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16Personalities is a free online personality testing platform using the NERIS model—a hybrid of MBTI-style typology and the Big Five traits. In about 10 minutes, users complete a questionnaire and receive one of 16 distinct personality types, represented with detailed profiles and optional premium upgrades.
16Personalities employs the NERIS Type Explorer®, combining four traditional MBTI dimensions (I/E, S/N, T/F, J/P) with an additional Assertive (A) vs Turbulent (T) identity dimension—resulting in personality codes like INFJ‑A. The model integrates these with the scientifically validated Big Five framework.
No sign‑up is required; it's completely free, available in 49 languages, and has been taken over one billion times worldwide, with a 91% of users reporting accurate or very accurate results. Each type includes rich profiles covering strengths, weaknesses, career suggestions, relationship styles, and work habits—ideal for personal insight, team collaboration, and development.
Paid upgrades offer deeper insights, career paths, and team assessments via Premium Profiles and business tools. Critics argue it's not a pure MBTI test but a commercialized Big Five variation that may mislead some users. Nonetheless, it is praised for making personality typing accessible, accurate, and engaging—even attracting users to explore MBTI more seriously.
