Debuting at TechCrunch Disrupt SF 2012, Chronos is a new time-tracking application for iPhone that shows you how you spend your time as well as who you're with, where and when, so you can set goals for yourself. Using the built-in sensors on the iPhone like the compass and accelerometer, for example, in combination with location databases from Google and Foursquare, Chronos can track whether you're at the office, at home, at the gym, a restaurant, a bar, or anywhere else. The clever thing here is that the app tracks your activity passively by simply running in the background on the phone, then automatically categorizing the hours you log appropriately ("work," "exercise," etc.). You can also optionally connect with Facebook to compare your activity with select friends.