# Trigonometry Help vs SSI Steel Design

The clearest difference is price: SSI Steel Design at Free against Trigonometry Help's $1.99. SSI Steel Design also leads on update cadence (every 3 months vs every 13 months). Trigonometry Help's advantage is rating (4.7 vs 3.0) and review sentiment (91% vs 50%). On ads and in-app purchases there is nothing between them.

SSI Steel Design is free to download; Trigonometry Help costs $1.99 up front. Trigonometry Help sells 3 one-off in-app purchases and SSI Steel Design sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Trigonometry Help holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Trigonometry Help has 481 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 91% of Trigonometry Help's written reviews are positive against 50% of SSI Steel Design's.

Trigonometry Help ships an update every 13 months, SSI Steel Design every 3 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Trigonometry Help | SSI Steel Design |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.7 (481 ratings)](https://appshunter.io/ios/app/trigonometry-help/id411415648/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/ssi-steel-design/id1474838160/reviews) |
| Number of ratings | **481** | 1 |
| Positive reviews | **91.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 3 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 21 MB | 23 MB |
| Requires iOS | **10.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | +4 | 4+ |
| Developer | [Armchair Engineering](https://appshunter.io/developer/398901339) | [Sahaviriya Steel Industries Public Company Limited](https://appshunter.io/developer/1474838159) |

## What reviewers say

### Trigonometry Help

[App page](https://appshunter.io/ios/app/trigonometry-help/id411415648)

This app helps you quickly solve for unknown angles and sides of right-angled triangles. It provides a workings view for understanding the math, a scale drawing of the triangle, and a reference for basic trigonometric formulas. You can input angles in various formats and choose your desired decimal precision.

**Highlights:** Solve right-angled triangles, Workings view for solutions, Scale drawing of solved triangle, Basic trig formulae reference, Multiple angle input formats, Customizable decimal places

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Trig Help Premium | $0.99 | one-time |
| Trig Help Premium | $1.99 | one-time |
| Trig Help Premium | $3.99 | one-time |

**What reviewers like**

- 🚀 Quick and easy to use
- 👍 User-friendly interface
- 🔧 Helpful for tradesmen and professionals
- ⚙️ Accurate calculations
- 🔍 Convenient for on-site use

**What reviewers complain about**

- 🔢 Limited to right-angled triangles only
- 🔍 Lacks advanced trig functions
- 🔀 No option to rotate/flip the triangle view

**Reported bugs**

- Inconsistent performance on older devices
- Occasional crashes or freezes

**Requested features**

- Support for irregular triangles
- Ability to show step-by-step workings
- Option to switch between degrees/minutes/seconds and decimal values


### 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 Trigonometry Help free?

Trigonometry Help costs $1.99, and also offers in-app purchases.

### Is SSI Steel Design free?

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

### Which has better reviews, Trigonometry Help or SSI Steel Design?

Trigonometry Help is rated higher. Trigonometry Help averages 4.7 out of 5 from 481 ratings, while SSI Steel Design averages 3.0 from 1 ratings.

### Do Trigonometry Help or SSI Steel Design have ads?

Neither Trigonometry Help nor SSI Steel Design shows ads.

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

Trigonometry Help ships an update every 13 months, and SSI Steel Design every 3 months. Most recently, Trigonometry Help was updated on November 6, 2026 and SSI Steel Design on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*