What it measures: five broad dimensions of personality, often called OCEAN: Openness, Conscientiousness, Extraversion, Agreeableness and Neuroticism.
History: the model grew out of decades of lexical research (Allport, Cattell) narrowed down by Tupes and Christal in 1961, then consolidated by Goldberg, McCrae and Costa through the 1980s and 1990s into today's five-factor model. This mini-IPIP version uses Goldberg's public-domain items, shortened by Donnellan and colleagues in 2006.
Support: it is the most replicated structure in personality psychology, holding up across cultures and languages, and it predicts real-world outcomes such as job performance, health and relationship stability reasonably well.
Criticism: it describes traits without explaining what causes them, may be too coarse to capture traits like honesty or manipulativeness, and leans on English-language lexical studies that may not generalise perfectly elsewhere.
Potential insights: a useful, well-evidenced snapshot of broad tendencies in sociability, organisation, emotional steadiness and openness to new ideas, often used in vocational guidance and general self-reflection.
20 statements, mini-IPIP item pool. Rate how well each describes you.
What it measures: six broad traits: Honesty-Humility, Emotionality, eXtraversion, Agreeableness, Conscientiousness and Openness, the same five as other models plus a distinct sixth.
History: developed in the early 2000s by Michael Ashton and Kibeom Lee, after lexical studies across many languages kept turning up a sincerity and fairness factor that the five-factor model did not capture on its own.
Support: the extra Honesty-Humility factor has proven useful for predicting manipulative or exploitative behaviour, and the model has replicated well across a wide range of languages, arguably more so than the largely English-rooted Big Five.
Criticism: it has a smaller research base than the Big Five, and some argue the sixth factor overlaps considerably with low Agreeableness rather than standing fully apart from it.
Potential insights: useful for surfacing tendencies around trust, fairness and status-seeking alongside the familiar traits, which can be relevant to workplace integrity or relationship compatibility.
30 statements across six factors, for one person.
What it measures: the same HEXACO traits, taken independently by two partners, then compared for how closely their answers agree on each one.
History: draws on research into assortative mating and couple similarity, such as Luo and Klohnen's 2005 study of newlyweds, which examined how alike partners tend to be and whether that similarity relates to relationship satisfaction.
Support: studies broadly find a modest positive link between partner similarity, particularly in Conscientiousness and Agreeableness, and how satisfied couples report being.
Criticism: the research on similarity and satisfaction shows mixed, generally small effects, and similarity is only one of many things that shape relationship quality. Five items per factor is also a small basis for a correlation, so treat the agreement scores as indicative rather than conclusive.
Potential insights: shows where a couple's answers line up or diverge trait by trait, which can spark a useful conversation, though it is not a validated compatibility test.
Each partner answers privately in turn, then results are revealed together. Partner B does not see Partner A's answers.
Answer privately, then pass the device on.
Partner A's answers are locked and hidden. Hand over the device so Partner B can answer without seeing them.
Answer privately, then reveal the results together.
What it measures: sorts you into one of sixteen four-letter types across Mind (Extraversion/Introversion), Energy (Intuitive/Sensing), Nature (Thinking/Feeling) and Tactics (Judging/Perceiving).
History: rooted in Carl Jung's 1921 theory of psychological types, turned into a questionnaire by Katharine Cook Briggs and Isabel Briggs Myers from the 1940s onward as the Myers-Briggs Type Indicator, and later echoed by many similar online 16-type tools.
Support: an engaging, intuitive framework that many people find personally resonant and a good conversation starter about preferences and working styles.
Criticism: widely criticised in academic psychology for weak test-retest reliability, since people often get a different type on retaking it, for forcing continuous traits into artificial either-or categories, and for weaker predictive validity than the Big Five. It is rarely used in peer-reviewed personality research.
Potential insights: best used as a reflective, conversational tool for thinking about preferences such as sociability or planning style, rather than a scientifically validated diagnostic measure.
20 statements on four axes: Mind, Energy, Nature and Tactics.
What it measures: two dimensions, attachment anxiety and attachment avoidance, which combine into four styles: secure, anxious, avoidant and fearful.
History: rooted in John Bowlby's attachment theory and Mary Ainsworth's studies of infant-caregiver bonds, extended to adult romantic relationships by Hazan and Shaver in 1987, then refined into the two-dimension, four-style model by Bartholomew and Horowitz in 1991.
Support: one of the most robust and widely replicated frameworks in relationship psychology, with strong links to relationship satisfaction, conflict style and emotional regulation.
Criticism: attachment style is not perfectly stable over time or across relationships, self-report cannot fully capture the unconscious patterns studied in developmental research, and the four categories are somewhat arbitrary cut-offs on what are really continuous dimensions.
Potential insights: can highlight patterns in how you approach closeness, independence and reassurance in relationships, often a useful starting point for self-reflection or a conversation with a partner.
16 statements on two dimensions, anxiety and avoidance, which combine into one of four styles.
What it measures: two motivational systems, promotion focus (oriented towards growth, aspiration and gains) and prevention focus (oriented towards safety, duty and avoiding losses).
History: developed by Tory Higgins from the mid-1990s as regulatory focus theory, building on earlier approach/avoidance motivation research.
Support: well supported experimentally, with consistent links to risk-taking, decision speed and creativity under promotion focus versus thoroughness and error-avoidance under prevention focus, and used widely in consumer and organisational psychology.
Criticism: promotion and prevention focus can shift with context and framing, so a trait-style questionnaire like this only partly captures someone's momentary motivational state, and the model is far less well known publicly than the Big Five or 16-type frameworks.
Potential insights: useful for understanding whether you are generally more energised by chasing opportunities or by guarding against risk, which can inform how you respond to goals, deadlines and feedback.
12 statements on two motivational systems, promotion and prevention, which combine into a focus profile.