# 河洛理數 vs 洋姑妈

The clearest difference is price: 洋姑妈 at Free against 河洛理數's $39.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

洋姑妈 is free to download; 河洛理數 costs $39.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | 河洛理數 | 洋姑妈 |
| --- | --- | --- |
| Price | $39.99 | **Free** |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 22 MB | 29 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [力千 肖](https://appshunter.io/developer/1475070901) | [Chengdu EasyTrans Technology Co.,Ltd.](https://appshunter.io/developer/1604350250) |

## What reviewers say

### 河洛理數

[App page](https://appshunter.io/ios/app/id1481221097)

**Features:** macOS Compatibility

**In-app purchases:** none


### 洋姑妈

[App page](https://appshunter.io/ios/app/id1623317021)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 河洛理數 free?

河洛理數 costs $39.99, with no in-app purchases.

### Is 洋姑妈 free?

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

### Do 河洛理數 or 洋姑妈 have ads?

Neither 河洛理數 nor 洋姑妈 shows ads.

### Which is updated more often, 河洛理數 or 洋姑妈?

河洛理數 ships an update every 2 months, and 洋姑妈 every 2 months. Most recently, 河洛理數 was updated on October 29, 2026 and 洋姑妈 on October 27, 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.*