# STS vs TimingMachine

The clearest difference is price: STS at Free against TimingMachine's $8.99. STS also leads on iOS requirement (12.2 vs 26.0). TimingMachine's advantage is update cadence (every 11 days vs every 5 months). On ads, in-app purchases and device support there is nothing between them.

STS is free to download; TimingMachine costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

STS ships an update every 5 months, TimingMachine every 11 days. The most recent releases landed on June 29, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | STS | TimingMachine |
| --- | --- | --- |
| Price | **Free** | $8.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sts-soft-starter-simulation/id1409663811/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 11 days** |
| Monetization | **Free** | Paid |
| Size | 67 MB | 32 MB |
| Requires iOS | **12.2** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siemens AG](https://appshunter.io/developer/394503271) | [keywerks GmbH](https://appshunter.io/developer/1336049861) |

## What reviewers say

### 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


### TimingMachine

[App page](https://appshunter.io/ios/app/timingmachine/id1499524052)

This tool helps determine and compare engine timing for 2-stroke engines. It calculates piston positions, the effect of spacers, and offers graphical representations. Results can be exported as PDF or with custom text and images.

**Highlights:** Convert measurements to engine timings, Convert engine timings to measurements, Compare engine timings, Calculate cylinder spacer effects, Graphical representation of timings, Export results as PDF, Snapshot function for storing setups

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

**In-app purchases:** none


## Frequently asked questions

### Is STS free?

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

### Is TimingMachine free?

TimingMachine costs $8.99, with no in-app purchases.

### Do STS or TimingMachine have ads?

Neither STS nor TimingMachine shows ads.

### Which is updated more often, STS or TimingMachine?

STS ships an update every 5 months, and TimingMachine every 11 days. Most recently, STS was updated on June 29, 2026 and TimingMachine on September 21, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*