Two streams, one challenge
Watch a position on the grid and listen to a letter. Compare each with what appeared N turns earlier.
Memory & attention
Dual N-Back
working memory training for iPhone
iOS 17+ · Free download · In-app purchases
Dual N-Back
In the app
Illustrative screens. Features and appearance may vary by version.
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See how N=2 works
At turn 3, compare with turn 1: the position and letter both match.
Two streams, one challenge
Find your level
Make progress visible
What you can do
Dual N-Back: working memory training for iPhone
A position. A sound. A match to remember. Practise the dual n-back exercise on your iPhone and follow your accuracy as the challenge changes.
Find your level
Begin with N=1, then explore higher levels and additional streams when you are ready for a different challenge.
Make progress visible
Review your session results and practise short cognitive games, including reaction time, Stroop and visual memory.
Your scores describe performance on these tasks. The app does not measure IQ or promise an increase in intelligence.
At a glance
- Developer
- Roméo Gambino
- Platform
- iPhone (iOS)
- App languages
- English, French, German, Italian, Japanese, Russian, Chinese, Spanish
- Availability
- For iPhone · In-app purchases
Guides
Further reading
How to play dual n-back: a clear first session
Understand position matches, sound matches and the meaning of N before your first dual n-back session.
Reaction time and the Stroop test: what these tasks actually measure
How a reaction-time task differs from a Stroop task, what each one loads, why your scores swing so much, and how to compare results without fooling yourself.
How long and how often to train dual n-back: what the studies actually did
Session lengths and frequencies used in dual n-back research, what the evidence shows about transfer, and how to set realistic expectations.
What is working memory? A plain-language explanation
Where the idea of working memory comes from, how researchers measure it, why its capacity is limited, and what an n-back task actually asks of it.
Does dual n-back training work? What the evidence actually says
An honest walk through the research on dual n-back: what improves, what does not, why the meta-analyses disagree, and how to train without fooling yourself.
N-back levels explained: what N=1 to N=5 really demand
What the N in n-back counts, how each level changes the task, why dual is harder than single at the same N, and how to decide when to move up.
Ten dual n-back mistakes that quietly stall your progress
The habits that make dual n-back scores look better than they are, from guessing and level-chasing to training tired, and what to do instead.
How dual n-back scoring works: hits, misses and false alarms
Why a single percentage hides most of what happened in a session, how the four possible outcomes work, and which numbers are worth writing down.
Brain-training exercises compared: what each one actually measures
Dual n-back, digit span, complex span, Stroop, reaction time and commercial brain-training suites, what each demands, and what the evidence supports for each.
Dual N-Back
Questions
What is dual n-back training?
Dual n-back is a working-memory task: compare a position and a sound with the ones presented N turns earlier. The two streams are evaluated separately.
Can I start as a beginner?
Start with N=1 to learn the rhythm, then explore N=2 and higher levels. Session results help you understand your accuracy on the task, not your IQ.
Where are my Dual N-Back scores stored?
On your iPhone only. Session results, reaction-time statistics and the highest level reached stay on the device; nothing is sent to an external server.
How do the levels work?
You start at N=1. Once your accuracy reaches 80% on a level, the next one opens, up to N=15. Triple to Hepta modes add colour, shape, quantity, size and border as extra streams.
Does the app work offline?
Yes. Training sessions and the short cognitive games run entirely on the device and need no connection.
Which languages does the app support?
The app is available in English, French, German, Italian, Japanese, Russian, Chinese and Spanish. The App Store listing shows the current list.
What does it cost?
The App Store and the app show the current price and available purchases in your local currency before confirmation. Trial availability depends on the offer and your eligibility. A free download does not mean every feature is free.
Is the app available in my language?
These are translated website pages. Check the Languages section of the App Store listing for the app itself. Some content may use a different language.
How do I manage a subscription?
On iPhone, open Settings, tap your name, then Subscriptions. Select the app to review or cancel an active subscription. Deleting the app does not cancel a subscription.
Support
Contact support
Include the app name, your iPhone model, iOS version and a description of the issue. Never include passwords or payment details.
Before downloading
iPhone · iOS 17+
Free download · In-app purchases
Languages listed on the App Store
English · Français · Deutsch · Italiano · 日本語 · Русский · 中文 · Español
Memory & attention
Dual N-Back
View on the App StoreFor iPhone · In-app purchases