# Dual N-Back - 脳トレ

> 1日5分の集中力トレーニング

Canonical page: [https://chrome-stats.com/d/id6767109556](https://chrome-stats.com/d/id6767109556)

## Overview

- **ID:** `id6767109556`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Takanori Horitsu
- **Category:** Education
- **Version:** 1.3
- **Last updated:** 2026-09-05
- **First published:** 2026-05-08
- **Size:** 12 MB
- **Data as of:** 2026-09-10
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/dual-n-back-%E8%84%B3%E3%83%88%E3%83%AC/id6767109556)
- **Website:** [https://hori2-t.github.io/dual-nback-legal/](https://hori2-t.github.io/dual-nback-legal/)
- **Privacy policy:** [https://hori2-t.github.io/dual-nback-legal/privacy.html](https://hori2-t.github.io/dual-nback-legal/privacy.html)

## Description

⏺ Train working memory in 5 minutes a day. Make brain maintenance a habit, like brushing your teeth.

  Dual N-Back is a science-based working memory trainer based on Susanne Jaeggi's 2008 paper "Improving fluid intelligence with training on working memory" — optimized for stress-free daily use on iPhone.

  ■ Built for you if

  - You feel your focus has been slipping
  - You want to maintain memory as you age
  - You've quit other brain trainers (too hard / too gimmicky / didn't stick)
  - You want a 70-second session that fits in any pocket of time
  - You prefer quiet consistency over flashy gamification

  ■ Key Features

  【Science-Based Training】
  The Dual N-Back task — comparing visual position and audio cues simultaneously to N positions ago — is one of the most-studied paradigms in cognitive training (100+ peer-reviewed papers). This app implements the original task faithfully.

  【Around 70 Seconds Per Session】
  20 trials × 3.5 seconds, finishable on the train, at lunch, or before bed. We don't recommend long sessions — once daily is enough for measurable effect.

  【Auto-Adjusting N Level】
  The N level (2-9) auto-tunes based on your last 3 sessions' scores. The AI keeps you at "just above your limit" — sustainable challenge for the long haul.

  【3 Game Modes】
  - Focus: Standard 20-trial session
  - Challenge: Maximize consecutive correct answers
  - Endless: No time limit, full immersion

  【19 Achievement Badges】
  "First Play", "7-Day Streak", "Reach N=5", "90% Accuracy" and more. Badges naturally surface progress without nagging push notifications.

  【Privacy First】
  All scores and history stay on your device. No server transmission, no tracking. Fully Apple Tracking Transparency compliant.

  ■ About Ads

  The free version includes a modest banner ad. Upgrade to Premium (one-time purchase) to remove all ads.

  ■ Optional In-App Purchase

  "Ad-Free" is a one-time $1.99 purchase. Not a subscription, no renewal forgetting. The free version is fully functional.

  ■ Devices

  iPhone (iOS 17+)

  ■ Languages

  Japanese, English

  ■ Privacy Policy / Terms

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

  ■ Contact

  Feedback and bug reports welcome via App Store reviews or GitHub Issues.

## Rankings

- #1,561,993 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6767109556)