# Trigonometry Help — Triangle Solver + Trig Calc

> Right-angled triangle solver with angle/side calculations and trig formulas. (iPhone/iPad app by Armchair Engineering.)

- Source: https://appshunter.io/ios/app/trigonometry-help/id411415648 (this page in markdown: same URL + `.md`)
- Developer: [Armchair Engineering](https://appshunter.io/developer/398901339)
- Category: Utilities, Education
- Price: $1.99 with in-app purchases
- Rating: 4.70/5 from 477 App Store ratings · 141 written reviews indexed
- Age rating: +4
- Requires: iOS 10.0 · 21 MB
- Languages: German (Germany), French (France), American English
- Released: 2010-12-23
- Data updated: 2026-09-07
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/trigonometry-help/id411415648/reviews.md

## What is Trigonometry Help?

Trig Help is a simple triangle calculator that enables you to quickly and easily find unknown angles & sides of any right-angled triangle. 

Features Include: 

- Accurately solve right-angled triangles
- Workings view, so you can see the math behind the solutions (requires optional upgrade)
- View a scale drawing of your solved triangle
- View a handy set of basic trig formulae
- Enter angles in radians, decimal degrees or degrees, minutes, seconds 
- Select your preferred number of decimal places

What two App Store reviewers had to say about Trig Help:

"I could never remember those simple formulas. I always had to dig out my text books from MANY YEARS ago to refresh my memory. THIS LITTLE APP IS A DELIGHT TO USE! I love it! Even my engineer friends are impressed. THANKS!" 5 Stars

"Easy to use and accurate with high degree of precision. Would recommend to any toolmaker." 5 Stars


Also available for OS X on the Mac App Store.

## Key features

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

## Pricing and in-app purchases

Base price: $1.99.

**One-time purchases**

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


## What do users think of Trigonometry Help?

Overall sentiment: positive

**Pros**

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

**Cons**

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

**Commonly reported bugs**

- Inconsistent performance on older devices
- Occasional crashes or freezes

**Most requested features**

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

## Recent user reviews (10 of 141)

All indexed reviews: https://appshunter.io/ios/app/trigonometry-help/id411415648/reviews.md

### 5/5 — Nickel

*2026-07-28*

5 
sur 5

### 5/5 — Wouldn’t be without this app

*2024-02-02*

For a builder or tradesman this is a great app. I have been using it for around 14 years for setting out concrete slabs, truss height when I know the roof pitch, I wouldn’t be without it and have recommended it to every tradie I work with. Great app, thank you so much.

### 5/5 — Up grade

*2022-02-17*

J’ai up-grad pas de changement 5,49$ ???

### 5/5 — Brilliant little app

*2019-10-05*

This app is a great tool to help you understand and get quick answers to right angled triangle problems.

### 5/5 — Excellent

*2019-09-11*

Excellent tools, fast, use friendly, recommended🍾

### 5/5 — Excellent tool

*2019-08-04*

I use this for carpentry. It’s the perfect tool to quickly find the angles and lengths you need!

### 5/5 — Love it

*2019-07-05*

I’m a Surveyor and should be able to do this in my sleep but with all the new tools I have lost some basic skills. This app is very simple and gets me TGE answer I need in a snap.

### 1/5 — Frechheit

*2019-03-15*

Schwachsinn, nur rechtwinklige dreiecke! Fuer den preis laecherlich

### 5/5 — Trig Help

*2019-01-24*

Couldn't ask for an easier to do math. When in school we had to show our work with no calculator. Love this app.

### 1/5 — I can’t believe I bought this based on reviews.

*2018-08-27*

These reviews are obviously fake. There is no way to calculate for cofunctions, tangents, you name it. It can only do basic calculations related to the Pythagorean theorem. This is definitely not a trigonometry app in the least. It’s worthless. I can’t believe I just paid for this garbage.

