Compatibility Hub (compatibility.work) is a free online platform for personality and relationship compatibility tests. Take the MBTI compatibility test, Big Five (OCEAN) test, Enneagram quiz, attachment style quiz, love language test, zodiac compatibility test, moon phase test, SBTI personality test, and Communication Check-In for couples. No signup, no paywall — get instant results with optional AI-powered insights. Available in 17 languages with privacy-first local storage. Whether you're exploring self-growth or decoding a relationship, get science-informed, actionable answers in minutes.