Dual N-Back: Brain Training is a free iPhone app developed by Lindware OU. This app is designed to improve your working memory, which is responsible for holding and manipulating information in your brain. Scientific evidence supports the effectiveness of this exercise in significantly boosting working memory.

Based on multiple studies, enhancing the brain's working memory has been shown to increase fluid intelligence. Dual N-Back offers the same exercise that test subjects perform during experiments, mimicking the rules and mechanics as closely as possible.

In addition to the brain training exercises, Dual N-Back offers competitive features such as Game Center integration and leaderboards, allowing you to challenge yourself and compare your progress with others. The app also provides configurable reminders to help you stay on track with your brain training regimen. Furthermore, Dual N-Back offers extensive statistics to analyze your progress and track your improvement over time.

One of the notable features of Dual N-Back is that it does not require an internet connection for most of its features, allowing you to train your brain anywhere, anytime. So if you're looking to improve your working memory and boost your fluid intelligence, Dual N-Back: Brain Training is a great app to try.