Then, whenever you craft an email, the app prompts you to revise your words and ideas, so they sync with the reader's personality type.
Autocorrect, meet Myers-Briggs.
Crystal also suggests when to tighten your message; toss in an emoji; or use a little humor to soften things.
The end result? All your emails turn out more pleasant and pithy.
Crystal's developers claim their algorithm assigns personality types with 80% accuracy.
You can boost that accuracy, too, by answering multiple-choice questions about a colleague (such as, "If there were a conflict at work, how would he or she react?").