Dual N vs Nuddle
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- Working memory training
- Customizable difficulty (N-value, interval, session length)
- Goal setting and reminders
- Global leaderboards
- Multilingual support
- Ad-free Pro version
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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!
Nuddle
Engage your mind with daily number sequence puzzles. Discover the underlying system to find the missing digits and build your solving streak. Enjoy unlimited random puzzles and share challenges with friends.
- Daily global number puzzles
- Infinite random sequences
- Streak building system
- Local puzzle caching
- Share puzzles with friends
- Recognize number systems
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Solve number sequences and daily number puzzles in short, focused brain breaks. Spot patterns in number sequences, solve the Daily Nuddle, and keep your streak alive. When you want more, jump into quick mental-math rounds, pattern sprints, memory challenges, Code Recall, and Number Matrix. Nuddle is not a traditional exam-prep app. But if you want training for MedAT or other admission tests on the go, it can help you practice faster pattern recognition, focused number work, and memory in short sessions. Each puzzle is short enough for any spare moment, but clever enough to feel satisfying when the rule clicks. No long instructions, no puzzle clutter: Nuddle shows you numbers, you find the system. What you get: - Logic: Sequences, Sequence Challenge, Number Matrix, Emoji Equations, Dice Fold - Speed: Quick Math, Pattern Sprint, Number Rush, Odd One Out, True or False, Path to Target, Gravity Shift - Memory: Target Recall, Code Recall, Count Recall, Path Recall, Match Math - Casual: Four in a Row, Tower of Hanoi, Merge, Nonogram - Admission-test training on the go - Local progress, streaks, and best scores - Light and dark design - Offline play whenever you want a quick brain break Nuddle is for anyone who likes number puzzles, logic games, mental math, patterns, and small daily challenges. Download Nuddle and find the next two numbers. Nuddle is free to download and includes the Daily Nuddle plus selected game modes at no cost. Nuddle Plus is available as an optional auto-renewable monthly or yearly subscription and unlocks all game modes while the subscription is active. Nuddle contains no ads. Payment is charged to your store account at confirmation of purchase. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period. You can manage or cancel your subscription in your store account settings. You can try every locked game mode once for free before subscribing. Terms of Use (EULA): https://nuddle.schmutweiss.com/terms Privacy Policy: https://nuddle.schmutweiss.com/privacy
Screenshots
Verdict
The clearest difference is ads: Nuddle at none against Dual N's shown. Nuddle also leads on rating (4.9 vs 4.6) and iOS requirement (13.0 vs 15.0). Dual N's advantage is ratings volume (376 vs 8) and review sentiment (51% vs 43%). On price, update cadence, in-app purchases and monetization model 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
Both are free to download. Dual N sells 2 in-app purchases, starting at $0.99 per month and Nuddle sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
Nuddle holds the better App Store score, 4.9 against 4.6. That said, the two scores are not equally well evidenced: Dual N has 376 ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 51% of Dual N's written reviews are positive against 43% of Nuddle's, so the app with the better star average is not the one people write more warmly about.
Dual N ships an update fortnightly, Nuddle weekly. Both last shipped on November 3, 2026.
| Parameter | Dual N | Nuddle |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (376 ratings) | 4.9 (8 ratings) — better |
| Positive reviews | 50.9% of reviews — better | 42.9% of reviews |
| Number of ratings | 376 — better | 8 |
| Update frequency | Fortnightly | Weekly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 199 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | GOKAKU SUPPLI, LIMITED LIABILITY CO. | SCHMUT WEISS GmbH |
Customer experience
Dual N
Nuddle
In-app purchases
Dual N
- NBack Monthly Subscription3 Days trial$0.991 Month
- Lifetime Pass$12.99
Nuddle
- Nuddle Plus Monthly$4.991 Month
- Nuddle Plus Yearly$14.991 Year
- Remove ads$12.99









