# QI Calculator vs Wave Yeung

The clearest difference is in-app purchases: Wave Yeung at none against QI Calculator's 2. QI Calculator's advantage is device support and iOS requirement (15.0 vs 17.5). On price there is nothing between them.

Both are free to download. QI Calculator sells 2 one-off in-app purchases. Wave Yeung asks for nothing beyond the download.

## The numbers

| Metric | QI Calculator | Wave Yeung |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | Every 3 weeks | — |
| Size | 129 MB | 1 MB |
| Requires iOS | **15.0** | 17.5 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 17+ |
| Developer | [shouhui qi](https://appshunter.io/developer/1185710456) | [Hei Yin Fong](https://appshunter.io/developer/1550555061) |

## What reviewers say

### QI Calculator

[App page](https://appshunter.io/ios/app/qi-calculator/id6476379861)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Theme | $0.99 | one-time |
| Theme Blue Sky | $0.99 | one-time |


### Wave Yeung

[App page](https://appshunter.io/ios/app/wave-yeung/id6529534365)

**In-app purchases:** none


## Frequently asked questions

### Is QI Calculator free?

QI Calculator is free to download, with in-app purchases available.

### Is Wave Yeung free?

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

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*