# Trgnmtry vs Trigonometry Hong Kong

The clearest difference is rating: Trigonometry Hong Kong at 5.0 against Trgnmtry's 3.4. Trigonometry Hong Kong also leads on iOS requirement (15.6 vs 17.0). Trgnmtry's advantage is ratings volume (5 vs 1). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

Trigonometry Hong Kong holds the better App Store score, 5.0 against 3.4. That said, the two scores are not equally well evidenced: Trgnmtry has 5 ratings behind it against 1, so its average is the more settled of the two.

Trgnmtry ships an update every 21 months, Trigonometry Hong Kong every 34 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Trgnmtry | Trigonometry Hong Kong |
| --- | --- | --- |
| Price | — | **Free** |
| Rating | [3.4 (5 ratings)](https://appshunter.io/ios/app/trgnmtry/id1146667288/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/trigonometry-hong-kong/id1557131849/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 21 months** | Every 34 months |
| Monetization | Free | Free |
| Size | 5 MB | 4 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andrew McKnight](https://appshunter.io/developer/1888628988) | [See Yan Wong](https://appshunter.io/developer/1453422332) |

## What reviewers say

### Trgnmtry

[App page](https://appshunter.io/ios/app/trgnmtry/id1146667288)

Explore trigonometric relationships visually by interacting with a unit circle. Customize displayed measures and angle intervals for a dynamic learning experience. Adapts beautifully to both light and dark modes.

**Highlights:** Interactive unit circle, Visualize trigonometric measures, Customizable angle intervals, Supports light and dark mode, Geometric relation display

**Features:** macOS Compatibility

**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 Trgnmtry free?

Pricing for Trgnmtry is not currently listed on the App Store.

### Is Trigonometry Hong Kong free?

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

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

Trigonometry Hong Kong is rated higher. Trgnmtry averages 3.4 out of 5 from 5 ratings, while Trigonometry Hong Kong averages 5.0 from 1 ratings.

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

Neither Trgnmtry nor Trigonometry Hong Kong shows ads.

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

Trgnmtry ships an update every 21 months, and Trigonometry Hong Kong every 34 months. Most recently, Trgnmtry was updated on November 2, 2026 and Trigonometry Hong Kong on November 3, 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.*