# TROVIS 55Pro vs S4C

The clearest difference is update cadence: S4C at every 2 months against TROVIS 55Pro's every 8 months. TROVIS 55Pro's advantage is iOS requirement (9.0 vs 11.0). 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.

TROVIS 55Pro ships an update every 8 months, S4C every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | TROVIS 55Pro | S4C |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/s4c-us/id1511502113/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 23 MB | 38 MB |
| Requires iOS | **9.0** | 11.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KT-Elektronik, Klaucke und Partner GmbH](https://appshunter.io/developer/943003350) | [SUTO iTEC (China) Co. Ltd](https://appshunter.io/developer/1511502112) |

## What reviewers say

### TROVIS 55Pro

[App page](https://appshunter.io/ios/app/trovis-55pro/id943003351)

**Features:** macOS Compatibility

**In-app purchases:** none


### S4C

[App page](https://appshunter.io/ios/app/s4c-us/id1511502113)

This utility app allows users to configure a specific ultrasonic sensor model. It provides real-time data visualization from the connected sensors, aiding in setup and monitoring.

**Highlights:** Configure ultrasonic sensor S461, View real-time sensor data, Sensor monitoring, US configuration

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is TROVIS 55Pro free?

TROVIS 55Pro is free to download, with no in-app purchases.

### Is S4C free?

S4C is free to download, with no in-app purchases.

### Do TROVIS 55Pro or S4C have ads?

Neither TROVIS 55Pro nor S4C shows ads.

### Which is updated more often, TROVIS 55Pro or S4C?

TROVIS 55Pro ships an update every 8 months, and S4C every 2 months. Most recently, TROVIS 55Pro was updated on November 1, 2026 and S4C on November 3, 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.*