# KEWPAT vs Stack Testers Friend

The clearest difference is review sentiment: Stack Testers Friend at 100% against KEWPAT's 35%. On price, update cadence, 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.

KEWPAT ships an update every 4 months, Stack Testers Friend every 7 months. The most recent releases landed on September 11, 2026 and July 7, 2026 respectively.

## The numbers

| Metric | KEWPAT | Stack Testers Friend |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 34.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 7 months |
| Monetization | Free | Free |
| Size | 12 MB | 33 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RSR Systems Ltd](https://appshunter.io/developer/1348350147) | [Lewis Holmes](https://appshunter.io/developer/1454834389) |

## What reviewers say

### KEWPAT

[App page](https://appshunter.io/ios/app/kewpat/id1348350148)

This app streamlines portable appliance testing (PAT) and test and tag procedures for iPhones and iPads. It allows manual logging of results, remote control of specific testers, and comprehensive data storage for multiple customers and sites. Users can customize fields, scan barcodes, and attach photos for detailed record-keeping.

**Highlights:** Manual PAT testing data logging, Remote control of Kewtech SMARTPAT, Import/export data with SimplyPats software, Barcode scanning for data entry, Photo capture with annotations, Customizable user-defined lists, Risk assessment tool for retest periods

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is KEWPAT free?

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

### Is Stack Testers Friend free?

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

### Do KEWPAT or Stack Testers Friend have ads?

Neither KEWPAT nor Stack Testers Friend shows ads.

### Which is updated more often, KEWPAT or Stack Testers Friend?

KEWPAT ships an update every 4 months, and Stack Testers Friend every 7 months. Most recently, KEWPAT was updated on September 11, 2026 and Stack Testers Friend on July 7, 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.*