# Celsius® hollow section design vs Steel Sections

The clearest difference is update cadence: Steel Sections at every 3 months against Celsius® hollow section design's every 7 months. Celsius® hollow section design's advantage is iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Celsius® hollow section design ships an update every 7 months, Steel Sections every 3 months. The most recent releases landed on October 13, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Celsius® hollow section design | Steel Sections |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 11 MB | 63 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tata Steel IJmuiden B.V.](https://appshunter.io/developer/1346513780) | [Fondazione Promozione Acciaio](https://appshunter.io/developer/1643729899) |

## What reviewers say

### Celsius® hollow section design

[App page](https://appshunter.io/ios/app/celsius-hollow-section-design/id1484496183)

This app assists structural engineers in selecting the optimal hollow section size based on design load conditions and buckling length. It calculates and lists suitable sections from a comprehensive range, providing key information like efficiency factor and mass per meter. Users can filter results by size, utilization, embodied CO₂, or weight, and share selections via email or messaging.

**Highlights:** Calculate section size based on axial load and buckling length, Select sections for members in bending, List sections with efficiency factor and mass per meter, Filter results by size, utilization, CO₂, or weight, Classify sections by UK market availability, Share selected sections via email or messaging

**In-app purchases:** none


### Steel Sections

[App page](https://appshunter.io/ios/app/steel-sections/id1643729897)

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

**In-app purchases:** none


## Frequently asked questions

### Is Celsius® hollow section design free?

Celsius® hollow section design is free to download, with no in-app purchases.

### Is Steel Sections free?

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

### Do Celsius® hollow section design or Steel Sections have ads?

Neither Celsius® hollow section design nor Steel Sections shows ads.

### Which is updated more often, Celsius® hollow section design or Steel Sections?

Celsius® hollow section design ships an update every 7 months, and Steel Sections every 3 months. Most recently, Celsius® hollow section design was updated on October 13, 2026 and Steel Sections on October 25, 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.*