# Graycode vs SSI Steel Design

Graycode and SSI Steel Design both sit at 3.0 stars, but that hides the real split: 67% of Graycode's written reviews are positive against 0% of SSI Steel Design's. Graycode also leads on in-app purchases (none vs 1) and device support (3 vs 1). SSI Steel Design's advantage is price (Free vs $2.99) and update cadence (every 3 months vs every 10 months). On rating, ratings volume and ads there is nothing between them.

SSI Steel Design is free to download; Graycode costs $2.99 up front. SSI Steel Design sells 1 one-off in-app purchase. Graycode asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.0 for Graycode against 3.0 for SSI Steel Design. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews are what separate them: 67% of Graycode's written reviews are positive against 0% of SSI Steel Design's.

Graycode ships an update every 10 months, SSI Steel Design every 3 months. The most recent releases landed on August 26, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Graycode | SSI Steel Design |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/graycode/id548428653/reviews) | [3.0 (1 ratings)](https://appshunter.io/ios/app/ssi-steel-design/id1474838160/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Size | 2 MB | 23 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) | [Sahaviriya Steel Industries Public Company Limited](https://appshunter.io/developer/1474838159) |

## What reviewers say

### Graycode

[App page](https://appshunter.io/ios/app/graycode/id548428653)

This utility converts numbers between decimal, hexadecimal, binary, and Gray code formats. Changes to one value automatically update the others, making it a convenient tool for engineers. It also features an animated demonstration of the Tower of Hanoi puzzle.

**Highlights:** Decimal, hex, binary, Gray code conversion, Real-time updates, Handy calculator for engineers, Animated Tower of Hanoi solution, Supports iPhone, iPad, iPod

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

**In-app purchases:** none


### SSI Steel Design

[App page](https://appshunter.io/ios/app/ssi-steel-design/id1474838160)

Easily determine the capacity of structural steel beams and columns. Get detailed calculation sheets to verify your work, designed according to AISC 360-16 standards. Features intuitive touch-based interaction and built-in material databases.

**Highlights:** Determine steel beam and column capacity, Generate detailed calculation sheets, Intuitive touch-based design input, Supports AISC 360-16 standards, Built-in material databases, Saves calculation sheets as JPG

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Report Sheet | $12.99 | one-time |


## Frequently asked questions

### Is Graycode free?

Graycode costs $2.99, with no in-app purchases.

### Is SSI Steel Design free?

SSI Steel Design is free to download, with in-app purchases available.

### Which has better reviews, Graycode or SSI Steel Design?

Graycode and SSI Steel Design are both rated 3.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Graycode or SSI Steel Design have ads?

Neither Graycode nor SSI Steel Design shows ads.

### Which is updated more often, Graycode or SSI Steel Design?

Graycode ships an update every 10 months, and SSI Steel Design every 3 months. Most recently, Graycode was updated on August 26, 2026 and SSI Steel Design on September 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.*