# Trigonometry! — trigonometry

> Comprehensive trigonometry learning app with textbook, formulas, and video lessons. (iPhone/iPad app by AppCrab.)

- Source: https://appshunter.io/ios/app/trigonometry/id1236663817 (this page in markdown: same URL + `.md`)
- Developer: [AppCrab](https://appshunter.io/developer/1227198215)
- Category: Education, Reference
- Price: Free with in-app purchases
- Rating: 2.00/5 from 4 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 29 MB
- Languages: American English
- Released: 2017-06-06
- Data updated: 2026-06-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/trigonometry/id1236663817/reviews.md

## What is Trigonometry!?

Are your trigonometry exam at the corner? Our app will rescue you!

"Trigonometry" is your personal helper that provides you with all information required. Can you just imagine that with the help of one mobile app you can easily learn trig reviewing the textbook provided, observing visual explanations and watching video lessons?!

Downloading our app you get:

▶ FORMULAS

• Ordered set of basic formulas and theorems that can only be applied in the frameworks of this course
• Needed comments and explanations are given

▶ 172 VIDEO LESSONS

▶ TEXTBOOK

• It covers major topics
• Textbook is easy-to-read and easy-to-understand
• The book divided into:
- Right Triangle Trigonometry
- Angles
- Trigonometric Functions of an Acute Angle
- Applications and Solving Right Triangles
- Trigonometric Functions of Any Angle
- Rotations and Reflections of Angles
- General Triangles
- The Law of Sines
- The Law of Cosines
- The Law of Tangents
- The Area of a Triangle
- Circumscribed and Inscribed Circles
- Identities
- Trigonometric Identities
- Sum and Difference Formulas
- Double-Angle and Half-Angle Formulas
- Other Identities
- Radian Measure
- Radians and Degrees
- Arc Length
- Area of a Sector
- Circular Motion: Linear and Angular Speed
- Graphing and Inverse Functions
- Graphing the Trigonometric Functions
- Properties of Graphs of Trigonometric Functions
- Inverse Trigonometric Functions
- Solving Trigonometric Equations
- Numerical Methods in Trigonometry
- Complex Numbers
- Polar Coordinates


Stop being scared, download "Trigonometry"!

## Key features

- Ordered set of basic formulas and theorems
- 172 video lessons
- Easy-to-read and understand textbook
- Covers major trigonometry topics
- Visual explanations

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Trigonometry Premium | $0.99 | one-time |


## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/trigonometry/id1236663817/reviews.md

### 1/5 — Videos will not play

*2020-12-03*

The videos on the app will not play. No information on how to fix it. Please fix this bug. It was identified a year ago, it seems. I would really love to use the app

### 1/5 — Apple & this developer are greedy.

*2020-05-23*

DO NOT BUY THIS APP BECAUSE ALL VIDEOS ABOUT TRIGONOMETRY DO NOT WORK. 

THIS APP SHOULD NOT EVEN BE ADVERTISED IN THE APP STORE. 

THE FACT THAT IT CONTINUES TO BE SHOWN IS A TRIBUTE TO THE UNMITIGATED GREED OF APPLE AND THE DEVELOPER OF THIS SHAM OF AN APP. 

I REPEAT MY WARNING TO EVERY PETSON THAT BUYING THIS APP WILL LEAD TO THE TOTAL LOSS OF YOUR MONEY.

### 5/5 — Amazing App

*2020-01-13, version 1.0.3*

Helped me a lot. It keeps all trigonometry formulas in 1 place.

### 1/5 — Smacks of being an unfinished project

*2019-11-08, version 1.0.3*

Sadly this looks to be an unfinished project by the maker. Shame as the app clearly references 172 videos but when you click on any of these videos you receive a message “video can’t be played”. I’d guess this is something in the coding rather than the video availability.

Secondly, as previously mentioned in other comments, there simply is no text book. I find this baffling as that is probably the main selling point of the app (as in, that is the part of the app pushed hardest in the description). Is this what you get access to if you pay to go ad free? (Incidentally, there are no ads just to confuse matters further).

Thirdly, little things like html Code being left in the authors description paint a picture of either a project that was forgotten/abandoned or just laziness. It looks to be a one man operation and kudos to him for the effort but sadly the app should be pulled as it stands due to the above issues.

Sad as the hardest part (recording the hours and hours of maths) has been done. Good luck to the app author. I hope you return to finish this one day.

### 1/5 — Videos will not play

*2019-06-20*

Not sure why. I’ve deleted the app and Redownloaded the app and they won’t play

### 1/5 — Rubbish

*2019-03-17, version 1.0.3*

App ad states there is a text book. There isn’t. Videos have no sound! Once you go into premium formulas Unable to go back into any previous page. All in all rubbish.

### 1/5 — Not working

*2018-10-16, version 1.0.3*

Video can’t be played error.

## Frequently asked questions about Trigonometry!

### What topics does Trigonometry! cover?

Trigonometry! covers a wide range of topics including Right Triangle Trigonometry, Angles, Trigonometric Functions, General Triangles, Identities, Radian Measure, Graphing, and Complex Numbers.

### How does Trigonometry! help with learning?

Trigonometry! provides a textbook, ordered sets of basic formulas with explanations, and 172 video lessons to aid in understanding and reviewing concepts.

### What is the learning methodology of Trigonometry!?

The app uses a multi-modal approach combining textual explanations from its textbook, visual aids, and video lessons to cater to different learning styles.

### Does Trigonometry! offer progress tracking?

The provided data does not specify if Trigonometry! offers explicit progress tracking features. It focuses on delivering comprehensive learning materials.

### Is Trigonometry! available on Android?

Trigonometry! is currently supported on iPhone, iPad, and iPod, as indicated by the supported devices list. Android compatibility is not mentioned.

### How often is Trigonometry! updated?

The app was last updated on August 27, 2018, with version 1.0.3. Further update frequency information is not available.

### What is the user sentiment for Trigonometry!?

Trigonometry! has a rating of 2.0 stars from 4 ratings, suggesting a mixed to negative user sentiment based on the limited feedback available.

### Does Trigonometry! have ads?

No, Trigonometry! does not contain advertisements. The app is free to download and use without ad interruptions.

## Version history (last 4 releases)

### 1.0.3 — 2018-08-27

This app has been updated by Apple to display the Apple Watch app icon.

Bug fixes

### 1.0.2 — 2018-08-15

Bug fixes

### 1.0.0 — 2017-09-19

Fixed In-App Purchases.

### 1.0 — 2017-06-06

No release notes.

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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 2026-06-04.*