Comparison

Dual N vs QBco

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Dual N

This app is a brain game designed to improve working memory and cognitive skills through a challenging memory-training exercise. It offers customizable difficulty, goal setting, and global leaderboards to track progress. An ad-free experience is available via a subscription.

Highlights
  • Working memory training
  • Customizable difficulty (N-value, interval, session length)
  • Goal setting and reminders
  • Global leaderboards
  • Multilingual support
  • Ad-free Pro version
Features
Read full description

Dual NBack – Brain Training to Improve Memory Dual NBack is a fun and challenging brain game designed to strengthen your working memory. Set goals, get reminders, and climb the global leaderboards as you sharpen your mind! What Is Dual NBack? Dual NBack is a memory-training game that presents audio (letters) and visual (positions) sequences simultaneously. Research suggests that consistent play may enhance your working memory—the ability to hold and process information briefly—and also boost short-term recall. How to Play The game starts at Level N=2, where you need to remember the position (square) and the sound (letter) from two turns back. If the current position or sound matches what was shown two turns ago, tap the corresponding button. Strong performance automatically raises your level, but you can manually adjust the difficulty whenever you like. Key Features Customizable Settings Tailor your training: tweak the N-value (number of turns to recall), the interval between sounds/blocks, and session length as you see fit. Reminders & Goals Set daily or weekly targets and enable notifications to help you practice consistently. Global Leaderboards Compare your scores with players worldwide and see how you rank as you improve. Share Function Post your results on social media or messaging apps to challenge your friends and family. Multilingual Support Currently offered in English and Japanese, with more languages on the way. Why Train Your Working Memory? Working memory stores information for a few seconds to minutes, enabling you to make decisions, perform calculations, or tackle other cognitive tasks. Playing Dual NBack regularly can help strengthen this mental capacity, potentially improving focus, concentration, and overall brain agility. Ad-Free Experience with Dual NBack Pro Enjoy a 3-day free trial of Dual NBack Pro to train with no ads or interruptions. If you choose to purchase Dual NBack Pro, the payment is charged to your iTunes account. Renewal fees are charged within 24 hours before the current subscription period ends. You can cancel your subscription anytime: Go to Settings → tap your name → Subscriptions → locate and cancel the subscription you want to end. If you don’t cancel before the trial ends, the paid subscription automatically starts. Privacy Policy: https://goukakuappli.co.jp/privacy End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Summary Strengthen Your Mind: Give your working memory a proven workout. Adapt the Difficulty: Start at N=2 or set your preferred challenge level. Stay Motivated: Leverage reminders, goals, and leaderboards to keep pushing your limits. Go Pro for No Ads: Take advantage of a 3-day free trial and upgrade to an ad-free training experience. Download Dual NBack now and take your cognitive performance to a new level!

About

QBco

Features
Read full description

Challenge your mind with QBco— Tic-Tac-Toe reimagined in three dimensions. Play on a 3×3×3 cube where strategy goes beyond the flat grid. Align three in a row across any axis — horizontal, vertical, or diagonal — through all three layers. Features: - Single player mode with AI opponent - Online multiplayer — match with friends or random opponents - Online multiplayer with friends or random opponents - Intuitive touch controls with orbit camera and pinch-to-zoom - Color-coded victory lines to visualize winning combinations - Session score tracking across rematches - Multiple game modes including unlock center cell challenge Simple to learn, hard to master. The classic game you know, now with a whole new dimension.

Screenshots

Dual N4 screens
QBco4 screens

Verdict

The call

The clearest difference is in-app purchases: QBco at none against Dual N's 2. QBco also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Dual N sells 2 in-app purchases, starting at $0.99 per month. QBco asks for nothing beyond the download.

UpkeepUpdate frequency

Dual N ships an update fortnightly, QBco every 9 days. The most recent releases landed on October 18, 2026 and October 2, 2026 respectively.

Scorecard2 real differences · 8 level
Dual N versus QBco: the parameters behind the verdict, then further details
ParameterDual NQBco
PriceFreeFree
Rating4.6 (362 ratings) — better—
Positive reviews50.9% of reviews—
Number of ratings362 — better—
Update frequencyFortnightlyEvery 9 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size199 MB160 MB
Age rating4+4+
DeveloperGOKAKU SUPPLI, LIMITED LIABILITY CO.MANUEL HOSSEINI SOHI

In-app purchases

2 purchases

Dual N

Subscriptions1
  • NBack Monthly Subscription3 Days trial$0.991 Month
One-time1
  • Lifetime Pass$12.99
None

QBco

No in-app purchases

Questions

Is Dual N free?
Dual N is free to download, with in-app purchases available.
Is QBco free?
QBco is free to download, with no in-app purchases.
Do Dual N or QBco have ads?
Dual N shows ads; QBco does not.
Which is updated more often, Dual N or QBco?
Dual N ships an update fortnightly, and QBco every 9 days. Most recently, Dual N was updated on October 18, 2026 and QBco on October 2, 2026.

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