# SCALE Structural Calculations vs PROG

The clearest difference is update cadence: PROG at every 3 days against SCALE Structural Calculations's monthly. PROG also leads on device support (3 vs 1). SCALE Structural Calculations's advantage is iOS requirement (12.0 vs 15.1). On price, 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 PROG sells 4 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

SCALE Structural Calculations ships an update monthly, PROG every 3 days. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | SCALE Structural Calculations | PROG |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 82 MB | 51 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Fitzroy Systems Limited](https://appshunter.io/developer/1225174135) | [Ono-michi](https://appshunter.io/developer/1895054153) |

## 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 |


### PROG

[App page](https://appshunter.io/ios/app/prog-project-planner/id6762875573)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Paid Monthly Subscription | $9.99 | per month |
| Pro Monthly | $22.99 | per month |
| Paid Annual Subscription | $119.99 | per year |
| Pro Annual Subscription | $229.99 | per year |


## Frequently asked questions

### Is SCALE Structural Calculations free?

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

### Is PROG free?

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

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

Neither SCALE Structural Calculations nor PROG shows ads.

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

SCALE Structural Calculations ships an update monthly, and PROG every 3 days. Most recently, SCALE Structural Calculations was updated on November 2, 2026 and PROG on November 5, 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.*