# sDrives vs STS

The clearest difference is rating: STS at 5.0 against sDrives's 4.5. STS also leads on in-app purchases (none vs 1). sDrives's advantage is ratings volume (27 vs 1) and update cadence (every 2 months vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. sDrives sells 1 one-off in-app purchase. STS asks for nothing beyond the download.

STS holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: sDrives has 27 ratings behind it against 1, so its average is the more settled of the two.

sDrives ships an update every 2 months, STS every 5 months. The most recent releases landed on September 21, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | sDrives | STS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (27 ratings)](https://appshunter.io/ios/app/sdrives-vfd-help/id1238863129/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sts-soft-starter-simulation/id1409663811/reviews)** |
| Number of ratings | **27** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 12 MB | 67 MB |
| Requires iOS | **12.0** | 12.2 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Evgeny Makarenkov](https://appshunter.io/developer/1214502122) | [Siemens AG](https://appshunter.io/developer/394503271) |

## What reviewers say

### sDrives

[App page](https://appshunter.io/ios/app/sdrives-vfd-help/id1238863129)

Access alarm descriptions, troubleshooting guides, and user manuals for Siemens drives. This professional tool provides essential information for commissioning and service, supporting a wide range of drive models.

**Highlights:** Quick alarm description access, Troubleshooting guides, Links to user manuals, Support for multiple Siemens drive models, Multi-language alarm descriptions, In-app purchase to unlock all drives

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Drives | $1.99 | 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 sDrives free?

sDrives is free to download, with in-app purchases available.

### Is STS free?

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

### Which has better reviews, sDrives or STS?

STS is rated higher. sDrives averages 4.5 out of 5 from 27 ratings, while STS averages 5.0 from 1 ratings.

### Do sDrives or STS have ads?

Neither sDrives nor STS shows ads.

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

sDrives ships an update every 2 months, and STS every 5 months. Most recently, sDrives was updated on September 21, 2026 and STS on October 8, 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.*