# STS vs PLC Simulator 2, Ladder Logic

The clearest difference is update cadence: PLC Simulator 2, Ladder Logic at every 6 days against STS's every 5 months. PLC Simulator 2, Ladder Logic also leads on ratings volume (121 vs 1). STS's advantage is iOS requirement (12.2 vs 15.0). On price, rating, 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.

On the App Store both sit at effectively the same score — 5.0 for STS against 4.9 for PLC Simulator 2, Ladder Logic. That said, the two scores are not equally well evidenced: PLC Simulator 2, Ladder Logic has 121 ratings behind it against 1, so its average is the more settled of the two.

STS ships an update every 5 months, PLC Simulator 2, Ladder Logic every 6 days. The most recent releases landed on October 16, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | STS | PLC Simulator 2, Ladder Logic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sts-soft-starter-simulation/id1409663811/reviews)** | [4.9 (121 ratings)](https://appshunter.io/ios/app/plc-simulator-2-ladder-logic/id1672572436/reviews) |
| Number of ratings | 1 | **121** |
| Positive reviews | — | 84.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 6 days** |
| Monetization | Free | Free |
| Size | 67 MB | 29 MB |
| Requires iOS | **12.2** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siemens AG](https://appshunter.io/developer/394503271) | [David White](https://appshunter.io/developer/911163945) |

## 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


### PLC Simulator 2, Ladder Logic

[App page](https://appshunter.io/ios/app/plc-simulator-2-ladder-logic/id1672572436)

This application enables students and professionals to test and explore basic PLC programming using ladder logic on their mobile devices. It supports various instructions, configurable rungs, and includes interactive animations for a hands-on learning experience. Save and modify up to 20 programs, with preloaded examples to aid understanding.

**Highlights:** Configurable rungs, Input/Output descriptions, Ladder logic simulation, Save up to 20 programs, Interactive animations, Preloaded example programs

**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 PLC Simulator 2, Ladder Logic free?

PLC Simulator 2, Ladder Logic is free to download, with no in-app purchases.

### Which has better reviews, STS or PLC Simulator 2, Ladder Logic?

STS is rated higher. STS averages 5.0 out of 5 from 1 ratings, while PLC Simulator 2, Ladder Logic averages 4.9 from 121 ratings.

### Do STS or PLC Simulator 2, Ladder Logic have ads?

Neither STS nor PLC Simulator 2, Ladder Logic shows ads.

### Which is updated more often, STS or PLC Simulator 2, Ladder Logic?

STS ships an update every 5 months, and PLC Simulator 2, Ladder Logic every 6 days. Most recently, STS was updated on October 16, 2026 and PLC Simulator 2, Ladder Logic on October 20, 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.*