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Improve Your IQ with Proven Method

By 14773 STONES

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Scientifically designed brain fitness tool to improve memory, attention and processing speed.

"Forget Brain Age: Researchers Develop Software That Makes You Smarter" - WIRED, April 2008

- Short URL:

"Improving fluid intelligence with training on working memory" - The National Academy of Science of the USA, Feb 2008

- Short URL:

▶ Best implementation of dual n-back on iPhone.

▶ Improve your intelligence:

- Ability to reason and solve new problems
- A wide variety of cognitive tasks
- Efficiency in learning
- Closely related to professional and educational success.

▶ Features

- Tips for sharp brain
- Difficulty levels from 1 to 9
- Supports 1, 2, 5, 10, 20 sessions mode
- Supports Audio or Video only mode, too
- Statistics on your progress
- Visual feedback during sessions
- Tutorials

▶ Help

- Press (i) Button in the Menu Screen

▶ For more information

In psychology, fluid and crystallized intelligence (abbreviated Gf and Gc, respectively) are factors of general intelligence originally identified by Raymond Cattell.

Fluid intelligence is the ability to find meaning in confusion and solve new problems. It is the ability to draw inferences and understand the relationships of various concepts, independent of acquired knowledge.

Crystallized intelligence is the ability to use skills, knowledge, and experience. It should not be equated with memory or knowledge, but it does rely on accessing information from long-term memory.

Dual n-back

The dual n-back task was proposed by Susanne Jaeggi et al. in 2003. In this variation, two independent sequences are presented simultaneously, typically using different types of stimuli, such as one auditory and one visual.

In a 2008 research paper Jaeggi et al. claim that practicing a dual n-back task can increase fluid intelligence, as measured in several different standard tests. This resulted in some attention from popular media, including an article in Wired.

In 2009, it was reported in Science that '14 hours of training over 5 weeks' led to measurable density changes for cortical dopamine neuroreceptors.

from Wikipedia

▶ Follow us on Twitter! We are at

▶ Keyword: Boost IQ, Maintain Brain Fitness, Improve Productivity, Concentration

What's New in Version 2.1

- Bug fix (Crashes while loading)
- Engine updated

iPhone Screenshot

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Customer Reviews

Great app! ...with Suggestions

Very good, clean and straightforward implementation... with lots of user controllable options. Definitely recommended.

My only suggestion is that to me the woman's voice sounds nearly the same on "s" and "f". Can you just delete one of them on the next update? Also, I would like if the audio/video buttons had a setting to reverse their position (to make this app consistent with other trainers I use to avoid boredom)

Overall - outstanding! Thanks.


This is the best dual n back on the iPhone! I've tried them all. This one has reaction times and also a picture version comined with sounds in addition to the jaeggi task.

Very good stats with reaction times for each modality.

Improvements would be to 1) eliminate the annoying intro sound (only played at startup),2) allow more phonemes, and 3) allow customization of block length, and 4) show more stats like "false positives" and "false negatives".

Highly recommended though, well worth the money and definitely the best available!!


What a great app for training your brain. It's straight forward. If only you would update the graphics. Lol. But the core of the game needs no change. It does what it's supposed to do. It's challenging alright but very rewarding. Thank you for this.

Improve Your IQ with Proven Method
View In iTunes
  • $0.99
  • Category: Productivity
  • Updated:
  • Version: 2.1
  • Size: 2.6 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 2.2 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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