Critical Thinking University 'Think-O-Meter'
Developed by education big-wig Pearson, this app specifically looks to improve critical thinking skills, stating that only 28 percent of college grads are rated as excellent in this area. Its format is quite different from most other apps in the brain training genre. Instead of games, it uses written scenarios and associated questions to test users on their ability to separate facts from assumptions and irrelevant information. [free; iOS]