# 教城教師 vs RainbowSky

The clearest difference is iOS requirement: RainbowSky at 12.0 against 教城教師's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

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

教城教師 ships an update every 3 weeks, RainbowSky every 2 weeks. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | 教城教師 | RainbowSky |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 37 MB | 292 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hong Kong Education City Limited](https://appshunter.io/developer/672104764) | [Open Knowledge Association Ltd.](https://appshunter.io/developer/868011308) |

## What reviewers say

### 教城教師

[App page](https://appshunter.io/ios/app/id1664047385)

**Features:** Vision Pro support

**In-app purchases:** none


### RainbowSky

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

**In-app purchases:** none


## Frequently asked questions

### Is 教城教師 free?

教城教師 is free to download, with no in-app purchases.

### Is RainbowSky free?

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

### Do 教城教師 or RainbowSky have ads?

Neither 教城教師 nor RainbowSky shows ads.

### Which is updated more often, 教城教師 or RainbowSky?

教城教師 ships an update every 3 weeks, and RainbowSky every 2 weeks. Most recently, 教城教師 was updated on October 2, 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.*