I first learned of Crystal via this WIRED post. Crystal is a service which analyzes publicly available data about your contacts, matches your contacts to one of 64 different “communicative” types, and then, via a Chrome extension, it will suggest how best to communicate with them. If you spend too much time composing emails, this service might help you get over your writer’s block.

Crystal shows you the best way to communicate with any prospect, customer, or coworker based on their unique personality.

Source: Crystal | Communicate with anyone, based on personality