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Hiq, pronounced High-Q is an app that promises to try and increase your iQ with minimal effort on your part. We do this by stimulating your brain every time you unlock your phone. Rather than just sliding or entering the same password when you want to unlock your phone Hiq will prompt you with a multiple choice question that you need to answer correctly to unlock your phone. Quick unlock mode allows you to skip hard quizzes or to skip questions when there is no time. Also set the app to only appear after a certain amount of time so questions don't come up every time the phone is unlocked.
You choose the types of questions you want to answer. You can track your progress as you get smarter as well as see stats on how you answer questions. There is also plenty of settings to adjust the app's features to your liking.
Hiq does not decrease the security of your phone. If you require a password to get into your phone the app does not override that password.