# NAWL Builder 日本語版 vs StroopEffect2

The clearest difference is price: NAWL Builder 日本語版 at Free against StroopEffect2's $2.99. NAWL Builder 日本語版 also leads on iOS requirement (7.0 vs 15.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

NAWL Builder 日本語版 is free to download; StroopEffect2 costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

NAWL Builder 日本語版 ships an update every 8 months, StroopEffect2 every 14 months. The most recent releases landed on September 15, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | NAWL Builder 日本語版 | StroopEffect2 |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 14 months |
| Monetization | — | Paid |
| Size | 46 MB | 2 MB |
| Requires iOS | **7.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [EFL Technologies](https://appshunter.io/developer/942981362) | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) |

## What reviewers say

### NAWL Builder 日本語版

[App page](https://appshunter.io/ios/app/nawl-builder/id973368033)

**Features:** macOS Compatibility

**In-app purchases:** none


### StroopEffect2

[App page](https://appshunter.io/ios/app/stroopeffect2/id1050388935)

This app demonstrates the psychological phenomenon known as the Stroop effect. It presents a time-trial game where users must identify the color of words, even when the word itself names a different color. It's a fun way to explore cognitive processing and reaction times.

**Highlights:** Stroop effect demonstration, Time trial game mode, Cognitive processing experiment, Reaction time measurement, Educational psychology tool

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

**In-app purchases:** none


## Frequently asked questions

### Is NAWL Builder 日本語版 free?

NAWL Builder 日本語版 is free to download, with no in-app purchases.

### Is StroopEffect2 free?

StroopEffect2 costs $2.99, with no in-app purchases.

### Do NAWL Builder 日本語版 or StroopEffect2 have ads?

Neither NAWL Builder 日本語版 nor StroopEffect2 shows ads.

### Which is updated more often, NAWL Builder 日本語版 or StroopEffect2?

NAWL Builder 日本語版 ships an update every 8 months, and StroopEffect2 every 14 months. Most recently, NAWL Builder 日本語版 was updated on September 15, 2026 and StroopEffect2 on September 18, 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.*