This app allows you to test your reaction to both light and sound. After starting each test, the user will be prompted to tap the button after a random time somewhere between 1 and 6 seconds. Depending on the user's choice, this prompt will either be a "beep" or a visual prompt. The user's total reaction time is then displayed. You can also challenge your friends in the head-to-head mode. Decide who pays the bill, settle a bet, or just see who has the quickest reflexes. This bare-bones app cuts down on anything that would affect performance, measuring reaction times accurate down to the millisecond.