# STS vs PETLOT

The clearest difference is update cadence: PETLOT at every 2 weeks against STS's every 5 months. STS's advantage is iOS requirement (12.2 vs 15.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

STS ships an update every 5 months, PETLOT every 2 weeks. The most recent releases landed on October 25, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | STS | PETLOT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sts-soft-starter-simulation/id1409663811/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 67 MB | 129 MB |
| Requires iOS | **12.2** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siemens AG](https://appshunter.io/developer/394503271) | [KARAN RAMI](https://appshunter.io/developer/1896724093) |

## 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


### PETLOT

[App page](https://appshunter.io/ios/app/petlot/id6797278812)

**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 PETLOT free?

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

### Do STS or PETLOT have ads?

Neither STS nor PETLOT shows ads.

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

STS ships an update every 5 months, and PETLOT every 2 weeks. Most recently, STS was updated on October 25, 2026 and PETLOT on October 12, 2026.

---

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