INTJ — The Architect
Ni · Te · Fi · Se
Frequently mistyped as INTP. The tell: INTJ conclusions arrive as a vision to be executed (Ni first), while INTP conclusions are built as a model to be corrected (Ti first).
Mistype self-check
Enter the four-letter result you already have and this compares that type's expected function profile against your own measured scores — showing exactly where and why the two disagree.
The tool needs a measured profile to compare against, so the test comes first. It is free and takes about fourteen minutes.
Why four letters change between sittings
A four-letter result is a summary of a summary. Each letter is a threshold on a scale, and most people sit near the middle of at least one of them — so a small change in mood, framing, or self-image on the day flips a letter without anything real having changed. Two sittings a month apart disagreeing is normal, not evidence that one of them was wrong.
The deeper problem is that the letters sit on top of a mechanism they do not describe. INFJ and INFP differ by one letter but lead with entirely different functions — Ni–Fe versus Fi–Ne — and share no dominant function at all. Two people with the same four letters can be running quite different stacks if one of them is a genuine mistype.
Function scores avoid most of this because they measure the mechanism directly. You do not have to decide whether you are "more feeling or thinking this week"; you look at which of the eight is actually carrying the load, and how large the gap is.
How the check works
1. Take the measured profile.
Ninety-six statements produce a 0–100 score for each of the eight functions.
Ninety-six statements produce a 0–100 score for each of the eight functions.
2. Build the claimed type's ideal profile.
The type you entered has a canonical stack, so its four preferred functions should score high and its four shadow functions should score low. No questionnaire is involved — this is derived from the stack ordering itself.
The type you entered has a canonical stack, so its four preferred functions should score high and its four shadow functions should score low. No questionnaire is involved — this is derived from the stack ordering itself.
3. Compare the two, function by function.
You get a stack overlap percentage, the functions that diverge most, which letters are misaligned, and how much of the gap is explained by your dominant function being different from the claimed type's dominant.
You get a stack overlap percentage, the functions that diverge most, which letters are misaligned, and how much of the gap is explained by your dominant function being different from the claimed type's dominant.
The output is diagnostic, not decorative. "Substantial mistype" is a real finding: it means the claimed stack and your measured stack disagree on which functions lead, which is precisely the case worth investigating.
What the sixteen types are most often confused with
Each entry is the mistype that actually shows up in practice, and the tell that separates the two. Start with the result you already have.
INTP — The Logician
Ti · Ne · Si · Fe
Frequently mistyped as INTJ or as INFP. The tell: strong Ti wants precision, and a strong Ne shows up as rambling breadth of interest. If your inner life is dominated by values rather than coherence, look at INFP.
ENTJ — The Commander
Te · Ni · Se · Fi
Frequently mistyped as ESTJ or as an ExTP. The tell: ENTJ decisions are shaped by a long-arc strategic vision (Ni), not by established procedure (Si) or by in-the-moment improvisation (Se).
ENTP — The Debater
Ne · Ti · Fe · Si
Frequently mistyped as ENFP or as INTP. The tell: ENTP argumentation is structural (Ti) rather than value-driven (Fi), and it usually wants to win the model, not express the self.
INFJ — The Advocate
Ni · Fe · Ti · Se
Frequently mistyped as INFP or as INTP. The tell: INFJ care is organised around a vision of the other person's trajectory (Ni first), whereas INFP care is organised around the other person's authenticity and their own values (Fi first).
INFP — The Mediator
Fi · Ne · Si · Te
Frequently mistyped as INFJ or as ISFP. The tell: INFP inner life is dominated by what is right for me (Fi) plus branching possibility (Ne), while ISFP is present-tense and concrete (Se).
ENFJ — The Protagonist
Fe · Ni · Se · Ti
Frequently mistyped as ESFJ or as ENFP. The tell: ENFJ focus is on long-term potential and trajectory (Ni) rather than on current harmony and concrete needs (Si), and their warmth is directive rather than exploratory.
ENFP — The Campaigner
Ne · Fi · Te · Si
Frequently mistyped as ENTP or as INFP. The tell: ENFP decisions are finally decided by values (Fi), not by structural elegance (Ti); and they are directed outward at people and possibilities (Ne), not inward at a private compass (Fi-first).
ISTJ — The Logistician
Si · Te · Fi · Ne
Frequently mistyped as ESTJ or as ISFJ. The tell: ISTJ structure is internally anchored (Si) rather than team-directed (Fe) or improvisational.
ISFJ — The Defender
Si · Fe · Ti · Ne
Frequently mistyped as INFJ or as ISFJ/ISFP confusion. The tell: ISFJ perception is concrete and precedent-based (Si), not pattern-abstract (Ni).
ESTJ — The Executive
Te · Si · Ne · Fi
Frequently mistyped as ENTJ or as ESFJ. The tell: ESTJ decisions are anchored in precedent and established standard (Si), not in a long-range private vision (Ni).
ESFJ — The Consul
Fe · Si · Ne · Ti
Frequently mistyped as ENFJ or as ESFP. The tell: ESFJ care is aimed at concrete present needs and established expectations (Si), not at long-term potential (Ni).
ISTP — The Virtuoso
Ti · Se · Ni · Fe
Frequently mistyped as INTP or as ISTP/ISFP. The tell: ISTP engagement with reality is present-tense and physical (Se second), not speculative breadth (Ne second).
ISFP — The Adventurer
Fi · Se · Ni · Te
Frequently mistyped as INFP or as ISTP. The tell: ISFP engagement is sensory and present (Se second) rather than associational and future-facing (Ne second).
ESTP — The Entrepreneur
Se · Ti · Fe · Ni
Frequently mistyped as ESFP or as ENTP. The tell: ESTP judgement in the moment is structural and pragmatic (Ti), while reading the group is instrumental (Fe).
ESFP — The Entertainer
Se · Fi · Te · Ni
Frequently mistyped as ESFJ, ISFP, or ENFP. The tell: ESFP judgement is internally sourced (Fi second) while perception is immediate and concrete (Se first).
Better still: run the method comparison to see why function-based scoring separates these pairs at all.
Find out which of the two you actually are
Ninety-six statements, four short chapters, about fourteen minutes. Free, no account, nothing leaves your device.
Take the test