# USB vs 康軒AR四季星空

The clearest difference is update cadence: USB at every 3 months against 康軒AR四季星空's every 42 months. 康軒AR四季星空's advantage is iOS requirement (11.0 vs 13.0). 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.

USB ships an update every 3 months, 康軒AR四季星空 every 42 months. The most recent releases landed on August 18, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | USB | 康軒AR四季星空 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 42 months |
| Size | 201 MB | 160 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Merry-Link Co.,Ltd.](https://appshunter.io/developer/1040729128) | [康軒文教事業](https://appshunter.io/developer/431546873) |

## What reviewers say

### USB

[App page](https://appshunter.io/ios/app/usb-921/id1539400908)

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

**In-app purchases:** none


### 康軒AR四季星空

[App page](https://appshunter.io/ios/app/ar/id1585483774)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is USB free?

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

### Is 康軒AR四季星空 free?

康軒AR四季星空 is free to download, with no in-app purchases.

### Do USB or 康軒AR四季星空 have ads?

Neither USB nor 康軒AR四季星空 shows ads.

### Which is updated more often, USB or 康軒AR四季星空?

USB ships an update every 3 months, and 康軒AR四季星空 every 42 months. Most recently, USB was updated on August 18, 2026 and 康軒AR四季星空 on September 20, 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.*