While not quite palm-reading, scientists have long correlated behavior with the length of your fingers. In particular how long your pointer finger is relative to your ring finger seems to indicate how much testosterone you were exposed to in utero. There are many conflicting reports on what this ultimately means — but your ratio may be able to predict how well men can communicate with women, likelihood of going prison, sexual orientation, etc.
This app will take a picture of your hand and let you determine your ratio and interpret what this means.
Links: Coming Soon
Tim Riedel, Veronica (2015)