# Crazy Hard Fast Math Reaction vs @CalcMaster

The clearest difference is in-app purchases: @CalcMaster at none against Crazy Hard Fast Math Reaction's 1. @CalcMaster also leads on ads (none vs shown) and update cadence (every 10 days vs every 11 months). Crazy Hard Fast Math Reaction's advantage is device support (3 vs 1) and iOS requirement (12.4 vs 16.6). On price there is nothing between them.

Both are free to download. Crazy Hard Fast Math Reaction sells 1 one-off in-app purchase. @CalcMaster asks for nothing beyond the download.

Crazy Hard Fast Math Reaction ships an update every 11 months, @CalcMaster every 10 days. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Crazy Hard Fast Math Reaction | @CalcMaster |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.7 (29 ratings)](https://appshunter.io/ios/app/crazy-hard-fast-math-reaction/id877393958/reviews)** | — |
| Number of ratings | **29** | — |
| Positive reviews | 27.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 11 months | **Every 10 days** |
| Monetization | Free with in-app purchases | — |
| Size | 48 MB | 58 MB |
| Requires iOS | **12.4** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Fragranze Games Ltd](https://appshunter.io/developer/640751335) | [David Kelen](https://appshunter.io/developer/1796712157) |

## What reviewers say

### Crazy Hard Fast Math Reaction

[App page](https://appshunter.io/ios/app/crazy-hard-fast-math-reaction/id877393958)

Test your math skills with an infinite number of calculations. Choose your difficulty and race against the clock to achieve a high score. Compete with friends on multiple leaderboards to prove your math prowess.

**Highlights:** Infinite math calculations, Two-button right/wrong input, Timed challenges, Difficulty options (easy, normal, hard), Multiple leaderboards, Multiplayer competition

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

**In-app purchases (1)**

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


### @CalcMaster

[App page](https://appshunter.io/ios/app/calcmaster/id6743536646)

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

**In-app purchases:** none


## Frequently asked questions

### Is Crazy Hard Fast Math Reaction free?

Crazy Hard Fast Math Reaction is free to download, with in-app purchases available.

### Is @CalcMaster free?

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

### Do Crazy Hard Fast Math Reaction or @CalcMaster have ads?

Crazy Hard Fast Math Reaction shows ads; @CalcMaster does not.

### Which is updated more often, Crazy Hard Fast Math Reaction or @CalcMaster?

Crazy Hard Fast Math Reaction ships an update every 11 months, and @CalcMaster every 10 days. Most recently, Crazy Hard Fast Math Reaction was updated on October 5, 2026 and @CalcMaster on October 7, 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.*