Crystal is a tech startup that scrapes the web for a person's online information to analyze his or her personality. Its purpose is to help people interact more effectively with one another. The founder, Drew D'Agostino came up with the idea for Crystal to suit his own needs.
A unique product - haven't really seen anything like it before. But I get a lot of value from using Crystal to better prepare to interview a candidate, pitch an investor, or sell to a prospective customer. It is almost always helpful and accurate when it comes to personality-based guidance to inform how best to communicate with someone via email or on a call / meeting.