What a person does on their phone call tell you a lot about them -- including their GPA. Researchers from Dartmouth College and the University of Texas at Austin have developed an app that tracks smartphone activity to compute a grade point average that's within 0.17 of a point. The software is called smartGPA and using it alongside "periodic self reports" keeps tabs on how hard a student is studying and partying -- on top of physical activity, sleep, attendance and social interactions. Members of the research team were also responsible for the StudentLife app that kept up with mental health and its effect on grades, and this goes a step further by taking into account a broader picture of daily life. "We show that there are a number of important behavioral factors automatically inferred from smartphones that significantly correlate with term and cumulative GPA," the study explains. Installing the app, which is built with cloud and machine learning algorithms, monitored a group of undergrads 24 hours a day for 10 weeks.