N-Back Memory Training

Contains adsIn-app purchases
947 reviews
Content rating
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About this game

Research suggests that n-back training may lead to gains in fluid intelligence (IQ) and working memory ability (Soveri et al., 2017).

If you rate N-Back Memory Training less than five stars, please leave a comment so that I can address your concerns; I truly value your feedback.


The object of the game is to hold various items in your working memory and actively update these items as the game progresses. With each new trial, press the match button if the current item matches the item that occurred a given number of trials in the past. The term “n-back” denotes how many trials (n) in the past you need to remember. By default, you will begin on 2-back, so press the match button if the current item matches the item that occurred 2 trials back in the past. For a simple demonstration of how to play single 2-back, see this video: https://www.youtube.com/watch?v=qSPOjA2rR0M .


N-Back Memory Training allows you to choose from a diverse set of items to store in working memory:
• the position of a square on a 3 x 3 grid
• sounds (letters, numbers, or piano notes)
• images (shapes, national flags, sports equipment)
• colors

By default, the app starts on dual n-back, using positions and sounds (letters). The “dual” in dual n-back simply denotes how many different item types you will need to remember. You may choose any combination of item types, from single n-back to quad n-back.

Track Progress and Compete with Other Users:

Track your daily progress using customizable, interactive graphs. You can also compare your high scores to other users around the world in real-time with premium mode (upgrade available within the app).


N-Back Memory Training measures your working memory accuracy using the discrimination index A' from signal detection theory (Stanislaw & Todorov, 1999). A’ generally ranges from 0.5 (random guessing) to 1.0 (perfect accuracy). A score of A' >= 0.90 advances you to the next level, and a score of A' <= 0.75 results in fallback to the previous n-back level (after one grace period). These settings can be changed in Manual Mode. For tracking your progress, A' is combined with your current n-back level so that scores range +/- 0.5 around your n-back level. For instance, on 2-back, an accuracy of A' = 1 will yield a score of 2.5, whereas A' = 0.5 will yield a score of 1.5.


A' = .5 + sign(H - F) * ((H - F)^2 + abs(H - F)) / (4 * max(H, F) - 4 * H * F)

Hit Rate (H) = hits / # signal trials
False-positive Rate (F) = false pos / # noise trials

see Stanislaw & Todorov (1999)

Lure Trials:

Within Settings, you can control the percentage of lure trials, which make the task more difficult. Lure trials present stimuli that occurred n-back plus or minus one trial. That is, they are offset one trial from the target trial (n-back).


If you want to change the game speed, the number of trials, or anything else, simply go to Settings > Select Mode > Manual Mode. From there, you can customize virtually anything. You can also customize the app’s appearance by creating your own custom background using color gradients. You can find these options toward the bottom of the Settings menu.

Please send any comments, questions, or concerns to nback.memory.training@gmail.com .
Thanks for playing!
E. A. L.



Soveri, A., Antfolk, J., Karlsson, L., Salo, B., & Laine, M. (2017). Working memory training revisited: A multi-level meta-analysis of n-back training studies. Psychonomic bulletin & review, 24(4), 1077-1096.

Stanislaw, H., & Todorov, N. (1999). Calculation of signal detection theory measures. Behavior research methods, instruments, & computers, 31(1), 137-149.

In-app background image credit: Réseau de neurones. If then else / Wikimedia, CC BY-SA
Updated on
Nov 8, 2022

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location, Personal info and 3 others
Data is encrypted in transit
You can request that data be deleted
947 reviews
Ja Ca
September 25, 2022
I loved this app. It was just what I was looking for. So I paid to remove ads. Unfortunately, as soon as I did that, the app stopped working. It started requiring a login and started freezing. I see someone else complained about the same issue a few weeks ago, but the problem remains. I requested a refund through Google Play. Hopefully when I get my refund, I'll have the free version again, which would get 5 stars. Apparently the developer wants to discourage payment. So don't pay.
Did you find this helpful?
September 25, 2022
Hi Ja, Sorry to hear about this problem. I am not yet sure what is causing the issue, but it does not appear to be a widespread problem and has only recently emerged. I will continue to investigate. In the mean time, can you please send your order ID to nback.memory.training@gmail.com so that a refund can be issued? Thanks! - E.A.L.
Wren Kermode
October 22, 2022
I have a TBI and have been trying to improve my quality of life for awhile. I haven't used the app for long, but I can already tell its going to be extremely helpful and confidence boosting for me. Other apps weren't as helpful as this one. They were too convoluted or too expensive for me try full versions. I greatly appreciate the ability to donate what you can, rather than a fixed price. The ads aren't even that bad if you choose not to pay the 99 cents(or more, if i could afford it).
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Aric Floyd
August 15, 2022
I tried a couple different N-Back apps and this was the best I found. Unfortunately, when I upgraded to premium (at the very generous price of a 1-time pay-what-you-can donation), the app became unusable: upon opening it remained perpetually stuck loading up, even after uninstalling and then reinstalling. To the developer: I recommend changing the logo. Humans do judge books by their covers, for better or worse, and I tried Philip Nguyen's (worse) app first because it looked more professional.
2 people found this review helpful
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September 25, 2022
Still looking into this issue. Can you please send your order ID to nback.memory.training@gmail.com so that a refund can be issued? Thanks! - E.A.L.

What's new

-bug fixes