# Less Math 算數 (校園版) vs RainbowSky

The clearest difference is update cadence: Less Math 算數 (校園版) at every 5 days against RainbowSky's every 2 weeks. 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.

Less Math 算數 (校園版) ships an update every 5 days, RainbowSky every 2 weeks. The most recent releases landed on September 14, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Less Math 算數 (校園版) | RainbowSky |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 weeks |
| Size | 69 MB | 292 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RiteX Ai Technologies Limited](https://appshunter.io/developer/1558355552) | [Open Knowledge Association Ltd.](https://appshunter.io/developer/868011308) |

## What reviewers say

### Less Math 算數 (校園版)

[App page](https://appshunter.io/ios/app/less-math/id6496284077)

**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 Less Math 算數 (校園版) free?

Less Math 算數 (校園版) is free to download, with no in-app purchases.

### Is RainbowSky free?

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

### Do Less Math 算數 (校園版) or RainbowSky have ads?

Neither Less Math 算數 (校園版) nor RainbowSky shows ads.

### Which is updated more often, Less Math 算數 (校園版) or RainbowSky?

Less Math 算數 (校園版) ships an update every 5 days, and RainbowSky every 2 weeks. Most recently, Less Math 算數 (校園版) was updated on September 14, 2026 and RainbowSky on September 19, 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.*