# Dual N-Back - Brain Trainer — 5-Minute Daily Focus Workout

> 5-Minute Daily Focus Workout (iPhone/iPad app by Takanori Horitsu.)

- Source: https://appshunter.io/ios/app/dual-n-back-brain-trainer/id6767109556 (this page in markdown: same URL + `.md`)
- Developer: [Takanori Horitsu](https://appshunter.io/developer/1896386009)
- Category: Education, Health & Fitness
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.6 · 12 MB
- Languages: American English, Japanese
- Released: 2026-05-08
- Data updated: 2026-10-02

## What is Dual N?

Practice Dual N-Back at your own pace, for about five minutes a day.

Dual N-Back asks you to decide whether the current cue matches the one presented N steps earlier. Practice comparing positions and audio cues, then review your session results over time.

GET STARTED WITH AN INTERACTIVE TUTORIAL
Learn the rules and response controls by trying them before you train.

BUILD A DAILY ROUTINE
Start an approximately five-minute session from Home, or use a session with configurable trial counts and settings.

CHOOSE YOUR N LEVEL
Let the app adjust your N level using the average of your latest three completed sessions, or select it manually. Customize the accuracy thresholds for raising and lowering N in 5-point steps, and reset them to the standard 80% / 50% values at any time. This adjustment average includes sessions with different N levels and combinations.

REVIEW YOUR PROGRESS
Check your history, practice streak and achievements. The growth report compares only records with the same N level, element combination, game mode, cue mode, timing and other training conditions. View session counts, average, best and a chart for 7 days, 30 days or all saved records.

STANDARD AND EXPANDED MODES
Standard mode, with position and letter cues, is free. The separate Expanded Mode purchase lets you choose any two elements (6 combinations), any three (4 combinations), or all four from position, letter, color and shape. Choose an element count and combination from a clear list; only your selected elements are trained and scored. Existing Expanded Mode owners do not need another purchase.

ADS AND OPTIONAL PURCHASES
If you have not purchased Ad-Free, a banner may appear at the bottom of the result screen. Ads are not shown during training.

Two independent one-time purchases are available. Neither is a subscription:
- Ad-Free removes result-screen ads. It does not include Expanded Mode.
- Expanded Mode unlocks two- to four-element combinations that include color or shape. It does not remove ads.

Current prices appear on the purchase screen. Use Restore Purchases on that screen to check previously purchased entitlements.

DATA AND PRIVACY
Play history, settings and achievements are stored on your device. The app uses Firebase Analytics for usage analysis and services including Google Mobile Ads for advertising, which make network connections. See App Privacy on the App Store and the privacy policy for details about data handling and purposes.

LANGUAGES
Japanese and English.

Support and terms
https://hori2-t.github.io/dual-nback-legal/

Privacy policy
https://hori2-t.github.io/dual-nback-legal/privacy.html

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Ad-Free | $0.99 | one-time |


## Is Dual N safe?

Not enough ratings yet to assess Dual N.

## Is Dual N legit?

Dual N-Back - Brain Trainer has limited verification signals. The AppsHunter Legitimacy Score for Dual N is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.3.5 — 2026-09-29

- Choose any two, three or all four elements from position, letter, color and shape in Expanded Mode. No additional purchase is needed for existing owners.
- Customize the accuracy thresholds for automatically raising and lowering N in 5-point steps.
- Compare progress only across records with the same element combination.
- Improved English labels in the growth report.

### 1.3.4 — 2026-09-28

Improved English messaging when in-app purchases are temporarily unavailable.

### 1.3.3 — 2026-09-19

Added growth reports that compare your progress under the same training conditions.
Review your progress and personal bests more clearly.

### 1.3.2 — 2026-09-14

Expanded Mode now lets you choose any 2–4 dimensions from position, letters, colors, and shapes. Only selected dimensions are presented, scored, and included in results and statistics.

### 1.3.1 — 2026-09-10

- Improved the board layout in Standard and Expanded modes so the board and response controls remain clearly visible.
- Improved continuity of existing history, settings and achievement data.
- Improved ad handling so ads are not shown while purchase entitlements are being resolved.

## Apps similar to Dual N

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Dual N Back](https://appshunter.io/ios/app/dual-n-back/id6767213239) | — | Free | Education |
| [BrainPulse Dual N-Back](https://appshunter.io/ios/app/brainpulse-dual-n-back/id6761100839) | — | Free | Education |
| [ゆるN-Back](https://appshunter.io/ios/app/n-back/id6755930194) | — | Free | Education |
| [アルゴリズム探索](https://appshunter.io/ios/app/id6793779484) | — | Free | Education |
| [ITパスポート 暗記・勉強アプリ](https://appshunter.io/ios/app/it/id6776047396) | — | Free | Education |
| [歴検世界史3級 過去問・暗記アプリ](https://appshunter.io/ios/app/3/id6797898926) | — | Free | Education |

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-02.*