# Crazy Hard Fast Math Reaction vs Sigma 100

The clearest difference is in-app purchases: Sigma 100 at none against Crazy Hard Fast Math Reaction's 1. Crazy Hard Fast Math Reaction's advantage is update cadence (every 11 months vs every 39 months) and iOS requirement (12.4 vs 14.0). On price, ads and device support there is nothing between them.

Both are free to download. Crazy Hard Fast Math Reaction sells 1 one-off in-app purchase. Sigma 100 asks for nothing beyond the download.

Crazy Hard Fast Math Reaction ships an update every 11 months, Sigma 100 every 39 months. The most recent releases landed on November 1, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Crazy Hard Fast Math Reaction | Sigma 100 |
| --- | --- | --- |
| 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 | Yes |
| Update frequency | **Every 11 months** | Every 39 months |
| Monetization | Free with in-app purchases | — |
| Size | 48 MB | 4 MB |
| Requires iOS | **12.4** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fragranze Games Ltd](https://appshunter.io/developer/640751335) | [CHIEN-HUNG CHEN](https://appshunter.io/developer/460805169) |

## 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 |


### Sigma 100

[App page](https://appshunter.io/ios/app/sigma-100/id1562647378)

**Features:** macOS Compatibility

**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 Sigma 100 free?

Sigma 100 is free to download, with no in-app purchases.

### Do Crazy Hard Fast Math Reaction or Sigma 100 have ads?

Both Crazy Hard Fast Math Reaction and Sigma 100 show ads.

### Which is updated more often, Crazy Hard Fast Math Reaction or Sigma 100?

Crazy Hard Fast Math Reaction ships an update every 11 months, and Sigma 100 every 39 months. Most recently, Crazy Hard Fast Math Reaction was updated on November 1, 2026 and Sigma 100 on October 27, 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.*