US$15
They say that repeatedly doing IQ tests will improve your IQ score and make you look like a genius in test-based job applications. They also say that online or app-based tests are tipped to flatter your ego by awarding you a generous result; after all, the developers have nothing to lose.
My Dr Reichel's IQ Test score did not especially flatter my ego, and doing the test is so turgid you have to believe that it is at least close to the real thing. If it improves your IQ, then this is a useful way to spend 45 minutes.
Dr Wolfgang Reichel, the introductory text explains, is one of the most renowned IQ experts in Europe and the author of several books about aptitude and IQ tests. This app has 13 sections that test a range of mental abilities from spotting the odd word out, through completing visual and numeric series to memory testing.