# NBack 3D vs Stroop Buddy

NBack 3D and Stroop Buddy both sit at 5.0 stars, but that hides the real split: 100% of NBack 3D's written reviews are positive against 0% of Stroop Buddy's. NBack 3D also leads on price (Free vs $1.99) and update cadence (every 10 months vs every 25 months). Stroop Buddy's advantage is in-app purchases (none vs 1) and ads (none vs shown). On rating, ratings volume, device support and iOS requirement there is nothing between them.

NBack 3D is free to download; Stroop Buddy costs $1.99 up front. NBack 3D sells 1 one-off in-app purchase. Stroop Buddy asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for NBack 3D against 5.0 for Stroop Buddy. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 100% of NBack 3D's written reviews are positive against 0% of Stroop Buddy's.

NBack 3D ships an update every 10 months, Stroop Buddy every 25 months. The most recent releases landed on September 11, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | NBack 3D | Stroop Buddy |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/nback-3d/id1407606652/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/stroop-buddy/id6476831206/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 10 months** | Every 25 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 5 MB | 34 MB |
| Requires iOS | 15.6 | **14.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [Byrt](https://appshunter.io/developer/1084236360) |

## What reviewers say

### NBack 3D

[App page](https://appshunter.io/ios/app/nback-3d/id1407606652)

This app challenges your memory by requiring you to count 3D shapes of specific colors. As the 'N' value increases, the difficulty escalates, testing your ability to recall past stimuli in a sequence.

**Highlights:** N-Back memory challenge, 3D shape and color recognition, Increasing difficulty levels, Sequence memorization, Cognitive skill enhancement

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Extend to 20'Back & Remove Ads | $2.99 | one-time |


### Stroop Buddy

[App page](https://appshunter.io/ios/app/stroop-buddy/id6476831206)

This app provides an interactive way to take the classic Stroop Test, measuring cognitive flexibility and processing speed. It offers customizable tests, immediate performance feedback, and data export for further analysis. Designed for ease of use on mobile devices, it's a fun tool for cognitive skill enhancement.

**Highlights:** Customizable Stroop tests, Instant performance feedback, Data export via email, User-friendly interface, Tests cognitive flexibility, Measures processing speed

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is NBack 3D free?

NBack 3D is free to download, with in-app purchases available.

### Is Stroop Buddy free?

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

### Which has better reviews, NBack 3D or Stroop Buddy?

NBack 3D and Stroop Buddy are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do NBack 3D or Stroop Buddy have ads?

NBack 3D shows ads; Stroop Buddy does not.

### Which is updated more often, NBack 3D or Stroop Buddy?

NBack 3D ships an update every 10 months, and Stroop Buddy every 25 months. Most recently, NBack 3D was updated on September 11, 2026 and Stroop Buddy on September 9, 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.*