# Trigonometry Hong Kong vs Trig Function(Math Drills)

The clearest difference is update cadence: Trig Function(Math Drills) at every 4 days against Trigonometry Hong Kong's every 34 months. Trig Function(Math Drills) also leads on iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Trigonometry Hong Kong ships an update every 34 months, Trig Function(Math Drills) every 4 days. The most recent releases landed on October 5, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Trigonometry Hong Kong | Trig Function(Math Drills) |
| --- | --- | --- |
| Price | Free | 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 34 months | **Every 4 days** |
| Monetization | Free | Free |
| Size | 4 MB | 28 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [See Yan Wong](https://appshunter.io/developer/1453422332) | [郷 田村](https://appshunter.io/developer/1574588679) |

## What reviewers say

### 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


### Trig Function(Math Drills)

[App page](https://appshunter.io/ios/app/trig-functionmath-drills/id1670535500)

Practice trigonometric functions offline with automated question generation and correctness judgment. Review tips and answers, and compete in Challenge Mode to improve your rank. Ideal for students needing to master trigonometry.

**Highlights:** Offline learning, Automated question generation, Correctness judgment, Tips and answers, Challenge Mode, Rank improvement

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Trigonometry Hong Kong free?

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

### Is Trig Function(Math Drills) free?

Trig Function(Math Drills) is free to download, with no in-app purchases.

### Do Trigonometry Hong Kong or Trig Function(Math Drills) have ads?

Neither Trigonometry Hong Kong nor Trig Function(Math Drills) shows ads.

### Which is updated more often, Trigonometry Hong Kong or Trig Function(Math Drills)?

Trigonometry Hong Kong ships an update every 34 months, and Trig Function(Math Drills) every 4 days. Most recently, Trigonometry Hong Kong was updated on October 5, 2026 and Trig Function(Math Drills) on September 30, 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.*