howrareami.org calculates your statistical rarity across 5 categories: Body & Traits, Biology & Genetics, Personality, Life Experiences, and Career & Education. Every question maps to a real-world statistic from peer-reviewed research. Multiply your probabilities together and find out exactly how rare your specific combination is among 8 billion people. Free, no paywall, takes about 3 minutes per category. 50,000 quizzes taken in the first 3 days.