Comparison

Stack Testers Friend vs Kärcher Machine connect

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Stack Testers Friend

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
Read full description

The app has been developed by the Engineers of CES Environmental Instruments, one of the UKs leading environmental Test Houses and incorporates some of their on-site calculations in one easy to use app. When working on the stack and you need that quick answer to a gas conversion or probe position, the answer can be at your fingertips. Simple and easy to use the app contains lots of essential calculations for the stack tester without the need to manually calculate the value or start up a laptop. The app is an essential tool for the professional Environmental engineer having all the tools to quickly check the numbers whilst out and around site. The contents of the CES Environmental Instruments popular Engineers Note Book is preloaded within the app. The app can do the following and much more: - Calculate Dia, CSA, Circ. - Isokinetic sample positions, General & Tangential - Extraction rates - Gas density - Calculate H20 from wet & dry Oxygen - Gas ppm/mg/m³ conversions & Normalisation - LOD - Particulate Matter Normalisation & estimation of temp, H2O & O2 - Ranging & scaling of dust monitors & outputs - Calculation of values using calibration functions - Biomass fuels

About

Kärcher Machine connect

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
Read full description

Innovate your way of floor cleaning Get full control of your scrubber drier! Machine Connect smartifies your machine and grants you manifold additional functions, adjustments and information. These are for example: - set the machine display language - set the type of cleaning head - set the maximum transport speed - turn off/on the USB port - set the delay time of the brush(es) - set the delay time of the suction - turn on/off the speed-dependent water dosage - manage the permissions of the yellow Intelligent Key - restore factory settings - get instruction, care and troubleshooting advice

Screenshots

Stack Testers Friend4 screens
Kärcher Machine connect4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
Stack Testers Friend versus Kärcher Machine connect: the parameters behind the verdict, then further details
ParameterStack Testers FriendKärcher Machine connect
PriceFreeFree
Rating—5.0 (8 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings—8 — better
Update frequencyEvery 7 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.1
Further details — not scored
Size33 MB101 MB
Age rating4+4+
DeveloperLewis HolmesAlfred Kaercher SE & Co. KG

Customer experience

Stack Testers Friend

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Kärcher Machine connect

All ratings8 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Stack Testers Friend

No in-app purchases

None

Kärcher Machine connect

No in-app purchases

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.

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