# SCALE Structural Calculations vs iDrawlix Mobile

The clearest difference is update cadence: SCALE Structural Calculations at monthly against iDrawlix Mobile's every 10 months. SCALE Structural Calculations also leads on iOS requirement (12.0 vs 17.2). iDrawlix Mobile's advantage is device support (3 vs 1). On price, review sentiment, 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 iDrawlix Mobile sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

SCALE Structural Calculations ships an update monthly, iDrawlix Mobile every 10 months. The most recent releases landed on June 1, 2026 and July 7, 2026 respectively.

## The numbers

| Metric | SCALE Structural Calculations | iDrawlix Mobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/idrawlix-mobile/id1439486128/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 10 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 82 MB | 6 MB |
| Requires iOS | **12.0** | 17.2 |
| Devices | iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Fitzroy Systems Limited](https://appshunter.io/developer/1225174135) | [Studio Envisys](https://appshunter.io/developer/1279076741) |

## 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 |


### iDrawlix Mobile

[App page](https://appshunter.io/ios/app/idrawlix-mobile/id1439486128)

This app allows users to design and verify partially full conduits and open channels. It offers various cross-section types and hydraulic calculation models, displaying real-time flow depth and discharge. Users can also generate stage-discharge curves and analyze hydraulic grade lines.

**Highlights:** Playground concept for real-time experimentation, Seven cross-section types, Four hydraulic calculation models, International and Imperial unit systems, Real-time normal flow depth and discharge display, Stage-Discharge curve generation, Hydraulic Grade Line (HGL) representation

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Watermarks unlock forever. | $2.99 | one-time |
| Full unlock forever. | $5.99 | one-time |


## Frequently asked questions

### Is SCALE Structural Calculations free?

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

### Is iDrawlix Mobile free?

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

### Do SCALE Structural Calculations or iDrawlix Mobile have ads?

Neither SCALE Structural Calculations nor iDrawlix Mobile shows ads.

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

SCALE Structural Calculations ships an update monthly, and iDrawlix Mobile every 10 months. Most recently, SCALE Structural Calculations was updated on June 1, 2026 and iDrawlix Mobile 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.*