# Stack Testers Friend vs PATMobile

The clearest difference is review sentiment: Stack Testers Friend at 100% against PATMobile's 9%. Stack Testers Friend also leads on update cadence (every 7 months vs every 28 months) and device support (3 vs 1). On price, ads, in-app purchases and monetization model 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, PATMobile every 28 months. The most recent releases landed on September 24, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Stack Testers Friend | PATMobile |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **100.0% of reviews** | 8.9% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 28 months |
| Monetization | Free | Free |
| Size | 33 MB | 134 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Lewis Holmes](https://appshunter.io/developer/1454834389) | [Seaward Electronics Ltd.](https://appshunter.io/developer/918496392) |

## 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


### PATMobile

[App page](https://appshunter.io/ios/app/patmobile/id1495978467)

Easily record and manage your electrical appliance test results on your smartphone. Generate professional PDF reports instantly or display records on-site. Designed for seamless integration with specific testing equipment.

**Highlights:** Record PAT test results, Scan barcodes, Take photos, Store test results, Print labels, Generate PDF reports

**Features:** macOS Compatibility, 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 PATMobile free?

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

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

Neither Stack Testers Friend nor PATMobile shows ads.

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

Stack Testers Friend ships an update every 7 months, and PATMobile every 28 months. Most recently, Stack Testers Friend was updated on September 24, 2026 and PATMobile on October 8, 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.*