# Stroop Test J Lite vs Reaction Time Test

The clearest difference is ads: Reaction Time Test at none against Stroop Test J Lite's shown. Reaction Time Test also leads on update cadence (every 8 days vs every 36 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Stroop Test J Lite ships an update every 36 months, Reaction Time Test every 8 days. The most recent releases landed on October 24, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Stroop Test J Lite | Reaction Time Test |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 36 months | **Every 8 days** |
| Monetization | Ad-supported | — |
| Size | 4 MB | 5 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Takuya Kawakami](https://appshunter.io/developer/721449462) | [Jinwan Kim](https://appshunter.io/developer/1446513824) |

## What reviewers say

### Stroop Test J Lite

[App page](https://appshunter.io/ios/app/stroop-test-j-lite/id1095231198)

This app measures response inhibition and attention by presenting a classic cognitive test. It helps assess potential frontal lobe dysfunction and interference processing. Results indicate time taken and errors, with higher scores suggesting greater impairment.

**Highlights:** Response inhibition assessment, Attention division test, Measures time to complete, Counts mistakes, Interference processing evaluation

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

**In-app purchases:** none


### Reaction Time Test

[App page](https://appshunter.io/ios/app/reaction-time-test-millis/id6805464656)

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

**In-app purchases:** none


## Frequently asked questions

### Is Stroop Test J Lite free?

Stroop Test J Lite is free to download, with no in-app purchases.

### Is Reaction Time Test free?

Reaction Time Test is free to download, with no in-app purchases.

### Do Stroop Test J Lite or Reaction Time Test have ads?

Stroop Test J Lite shows ads; Reaction Time Test does not.

### Which is updated more often, Stroop Test J Lite or Reaction Time Test?

Stroop Test J Lite ships an update every 36 months, and Reaction Time Test every 8 days. Most recently, Stroop Test J Lite was updated on October 24, 2026 and Reaction Time Test on October 4, 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.*