# Trigonometry Help Lite — Triangle Calculator + Workings

> Right-angled triangle calculator with detailed workings and visual representations. (iPhone/iPad app by Armchair Engineering.)

- Source: https://appshunter.io/ios/app/trigonometry-help-lite/id1465685523 (this page in markdown: same URL + `.md`)
- Developer: [Armchair Engineering](https://appshunter.io/developer/398901339)
- Category: Education, Utilities
- Price: Free with in-app purchases
- Rating: 4.70/5 from 768 App Store ratings · 16 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 17 MB
- Languages: French (France), German (Germany), American English
- Released: 2019-06-02
- Data updated: 2026-08-28
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/trigonometry-help-lite/id1465685523/reviews.md

## What is Trigonometry Help Lite?

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 macOS on the Mac App Store.

## Key features

- Solve right-angled triangles
- View detailed math workings
- Scale drawing of solved triangle
- Basic trig formulae reference
- Multiple angle input formats
- Customizable decimal places

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Trig Help Premium | $3.99 | one-time |
| Trig Help Premium | $2.99 | one-time |
| Trig Help Premium | $5.99 | one-time |


## What do users think of Trigonometry Help Lite?

Overall sentiment: positive

**Pros**

- 👍 Simple and intuitive user interface
- 🚀 Quick and fast calculations
- 💼 Practical for professional use (construction, surveying)
- ✅ Reliable and doesn't crash
- 📚 Helpful for learning trigonometry
- 🎯 Straight-to-the-point functionality
- ✔️ Accurate results for basic calculations

**Cons**

- 💰 Unclear upgrade value proposition
- 📊 Limited decimal place precision in free version
- 🔍 Insufficient feature differentiation between tiers
- ⚠️ Calculation accuracy issues reported

**Commonly reported bugs**

- Incorrect calculation results in some cases

**Most requested features**

- Better visual representation of triangles
- Clearer explanation of premium features
- Higher default decimal place precision
- More detailed feature descriptions for paid tiers

## Recent user reviews (10 of 16)

All indexed reviews: https://appshunter.io/ios/app/trigonometry-help-lite/id1465685523/reviews.md

### 5/5 — 👍👍

*2026-06-29*

Quick and simple!

### 5/5 — Fantastic

*2025-11-16*

Super helpful and awesome in its simplicity.

### 5/5 — Very simple to use!

*2025-04-09*

This app is very simple, hence very enjoyable, to use.  Just plug in a couple of pieces of information and you get the answer you seek.

### 5/5 — Calcul d’angle

*2024-09-05*

Super pratique et facile à prendre en main

### 5/5 — Survey math.

*2024-07-15*

Quick and easy way to find distance and angles!!

### 5/5 — So useful

*2024-01-02*

Quick answers for a busy man! Thank you!

### 5/5 — Handy tool!

*2023-07-21*

Great little app for quick and easy Trig calculations. Roof pitches etc.

### 3/5 — Very Unclear Upgrade Options

*2023-07-12*

There are several options for upgrade! But nothing at all to identify a single additional feature, other than how many decimal places are added beyond 0.9. You want my money, give me a slightly better reason for why I should gov it to you, rather than another app that gives me a better representation of the triangle. There are others apps that are free and give you 10 decimal places automatically. 

This app will help you with basic trig. There are better ones out there for free. So you go into the scrap app pile!

### 1/5 — Wrong result

*2022-12-22*

Very poor to think the app can not do basic calculation correctly

### 5/5 — Work

*2022-04-30*

I build hand rails every day and I use this app for my angles when drawing out 
Thanks to this app it saves me the time to work everything out 
Plus it’s a good cross reference to double check my work 
Doesn’t crash 
And very reliable

## Frequently asked questions about Trigonometry Help Lite

### What does Trigonometry Help Lite do?

Trigonometry Help Lite is a triangle calculator designed to quickly and easily find unknown angles and sides of any right-angled triangle. It provides accurate solutions, a view of the mathematical workings (with an upgrade), and a scale drawing of the solved triangle.

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

Key features include accurate solving of right-angled triangles, a workings view to see the math behind solutions, a scale drawing of the triangle, a reference of basic trig formulas, and the ability to enter angles in various formats (radians, decimal degrees, degrees/minutes/seconds) with customizable decimal places.

### Is Trigonometry Help Lite free to use?

The app is free to download and use for basic calculations. However, the 'Workings view' feature, which shows the detailed math behind the solutions, requires an optional upgrade purchase.

### What devices is Trigonometry Help Lite compatible with?

This app is available for mobile devices. A version is also available for macOS on the Mac App Store, indicating compatibility with Apple's operating systems.

### Who would find this app useful?

This app is useful for students learning trigonometry, engineers, toolmakers, or anyone who frequently needs to solve problems involving right-angled triangles. It simplifies recalling and applying trigonometric formulas.

## Version history (last 5 releases)

### 4.0.6 — 2019-12-06

- Bug fixes

### 4.0.5 — 2019-11-09

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

### 4.0.4 — 2019-08-01

- Bug fixes
- Minor UI tweaks

### 4.0.3 — 2019-06-03

- Bug fixes

### 4.0.2 — 2019-06-02

No release notes.

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## More apps by Armchair Engineering

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

## Related topics

[trigonometry calculator](https://appshunter.io/ios/topics/trigonometry-calculator) · [trigonometry](https://appshunter.io/ios/topics/trigonometry) · [triangle calculator](https://appshunter.io/ios/topics/triangle-calculator) · [isosceles triangle pro](https://appshunter.io/ios/topics/isosceles-triangle-pro)

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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 2026-08-28.*