# Crazy Hard Fast Math Reaction vs Stack Jump

The clearest difference is rating: Stack Jump at 4.6 against Crazy Hard Fast Math Reaction's 1.7. Stack Jump also leads on update cadence (every 4 weeks vs every 11 months) and ratings volume (299K vs 29). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Crazy Hard Fast Math Reaction sells 1 one-off in-app purchase and Stack Jump sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Stack Jump holds the better App Store score, 4.6 against 1.7. That said, the two scores are not equally well evidenced: Stack Jump has 299K ratings behind it against 29, so its average is the more settled of the two. Written reviews point the same way: 27% of Crazy Hard Fast Math Reaction's written reviews are positive against 48% of Stack Jump's.

Crazy Hard Fast Math Reaction ships an update every 11 months, Stack Jump every 4 weeks. The most recent releases landed on October 22, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Crazy Hard Fast Math Reaction | Stack Jump |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.7 (29 ratings)](https://appshunter.io/ios/app/crazy-hard-fast-math-reaction/id877393958/reviews) | **[4.6 (299K ratings)](https://appshunter.io/ios/app/stack-jump/id1263426717/reviews)** |
| Number of ratings | 29 | **299K** |
| Positive reviews | 27.3% of reviews | **47.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 11 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 48 MB | 155 MB |
| Requires iOS | **12.4** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +12 |
| Developer | [Fragranze Games Ltd](https://appshunter.io/developer/640751335) | [Voodoo](https://appshunter.io/developer/714804730) |

## 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 |


### Stack Jump

[App page](https://appshunter.io/ios/app/stack-jump/id1263426717)

Build the tallest tower by stacking blocks as high as you can. Compete for your highscore in an endless mode, conquer 36 challenges, and unlock 20 unique characters.

**Highlights:** Stack blocks to build towers, Endless mode for highscores, 36 challenges to complete, Unlock 20 characters, Improve highscore

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |

**What reviewers like**

- 🤩 Addictive and fun gameplay
- 😍 Cute and charming characters
- 🎨 Variety of themes and backgrounds
- 🎉 Rewarding to unlock new content

**What reviewers complain about**

- 🤬 Excessive and intrusive ads
- 🐛 Frequent crashes and glitches
- 🤯 Laggy performance and freezing issues
- 😕 Inconsistent scoring/mechanics

**Reported bugs**

- Game crashes on launch
- Blocks not registering perfect jumps
- Second chance feature not working as expected
- Inconsistent performance across devices

**Requested features**

- Reduce ads or offer paid ad-free version
- Improve stability and fix bugs
- Add more challenge modes and levels
- Introduce leaderboards and social features


## 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 Stack Jump free?

Stack Jump is free to download, with in-app purchases available.

### Which has better reviews, Crazy Hard Fast Math Reaction or Stack Jump?

Stack Jump is rated higher. Crazy Hard Fast Math Reaction averages 1.7 out of 5 from 29 ratings, while Stack Jump averages 4.6 from 299K ratings.

### Do Crazy Hard Fast Math Reaction or Stack Jump have ads?

Both Crazy Hard Fast Math Reaction and Stack Jump show ads.

### Which is updated more often, Crazy Hard Fast Math Reaction or Stack Jump?

Crazy Hard Fast Math Reaction ships an update every 11 months, and Stack Jump every 4 weeks. Most recently, Crazy Hard Fast Math Reaction was updated on October 22, 2026 and Stack Jump on October 26, 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.*