Personality types explained: INFJ, INTJ and how much to trust the letters
Plain-language profiles of personality types: what the four letters claim, what people of each type commonly report, which parts survive research scrutiny, and where the stereotypes fail. No sign-up, no test to sell, and an honest page on how reliable the framework is. Updated 2026-10-13.
INFJ
Introversion, Intuition, Feeling, Judging. Traits, strengths, myths, and a 12-item self-check.
Read the profileINTJ
Introversion, Intuition, Thinking, Judging. The "mastermind" myth and what holds up.
Read the profileINFJ vs INTJ
The pair that mistypes as each other most: the differences that matter.
CompareHow reliable is MBTI?
Retest stability, false dichotomies, the Big Five, the Barnum effect, and how to use type anyway.
ReadINFJ in depth
Careers · Relationships and compatibility · Weaknesses · INFJ-A vs INFJ-T
INTJ in depth
Careers · Relationships and compatibility · Weaknesses
How these pages are written
- Each claim is sorted into three bins: measurable (overlaps with Big Five research), commonly reported (consistent self-descriptions), or interpretation (the "advocate"/"mastermind" layer). We say which is which.
- Every profile carries the same caveat: about half of test-takers get a different type on retest; descriptions are prompts for reflection, not verdicts.
- More types will follow at the same depth; we would rather publish two honest profiles than sixteen thin ones.
Earlier essays on consciousness and physics remain in the essays archive.