# Celsius® hollow section design vs Structura

The clearest difference is update cadence: Structura at every 10 days 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, Structura every 10 days. The most recent releases landed on September 27, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Celsius® hollow section design | Structura |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 10 days** |
| Monetization | Free | — |
| Size | 11 MB | 64 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) | [Greatcallie International Ltd](https://appshunter.io/developer/1144186123) |

## 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


### Structura

[App page](https://appshunter.io/ios/app/structura-structural-design/id6796137162)

**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 Structura free?

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

### Do Celsius® hollow section design or Structura have ads?

Neither Celsius® hollow section design nor Structura shows ads.

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

Celsius® hollow section design ships an update every 7 months, and Structura every 10 days. Most recently, Celsius® hollow section design was updated on September 27, 2026 and Structura on October 10, 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.*