# iS7 vs STS

The clearest difference is price: STS at Free against iS7's $14.99. STS also leads on in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

STS is free to download; iS7 costs $14.99 up front. iS7 sells 1 one-off in-app purchase. STS asks for nothing beyond the download.

iS7 ships an update every 3 months, STS every 5 months. The most recent releases landed on December 9, 2025 and June 29, 2026 respectively.

## The numbers

| Metric | iS7 | STS |
| --- | --- | --- |
| Price | $14.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sts-soft-starter-simulation/id1409663811/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | — | Free |
| Size | 45 MB | 67 MB |
| Requires iOS | **12.0** | 12.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carlo Trotti](https://appshunter.io/developer/594070838) | [Siemens AG](https://appshunter.io/developer/394503271) |

## What reviewers say

### iS7

[App page](https://appshunter.io/ios/app/is7/id594070835)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Alarms | $2.99 | one-time |


### 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 iS7 free?

iS7 costs $14.99, and also offers in-app purchases.

### Is STS free?

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

### Do iS7 or STS have ads?

Neither iS7 nor STS shows ads.

### Which is updated more often, iS7 or STS?

iS7 ships an update every 3 months, and STS every 5 months. Most recently, iS7 was updated on December 9, 2025 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.*