# Trigonometry Formulas vs Trigonometry Hong Kong

The clearest difference is price: Trigonometry Hong Kong at Free against Trigonometry Formulas's $0.99. Trigonometry Formulas's advantage is update cadence (every 10 months vs every 34 months) and iOS requirement (13.0 vs 15.6). On rating, ratings volume, ads and in-app purchases there is nothing between them.

Trigonometry Hong Kong is free to download; Trigonometry Formulas costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Trigonometry Formulas against 5.0 for Trigonometry Hong Kong. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Trigonometry Formulas ships an update every 10 months, Trigonometry Hong Kong every 34 months. The most recent releases landed on October 2, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Trigonometry Formulas | Trigonometry Hong Kong |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/trigonometry-formulas/id1477059658/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/trigonometry-hong-kong/id1557131849/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 34 months |
| Monetization | Paid | **Free** |
| Size | 27 MB | 4 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ranjeet Kumar](https://appshunter.io/developer/1476822683) | [See Yan Wong](https://appshunter.io/developer/1453422332) |

## What reviewers say

### Trigonometry Formulas

[App page](https://appshunter.io/ios/app/trigonometry-formulas/id1477059658)

Access a comprehensive collection of trigonometry formulas, including ratios, functions, standard angle values, and identities. This app covers basic to advanced topics like inverse circular functions and properties of triangles, serving as a handy reference for students and enthusiasts.

**Highlights:** Trigonometric Ratios and Functions, Basic Trigonometric Formulas, Standard Angle Values, Quadrant Rules of Signs, Addition and Subtraction Formulas, Inverse Circular Functions, Properties of Triangles

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

**In-app purchases:** none


### Trigonometry Hong Kong

[App page](https://appshunter.io/ios/app/trigonometry-hong-kong/id1557131849)

This app provides a comprehensive guide to trigonometric formulas essential for Hong Kong university entrance exams. It covers a wide range of formulas, from basic sine and cosine to more advanced compound and subsidiary angle identities.

**Highlights:** Compound Angle Formulas, Subsidiary Angle Formulas, Double Angle Formulas, Triple Angle Formulas, Half Angle Formulas, Product-To-Sum Formulas, Sum-To-Product Formulas

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

**In-app purchases:** none


## Frequently asked questions

### Is Trigonometry Formulas free?

Trigonometry Formulas costs $0.99, with no in-app purchases.

### Is Trigonometry Hong Kong free?

Trigonometry Hong Kong is free to download, with no in-app purchases.

### Which has better reviews, Trigonometry Formulas or Trigonometry Hong Kong?

Trigonometry Formulas and Trigonometry Hong Kong are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Trigonometry Formulas or Trigonometry Hong Kong have ads?

Neither Trigonometry Formulas nor Trigonometry Hong Kong shows ads.

### Which is updated more often, Trigonometry Formulas or Trigonometry Hong Kong?

Trigonometry Formulas ships an update every 10 months, and Trigonometry Hong Kong every 34 months. Most recently, Trigonometry Formulas was updated on October 2, 2026 and Trigonometry Hong Kong on October 5, 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.*