# Vigilance Buddy vs C2 Stroop Task

The clearest difference is update cadence: Vigilance Buddy at every 4 months against C2 Stroop Task's every 10 months. Vigilance Buddy also leads on price ($1.99 vs $3.99). C2 Stroop Task's advantage is iOS requirement (15.6 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Vigilance Buddy costs $1.99 and C2 Stroop Task $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Vigilance Buddy ships an update every 4 months, C2 Stroop Task every 10 months. The most recent releases landed on September 25, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Vigilance Buddy | C2 Stroop Task |
| --- | --- | --- |
| Price | **$1.99** | $3.99 |
| Rating | **[4.4 (44 ratings)](https://appshunter.io/ios/app/vigilance-buddy/id1319447211/reviews)** | — |
| Number of ratings | **44** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 10 months |
| Monetization | Paid | — |
| Size | 2 MB | 1 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Byrt](https://appshunter.io/developer/1084236360) | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) |

## What reviewers say

### Vigilance Buddy

[App page](https://appshunter.io/ios/app/vigilance-buddy/id1319447211)

This app measures response speed to visual stimuli using a psychomotor vigilance task. Users can customize test parameters and easily collect and email results. Its user-friendly design makes it accessible to individuals with varying levels of tech experience.

**Highlights:** Psychomotor vigilance task (PVT), Measures response speed, Customizable test parameters, Collect and email results, User-friendly interface

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

**In-app purchases:** none


### C2 Stroop Task

[App page](https://appshunter.io/ios/app/c2-stroop-task/id1638265933)

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

**In-app purchases:** none


## Frequently asked questions

### Is Vigilance Buddy free?

Vigilance Buddy costs $1.99, with no in-app purchases.

### Is C2 Stroop Task free?

C2 Stroop Task costs $3.99, with no in-app purchases.

### Do Vigilance Buddy or C2 Stroop Task have ads?

Neither Vigilance Buddy nor C2 Stroop Task shows ads.

### Which is updated more often, Vigilance Buddy or C2 Stroop Task?

Vigilance Buddy ships an update every 4 months, and C2 Stroop Task every 10 months. Most recently, Vigilance Buddy was updated on September 25, 2026 and C2 Stroop Task on September 24, 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.*