# iStroopChallenge vs Math Duel

The clearest difference is in-app purchases: iStroopChallenge at none against Math Duel's 4. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Math Duel sells 4 one-off in-app purchases. iStroopChallenge asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 6 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | iStroopChallenge | Math Duel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/istroopchallenge/id6755783575/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 days | Every 6 days |
| Monetization | Free | — |
| Size | 29 MB | 25 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Steve Hunger](https://appshunter.io/developer/1840531947) | [Seif Ibrahim](https://appshunter.io/developer/1173469733) |

## What reviewers say

### iStroopChallenge

[App page](https://appshunter.io/ios/app/istroopchallenge/id6755783575)

Engage your brain with four distinct focus challenges, including the classic Stroop test. Improve self-control, flexibility, memory, and spatial skills through daily puzzles and various game modes. Compete with friends and track your progress with detailed statistics.

**Highlights:** Classic Stroop test, Four distinct focus challenges, Daily puzzles with streaks, Customizable game modes, Friend challenges and leaderboards, Color blind modes, Detailed progress tracking

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

**In-app purchases:** none


### Math Duel

[App page](https://appshunter.io/ios/app/math-duel-brain-battle/id6765615076)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Neon Theme Pack | $0.99 | one-time |
| Nature Theme Pack | $0.99 | one-time |
| Retro Theme Pack | $0.99 | one-time |
| Math Duel Pro | $2.99 | one-time |


## Frequently asked questions

### Is iStroopChallenge free?

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

### Is Math Duel free?

Math Duel is free to download, with in-app purchases available.

### Do iStroopChallenge or Math Duel have ads?

Neither iStroopChallenge nor Math Duel shows ads.

### Which is updated more often, iStroopChallenge or Math Duel?

iStroopChallenge ships an update every 6 days, and Math Duel every 6 days. Most recently, iStroopChallenge was updated on November 5, 2026 and Math Duel on October 31, 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.*