# Hollow_

> Hollow structure section design and validation tool for engineers. (iPhone/iPad app by Ardian Fauzy.)

- Source: https://appshunter.io/ios/app/hollow/id1191311638 (this page in markdown: same URL + `.md`)
- Developer: [Ardian Fauzy](https://appshunter.io/developer/1155916277)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 1.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.4 · 1 MB
- Languages: American English
- Released: 2017-01-16
- Data updated: 2026-06-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/hollow/id1191311638/reviews.md

## What is Hollow_?

Apps for design and validate unity check of Hollow Structure Section, unity check is the ratio between actual stress compare to allowable stress in accordance with Code and Standard.
AISC ASD 9th edition 1989 is used for the design.
User could customise section’s size and design parameter, the program have function to compile the Calculation Report and send it through email. Format of the Report is suitable for standard miscellaneous structure design calculation.
Two available option of design unit : kN-m or kips-ft, geometry size use millimetre or inch.
This program could be used for section’s properties calculator that include calculation of  torsion constant “J”, or weight calculator to estimate beam’s weight per length.

## Key features

- Hollow structure section design
- Unity check calculations
- Customizable section sizes
- Calculation report generation
- Section properties calculator
- Weight estimation

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| AISC 9th edition | $0.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/hollow/id1191311638/reviews.md

### 1/5 — Not working

*2023-04-11*

Will not change size of square tube, even after paying for app

## Frequently asked questions about Hollow_

### What design code does Hollow_ use?

Hollow_ uses the AISC ASD 9th edition 1989 for its design calculations. This standard is widely recognized for structural design.

### Can I customize the units in Hollow_?

Yes, Hollow_ offers two design unit options: kN-m or kips-ft. Geometry sizes can also be set in millimeters or inches.

### Does Hollow_ calculate section properties?

Yes, Hollow_ includes a function to act as a section properties calculator. It can compute the torsion constant 'J' and estimate beam weight per length.

### How does Hollow_ handle calculation reports?

The program compiles calculation reports in a format suitable for standard miscellaneous structure design. These reports can be sent via email directly from the app.

### What is the age rating for Hollow_?

Hollow_ has an age rating of 4+, making it suitable for a wide range of users. The app was last updated on May 3, 2024.

### What devices does Hollow_ support?

Currently, Hollow_ is supported on iPhone devices. The app was first released on January 16, 2017.

### Does Hollow_ have ads?

No, Hollow_ does not contain advertisements. The app is free to download and use, with optional in-app purchases.

### What is the user feedback on Hollow_?

Based on the available data, Hollow_ has received 1 rating with an average of 1.0 stars. This indicates a need for further user feedback and potential improvements.

## Version history (last 5 releases)

### 1.6 — 2024-05-03

Minor update

### 1.4 — 2021-01-05

Minor bug fixed.

### 1.3 — 2017-05-18

Remove Lite version's layer in the report.

### 1.2 — 2017-03-25

This is primarily a bug fix release.
Unit conversion improvement between metric and imperial, swipe gesture recognise and In App addition.
We hope you enjoy our app! and we’d be thrilled if you could leave some feedback in the App Store.

### 1.1 — 2017-01-20

This is primarily a bug fix release.

## More apps by Ardian Fauzy

- [WideFlange](https://appshunter.io/ios/app/wideflange/id1191244770)
- [Channel_](https://appshunter.io/ios/app/channel/id1191259917)
- [Boxup_](https://appshunter.io/ios/app/boxup/id1191284981)
- [KingCross](https://appshunter.io/ios/app/kingcross/id1191315893)
- [QueenCross](https://appshunter.io/ios/app/queencross/id1191315899)

All apps by Ardian Fauzy: https://appshunter.io/developer/1155916277

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*