# 81 Rush vs Math Challenge

The clearest difference is in-app purchases: Math Challenge at none against 81 Rush's 3. Math Challenge also leads on ads (none vs shown) and iOS requirement (11.0 vs 17.0). On price and device support there is nothing between them.

Both are free to download. 81 Rush sells 3 one-off in-app purchases. Math Challenge asks for nothing beyond the download.

## The numbers

| Metric | 81 Rush | Math Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (31 ratings)](https://appshunter.io/ios/app/81-rush/id881743883/reviews)** | — |
| Number of ratings | **31** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | — |
| Monetization | Free | — |
| Size | 129 MB | 60 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hoang Phan](https://appshunter.io/developer/881747886) | [Bhautik Gadhiya](https://appshunter.io/developer/1190085439) |

## What reviewers say

### 81 Rush

[App page](https://appshunter.io/ios/app/81-rush/id881743883)

A 9x9 board puzzle game where players tap numbers from 1 to 81 in ascending order. It requires focus, speed, and memory to achieve high scores.

**Highlights:** 9x9 board puzzle, Tap numbers 1-81, Ascending order gameplay, Focus and speed challenge, High score pursuit

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-Free Pass · 1 Month | $0.99 | one-time |
| Ad-Free Pass · 3 Months | $1.99 | one-time |
| No more Ads | $9.99 | one-time |


### Math Challenge

[App page](https://appshunter.io/ios/app/math-challenge-mind-maker/id1571488851)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 81 Rush free?

81 Rush is free to download, with in-app purchases available.

### Is Math Challenge free?

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

### Do 81 Rush or Math Challenge have ads?

81 Rush shows ads; Math 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.*