# Math Idol vs Gem RainbowGirl

The clearest difference is in-app purchases: Gem RainbowGirl at none against Math Idol's 1. Gem RainbowGirl also leads on ads (none vs shown) and update cadence (daily vs weekly). On price and device support there is nothing between them.

Both are free to download. Math Idol sells 1 one-off in-app purchase. Gem RainbowGirl asks for nothing beyond the download.

Math Idol ships an update weekly, Gem RainbowGirl daily. The most recent releases landed on October 6, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Math Idol | Gem RainbowGirl |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | **Daily** |
| Size | 445 MB | 141 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [DANIEL DEL CASTILLO](https://appshunter.io/developer/576998059) | [Nhung Le Van](https://appshunter.io/developer/1872032968) |

## What reviewers say

### Math Idol

[App page](https://appshunter.io/ios/app/math-idol/id6757206532)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### Gem RainbowGirl

[App page](https://appshunter.io/ios/app/gem-rainbowgirl/id6758370849)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Math Idol free?

Math Idol is free to download, with in-app purchases available.

### Is Gem RainbowGirl free?

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

### Do Math Idol or Gem RainbowGirl have ads?

Math Idol shows ads; Gem RainbowGirl does not.

### Which is updated more often, Math Idol or Gem RainbowGirl?

Math Idol ships an update weekly, and Gem RainbowGirl daily. Most recently, Math Idol was updated on October 6, 2026 and Gem RainbowGirl on October 4, 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.*