# Trigonometric Equations vs Trigonometry Hong Kong

The clearest difference is price: Trigonometry Hong Kong at Free against Trigonometric Equations's $0.99. Trigonometric Equations's advantage is iOS requirement (9.0 vs 15.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

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

Trigonometric Equations ships an update every 20 months, Trigonometry Hong Kong every 34 months. The most recent releases landed on October 25, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Trigonometric Equations | Trigonometry Hong Kong |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/trigonometry-hong-kong/id1557131849/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 20 months** | Every 34 months |
| Monetization | — | Free |
| Size | 10 MB | 4 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FadiSoft Inc.](https://appshunter.io/developer/721334526) | [See Yan Wong](https://appshunter.io/developer/1453422332) |

## What reviewers say

### Trigonometric Equations

[App page](https://appshunter.io/ios/app/trigonometric-equations/id927622565)

**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 Trigonometric Equations free?

Trigonometric Equations 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.

### Do Trigonometric Equations or Trigonometry Hong Kong have ads?

Neither Trigonometric Equations nor Trigonometry Hong Kong shows ads.

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

Trigonometric Equations ships an update every 20 months, and Trigonometry Hong Kong every 34 months. Most recently, Trigonometric Equations was updated on October 25, 2026 and Trigonometry Hong Kong on October 21, 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.*