# 幸運球 vs RainbowSky

The clearest difference is update cadence: RainbowSky at every 2 weeks against 幸運球's every 36 months. 幸運球's advantage is iOS requirement (6.0 vs 12.0). 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.

幸運球 ships an update every 36 months, RainbowSky every 2 weeks. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | 幸運球 | RainbowSky |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 36 months | **Every 2 weeks** |
| Size | 24 MB | 292 MB |
| Requires iOS | **6.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Modern Educational Research Society, LTD](https://appshunter.io/developer/432268704) | [Open Knowledge Association Ltd.](https://appshunter.io/developer/868011308) |

## What reviewers say

### 幸運球

[App page](https://appshunter.io/ios/app/id951266641)

**Features:** macOS Compatibility

**In-app purchases:** none


### RainbowSky

[App page](https://appshunter.io/ios/app/rainbowsky/id6771268020)

**In-app purchases:** none


## Frequently asked questions

### Is 幸運球 free?

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

### Is RainbowSky free?

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

### Do 幸運球 or RainbowSky have ads?

Neither 幸運球 nor RainbowSky shows ads.

### Which is updated more often, 幸運球 or RainbowSky?

幸運球 ships an update every 36 months, and RainbowSky every 2 weeks. Most recently, 幸運球 was updated on October 3, 2026 and RainbowSky on October 6, 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.*