Crazy Hard Fast Math Reaction vs Stack Jump
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Crazy Hard Fast Math Reaction
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.
- Infinite math calculations
- Two-button right/wrong input
- Timed challenges
- Difficulty options (easy, normal, hard)
- Multiple leaderboards
- Multiplayer competition
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Crazy Hard Math Challenge - You get it? An infinite number of math calculations await you, 2 buttons, right or wrong, and a very short amount of time. Race the clock to get a high score, take the easy, normal or hard option, it's your choice, but with 3 different leaderboards, why not prove to your friends who is the king of math? It really doesn't get much harder than this! Are you up for the challenge?
Stack Jump
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.
- Stack blocks to build towers
- Endless mode for highscores
- 36 challenges to complete
- Unlock 20 characters
- Improve highscore
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How high can you climb? Jump to stack blocks and build the biggest tower imaginable! Improve your highscore in endless mode, complete the 36 challenges and unlock all 20 characters!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 25, 2026 respectively.
| Parameter | Crazy Hard Fast Math Reaction | Stack Jump |
|---|---|---|
| Price | Free | Free |
| Rating | 1.7 (29 ratings) | 4.6 (299K ratings) — better |
| Positive reviews | 27.3% of reviews | 47.7% of reviews — better |
| Number of ratings | 29 | 299K — better |
| Update frequency | Every 11 months | Every 4 weeks — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.4 — better | 13.0 |
| Further details — not scored | ||
| Size | 48 MB | 155 MB |
| Age rating | 4+ | +12 |
| Developer | Fragranze Games Ltd | Voodoo |
Customer experience
Crazy Hard Fast Math Reaction
Stack Jump
Bugs and requests
Crazy Hard Fast Math Reaction
Not enough reviews yet to summarise bugs or requests.
Stack Jump
Reported bugs
4 issues- Game crashes on launch
- Blocks not registering perfect jumps
- Second chance feature not working as expected
- Inconsistent performance across devices
Requested features
4 requests- Reduce ads or offer paid ad-free version
- Improve stability and fix bugs
- Add more challenge modes and levels
- Introduce leaderboards and social features
In-app purchases
Crazy Hard Fast Math Reaction
- Remove Ads$1.99
Stack Jump
- Remove Ads$2.99
Questions
Is Crazy Hard Fast Math Reaction free?
Is Stack Jump free?
Which has better reviews, Crazy Hard Fast Math Reaction or Stack Jump?
Do Crazy Hard Fast Math Reaction or Stack Jump have ads?
Which is updated more often, Crazy Hard Fast Math Reaction or Stack Jump?
Other comparisons
