# OPTICHECK Flow Mobile vs S4C

The clearest difference is rating: OPTICHECK Flow Mobile at 4.0 against S4C's 1.0. S4C's advantage is iOS requirement (11.0 vs 16.4). On price, ratings volume, update cadence and ads there is nothing between them.

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

OPTICHECK Flow Mobile holds the better App Store score, 4.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

OPTICHECK Flow Mobile ships an update every 3 months, S4C every 2 months. The most recent releases landed on September 23, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | OPTICHECK Flow Mobile | S4C |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/opticheck-flow-mobile/id1476806101/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/s4c-us/id1511502113/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 359 MB | 38 MB |
| Requires iOS | 16.4 | **11.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KROHNE Messtechnik GmbH](https://appshunter.io/developer/1445655816) | [SUTO iTEC (China) Co. Ltd](https://appshunter.io/developer/1511502112) |

## What reviewers say

### OPTICHECK Flow Mobile

[App page](https://appshunter.io/ios/app/opticheck-flow-mobile/id1476806101)

This utility app facilitates the wireless setup, verification, and ongoing monitoring of specific KROHNE flow meters. It enables secure Bluetooth® connectivity for device configuration and performance checks without interrupting ongoing measurements.

**Highlights:** Wireless device commissioning, Device parameterization via Bluetooth®, Verification without measurement interruption, Monitoring of meter performance, Monitoring of application parameters

**Features:** macOS Compatibility, Vision Pro support

**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 OPTICHECK Flow Mobile free?

OPTICHECK Flow Mobile is free to download, with no in-app purchases.

### Is S4C free?

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

### Which has better reviews, OPTICHECK Flow Mobile or S4C?

OPTICHECK Flow Mobile is rated higher. OPTICHECK Flow Mobile averages 4.0 out of 5 from 2 ratings, while S4C averages 1.0 from 1 ratings.

### Do OPTICHECK Flow Mobile or S4C have ads?

Neither OPTICHECK Flow Mobile nor S4C shows ads.

### Which is updated more often, OPTICHECK Flow Mobile or S4C?

OPTICHECK Flow Mobile ships an update every 3 months, and S4C every 2 months. Most recently, OPTICHECK Flow Mobile was updated on September 23, 2026 and S4C on June 4, 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.*