# CASA Space Frame 3D vs Stack Testers Friend

The clearest difference is price: Stack Testers Friend at Free against CASA Space Frame 3D's $299.99. CASA Space Frame 3D's advantage is update cadence (every 3 months vs every 7 months). On review sentiment, ads, in-app purchases and device support there is nothing between them.

Stack Testers Friend is free to download; CASA Space Frame 3D costs $299.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CASA Space Frame 3D ships an update every 3 months, Stack Testers Friend every 7 months. The most recent releases landed on June 9, 2026 and July 7, 2026 respectively.

## The numbers

| Metric | CASA Space Frame 3D | Stack Testers Friend |
| --- | --- | --- |
| Price | $299.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/casa-space-frame-3d/id371089612/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 7 months |
| Monetization | Paid | **Free** |
| Size | 6 MB | 33 MB |
| Requires iOS | 14.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Intesym Ltd.](https://appshunter.io/developer/361434891) | [Lewis Holmes](https://appshunter.io/developer/1454834389) |

## What reviewers say

### CASA Space Frame 3D

[App page](https://appshunter.io/ios/app/casa-space-frame-3d/id371089612)

This app enables structural engineers to perform static and dynamic elastic analysis of 3D space-frames. It offers quick and precise modeling with graphical interaction, providing numerical and graphical results for deflections, forces, and mode shapes.

**Highlights:** Linear static analysis, Non-linear static analysis (P-Delta), Dynamic analysis (natural modes, footfall), Extensive section and material libraries, Graphical interactive results, Metric & imperial units

**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 CASA Space Frame 3D free?

CASA Space Frame 3D costs $299.99, with no in-app purchases.

### Is Stack Testers Friend free?

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

### Do CASA Space Frame 3D or Stack Testers Friend have ads?

Neither CASA Space Frame 3D nor Stack Testers Friend shows ads.

### Which is updated more often, CASA Space Frame 3D or Stack Testers Friend?

CASA Space Frame 3D ships an update every 3 months, and Stack Testers Friend every 7 months. Most recently, CASA Space Frame 3D was updated on June 9, 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.*