# Reaction Time Test vs Stroop Challenge Go

The clearest difference is in-app purchases: Stroop Challenge Go at none against Reaction Time Test's 3. Stroop Challenge Go also leads on ads (none vs shown) and iOS requirement (15.0 vs 18.0). On price and device support there is nothing between them.

Both are free to download. Reaction Time Test sells 3 in-app purchases, starting at $1.99 per month. Stroop Challenge Go asks for nothing beyond the download.

## The numbers

| Metric | Reaction Time Test | Stroop Challenge Go |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Size | 38 MB | 1 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Iuliia Arnautova](https://appshunter.io/developer/1891708128) | [晓 郭](https://appshunter.io/developer/1895645928) |

## What reviewers say

### Reaction Time Test

[App page](https://appshunter.io/ios/app/reaction-time-test-reflex/id6761836276)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | per month |
| Premium | $8.99 | per year |
| Lifetime Premium | $12.99 | one-time |


### Stroop Challenge Go

[App page](https://appshunter.io/ios/app/stroop-challenge-go/id6773266246)

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

**In-app purchases:** none


## Frequently asked questions

### Is Reaction Time Test free?

Reaction Time Test is free to download, with in-app purchases available.

### Is Stroop Challenge Go free?

Stroop Challenge Go is free to download, with no in-app purchases.

### Do Reaction Time Test or Stroop Challenge Go have ads?

Reaction Time Test shows ads; Stroop Challenge Go does not.

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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.*