# Crystal Math vs Math Duel Challenge

The clearest difference is in-app purchases: Math Duel Challenge at none against Crystal Math's 3. Math Duel Challenge also leads on ads (none vs shown) and iOS requirement (10.1 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Crystal Math sells 3 one-off in-app purchases. Math Duel Challenge asks for nothing beyond the download.

## The numbers

| Metric | Crystal Math | Math Duel Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/crystal-math-numbers-on-speed/id1261401422/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 28 MB | 25 MB |
| Requires iOS | 15.0 | **10.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rafael Kolloch](https://appshunter.io/developer/985182742) | [Son Phi](https://appshunter.io/developer/1337183344) |

## What reviewers say

### Crystal Math

[App page](https://appshunter.io/ios/app/crystal-math-numbers-on-speed/id1261401422)

This game offers four distinct modes to sharpen your mental arithmetic. Compete against the clock, challenge other players, or practice at your own pace to become a math champion and unlock achievements.

**Highlights:** Daily challenges with leaderboards, Player vs. player duels, 30-second time attack mode, Free exploration mode, Avatar customization, Achievement unlocking

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hipster | $0.99 | one-time |
| Famous | $0.99 | one-time |
| Cinema | $0.99 | one-time |


### Math Duel Challenge

[App page](https://appshunter.io/ios/app/math-duel-challenge/id1337183345)

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

**In-app purchases:** none


## Frequently asked questions

### Is Crystal Math free?

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

### Is Math Duel Challenge free?

Math Duel Challenge is free to download, with no in-app purchases.

### Do Crystal Math or Math Duel Challenge have ads?

Crystal Math shows ads; Math Duel Challenge does not.

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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.*