# SCALE Structural Calculations vs SignalKind

The clearest difference is iOS requirement: SCALE Structural Calculations at 12.0 against SignalKind's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. SCALE Structural Calculations sells 2 in-app purchases, starting at $50.99 per month and SignalKind sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

SCALE Structural Calculations ships an update monthly, SignalKind every 2 months. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | SCALE Structural Calculations | SignalKind |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 82 MB | 17 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 12+ |
| Developer | [Fitzroy Systems Limited](https://appshunter.io/developer/1225174135) | [ASHLEY DRURY](https://appshunter.io/developer/1880749523) |

## What reviewers say

### SCALE Structural Calculations

[App page](https://appshunter.io/ios/app/scale-structural-calculations/id1225174136)

This app provides structural engineers with tools to perform calculations and generate component details for various structural elements. It offers a comprehensive library of proformas and expert systems for reinforced concrete, steelwork, timber, and masonry detailing, supporting both Eurocodes and British Standards.

**Highlights:** Structural calculations for beams, columns, slabs, Component detailing for steel, concrete, masonry, timber, Library of over 600 proforma calculations, Expert systems for detailing (LUCID, SPADE), 2D/3D elastic analysis (NL-STRESS), PDF and DOCX output for submission, Support for Eurocodes and British Standards

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full subscription to SCALE | $50.99 | per month |
| Full subscription to SCALE | $299.99 | per year |


### SignalKind

[App page](https://appshunter.io/ios/app/signalkind/id6759801457)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription for 1 Month | $2.99 | per month |
| 1 Year Subscription (12 Months) | $19.99 | per year |


## Frequently asked questions

### Is SCALE Structural Calculations free?

SCALE Structural Calculations is free to download, with in-app purchases available.

### Is SignalKind free?

SignalKind is free to download, with in-app purchases available.

### Do SCALE Structural Calculations or SignalKind have ads?

Neither SCALE Structural Calculations nor SignalKind shows ads.

### Which is updated more often, SCALE Structural Calculations or SignalKind?

SCALE Structural Calculations ships an update monthly, and SignalKind every 2 months. Most recently, SCALE Structural Calculations was updated on October 7, 2026 and SignalKind on October 14, 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.*