The N-Back Challenge is a free iPhone app that offers a unique cognitive training program called "dual n-back" to help raise your IQ. Based on scientific studies published in top peer-reviewed journals, this program is designed to provide powerful benefits in just a few minutes per day.

Intelligence is crucial for learning, reasoning, problem-solving, and making connections. Higher IQs have been linked to improved academic achievement, professional success, and better health. With just 7 hours of total training time, the N-Back Challenge may be the best investment of your time.

The N-Back Challenge is scientifically sound, with the founders aligning the app with prevailing research. You can track your progress, build streaks, and compare yourself to other learners. Compete against friends with leaderboards for motivation and customize your experience with different voices, languages, and settings.

Parents can give their children an edge by encouraging them to complete the N-Back Challenge. It's also beneficial for grandparents to fight cognitive decline and knowledge workers to enhance productivity. Teachers can prepare students for rapid technological change and problem-solving skills.

The app is free, but if you miss a session, you can support the developers by buying a "coffee" or earn it by inviting friends. Additional resources and customer support are available on the website.