## Frequently asked questions about Trigonometry Help

### What does Trigonometry Help do?

Trigonometry Help is a calculator designed to quickly find unknown angles and sides of right-angled triangles. It offers features like a workings view to show the mathematical steps, a visual representation of the solved triangle, and a reference for essential trigonometric formulas.

### What are the key features of this app?

Key features include accurate solving of right-angled triangles, a detailed workings view (with an optional upgrade), a scale drawing of the solved triangle, a reference for basic trig formulas, support for various angle input formats (radians, decimal degrees, DMS), and the ability to select the number of decimal places for results.

### Is Trigonometry Help free to use?

The app is free to download and use for basic calculations. Some advanced features, such as the detailed workings view showing the math behind the solutions, require an optional in-app purchase to unlock.

### What devices is Trigonometry Help compatible with?

This application is available for mobile devices. A version for OS X is also available on the Mac App Store, indicating compatibility with Apple's desktop operating system.

### Who would benefit from using this app?

This app is beneficial for students learning trigonometry, engineers, toolmakers, and anyone who frequently needs to calculate angles and sides of right-angled triangles. Its ease of use and accuracy make it a valuable tool for both educational and practical purposes.

## Version history (last 5 releases)

### 4.0.5 — 2019-11-09

- Fixed floating keyboard bug, present on some devices running iOS 13

### 4.0.1 — 2019-01-29

- Bug fixes

### 4.0 — 2019-01-25

- Added workings view, so you can the math behind the solutions (optional upgrade)
- Support for newer, larger-screen iPhones
- Bug fixes

### 3.5 — 2017-10-06

- iOS 11 support
- Initial iPhone X support
- Fixed an issue that caused scale triangle not to be drawn on iPhone on iOS 10
- Bug fixes

### 3.0 — 2015-06-10

This version has been completely rewritten from the ground up and now includes:
- Support for iOS 8 & newer iPhones
- New modern theme option
- New keyboard theme settings
- Bug fixes
- Now requires iOS 6 or above

If you like this update and/or find Trig Help useful, please considering leaving a rating or review to help spread the word. Thanks for your support!

## Apps similar to Trigonometry Help

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Rule of Three Calculator](https://appshunter.io/ios/app/rule-of-three-calculator/id1185318300) | 2.3 (4) | Free | Utilities |
| [レコーダー - スピークバディ パーソナルコーチング](https://appshunter.io/ios/app/id1469874020) | — | Free | Utilities |
| [JEDA Live 職達](https://appshunter.io/ios/app/jeda-live/id1476523220) | — | Free | Utilities |
| [TLF Events Tamil](https://appshunter.io/ios/app/tlf-events-tamil/id1481109080) | — | Free | Utilities |
| [SSI Steel Design](https://appshunter.io/ios/app/ssi-steel-design/id1474838160) | 3.0 (1) | Free | Utilities |
| [小灵龙App](https://appshunter.io/ios/app/app/id1221738240) | 1.0 (12) | Free | Utilities |

## More apps by Armchair Engineering

- [Ohmulator](https://appshunter.io/ios/app/ohmulator/id398901336)
- [Fraction Help Calculator](https://appshunter.io/ios/app/fraction-help-calculator/id413490922)
- [Temperature Converter Classic](https://appshunter.io/ios/app/temperature-converter-classic/id417716278)
- [Student Timetable](https://appshunter.io/ios/app/student-timetable/id417962791)
- [Character Pad](https://appshunter.io/ios/app/character-pad/id418874651)

All apps by Armchair Engineering: https://appshunter.io/developer/398901339

## Related topics

[trigonometry help](https://appshunter.io/ios/topics/trigonometry-help) · [trigonometry help lite](https://appshunter.io/ios/topics/trigonometry-help-lite) · [trigonometry calc](https://appshunter.io/ios/topics/trigonometry-calc) · [trigonometry learn](https://appshunter.io/ios/topics/trigonometry-learn)

---

*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 2026-09-07.*