# Stroop Test J Lite vs Frequency Generator (Ape Apps)

The clearest difference is in-app purchases: Stroop Test J Lite at none against Frequency Generator (Ape Apps)'s 1. Frequency Generator (Ape Apps)'s advantage is update cadence (every 5 months vs every 36 months). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Frequency Generator (Ape Apps) sells 1 one-off in-app purchase. Stroop Test J Lite asks for nothing beyond the download.

Stroop Test J Lite ships an update every 36 months, Frequency Generator (Ape Apps) every 5 months. The most recent releases landed on October 14, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Stroop Test J Lite | Frequency Generator (Ape Apps) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/frequency-generator-ape-apps/id1588733914/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 36 months | **Every 5 months** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 4 MB | 9 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Takuya Kawakami](https://appshunter.io/developer/721449462) | [Brandon Stecklein](https://appshunter.io/developer/498894252) |

## 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


### Frequency Generator (Ape Apps)

[App page](https://appshunter.io/ios/app/frequency-generator-ape-apps/id1588733914)

Generate various audio waveforms like sine, square, sawtooth, and triangle waves. Adjust frequencies from 50Hz to 16000Hz, set custom timers, or tune to musical notes for diverse applications.

**Highlights:** Sine, square, sawtooth, triangle wave generation, Frequency range 50Hz - 16000Hz, Custom frequency setting, Timer functionality, Musical note tuning

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Frequency Generator Premium | $2.99 | one-time |


## Frequently asked questions

### Is Stroop Test J Lite free?

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

### Is Frequency Generator (Ape Apps) free?

Frequency Generator (Ape Apps) is free to download, with in-app purchases available.

### Do Stroop Test J Lite or Frequency Generator (Ape Apps) have ads?

Both Stroop Test J Lite and Frequency Generator (Ape Apps) show ads.

### Which is updated more often, Stroop Test J Lite or Frequency Generator (Ape Apps)?

Stroop Test J Lite ships an update every 36 months, and Frequency Generator (Ape Apps) every 5 months. Most recently, Stroop Test J Lite was updated on October 14, 2026 and Frequency Generator (Ape Apps) on October 20, 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.*