# HKUSI vs DOUBLE COAST

The clearest difference is update cadence: HKUSI at every 4 months against DOUBLE COAST's every 10 months. HKUSI also leads on iOS requirement (14.0 vs 16.4). On price, ads, in-app purchases and device support there is nothing between them.

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

HKUSI ships an update every 4 months, DOUBLE COAST every 10 months. The most recent releases landed on October 8, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | HKUSI | DOUBLE COAST |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 10 months |
| Size | 14 MB | 68 MB |
| Requires iOS | **14.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [The University of Hong Kong](https://appshunter.io/developer/451384643) | [Innowave Solutions Limited](https://appshunter.io/developer/1560929775) |

## What reviewers say

### HKUSI

[App page](https://appshunter.io/ios/app/hkusi/id6451187307)

**Features:** macOS Compatibility

**In-app purchases:** none


### DOUBLE COAST

[App page](https://appshunter.io/ios/app/double-coast/id6737324536)

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

**In-app purchases:** none


## Frequently asked questions

### Is HKUSI free?

HKUSI is free to download, with no in-app purchases.

### Is DOUBLE COAST free?

DOUBLE COAST is free to download, with no in-app purchases.

### Do HKUSI or DOUBLE COAST have ads?

Neither HKUSI nor DOUBLE COAST shows ads.

### Which is updated more often, HKUSI or DOUBLE COAST?

HKUSI ships an update every 4 months, and DOUBLE COAST every 10 months. Most recently, HKUSI was updated on October 8, 2026 and DOUBLE COAST on November 4, 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.*