and TKSA 71 systems use a pair of measurement units that are combined with laser transmitter and detectors to measure and correct shaft alignment with high accuracy and reliability. The data is transferred in real time through Bluetooth® 4.0 LE to the app. IMPORTANT NOTE: This app is designed to be used with the SKF Shaft Alignment Tool TKSA 51 or TKSA 71 hardware. The SKF TKSA 51 or TKSA 71 can be purchased separately from your local SKF Authorized Distributor. For more information and technical specifications about the SKF Shaft Alignment Tool, please visit our website.
STS
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.
- 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
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This application allows users to find the right Siemens soft starter for his specific application. Features: * Simulate a soft starter application based on your input data: ** Environment & supply ** Motor ** Load ** Starting parameters for the application ** Additional functions ** Starting profile * Select a suggested soft starter * Generate a report for a selected soft starter with the summary of the simulation and optional feeder main components * Direct access to selected soft starter data in the Siemens Industry Mall * Metrics: SI and Imperial * Languages: English, German, Chinese, French, Spanish, Portuguese, Turkish, Czech, Italian and Russian
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | SKF Shaft alignment | STS |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (10 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 10 — better | 1 |
| Update frequency | Every 3 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 12.2 — better |
| Further details — not scored | ||
| Size | 72 MB | 67 MB |
| Age rating | 4+ | 4+ |
| Developer | SKF | Siemens AG |
Customer experience
SKF Shaft alignment
STS
In-app purchases
SKF Shaft alignment
No in-app purchases
STS
No in-app purchases









