# Stack Testers Friend vs Kärcher Machine connect

The clearest difference is update cadence: Kärcher Machine connect at every 5 weeks against Stack Testers Friend's every 7 months. Stack Testers Friend's advantage is iOS requirement (13.0 vs 15.1). On price, review sentiment, 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.

Stack Testers Friend ships an update every 7 months, Kärcher Machine connect every 5 weeks. The most recent releases landed on July 7, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Stack Testers Friend | Kärcher Machine connect |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (8 ratings)](https://appshunter.io/ios/app/karcher-machine-connect/id1631119612/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 33 MB | 101 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lewis Holmes](https://appshunter.io/developer/1454834389) | [Alfred Kaercher SE & Co. KG](https://appshunter.io/developer/661626347) |

## What reviewers say

### Stack Testers Friend

[App page](https://appshunter.io/ios/app/stack-testers-friend/id1454834390)

This mobile toolkit provides essential on-site calculations for stack testers. Quickly perform gas conversions, probe position calculations, and other vital engineering tasks without needing a laptop. It's designed for environmental engineers needing immediate access to data while working in the field.

**Highlights:** Gas conversion calculations, Isokinetic sample position calculations, Extraction rate calculations, Gas density calculations, Particulate matter normalization, Calibration function calculations

**Features:** macOS Compatibility

**In-app purchases:** none


### Kärcher Machine connect

[App page](https://appshunter.io/ios/app/karcher-machine-connect/id1631119612)

Enhance your floor cleaning experience with smart control over your scrubber drier. Adjust settings, manage permissions, and access helpful advice for optimal performance.

**Highlights:** Machine display language settings, Cleaning head type selection, Adjustable transport speed, USB port control, Brush and suction delay timing, Speed-dependent water dosage, Intelligent Key permission management

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Stack Testers Friend free?

Stack Testers Friend is free to download, with no in-app purchases.

### Is Kärcher Machine connect free?

Kärcher Machine connect is free to download, with no in-app purchases.

### Do Stack Testers Friend or Kärcher Machine connect have ads?

Neither Stack Testers Friend nor Kärcher Machine connect shows ads.

### Which is updated more often, Stack Testers Friend or Kärcher Machine connect?

Stack Testers Friend ships an update every 7 months, and Kärcher Machine connect every 5 weeks. Most recently, Stack Testers Friend was updated on July 7, 2026 and Kärcher Machine connect on September 22, 2026.

---

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