Pplkpr
You let your phone manage your contacts, appointments, and even your health, so why not let it manage your relationships, too? Pplkpr uses GPS and a heart rate wristband to determine your emotional state around specific friends. As a result, it can tell you who makes you the most anxious, the most excited, the least bored, and so on, giving you a better idea of which friends you should maximize your time with and which friends you might want to make less frequent appearances in your life.
