Guides & How-tos · Worked examples · Real numbers

Personality guides

Step-by-step how-tos, head-to-head comparisons and honest roundups — every guide worked through with current figures, then backed by a RECATOOLS calculator or AI-directory entry so you can act on it.

498 guides published 17 topic areas Latest guide Oct 2026

All 498 Developer Tools 68 AI & ML 63 Finance 52 Home & Living 46 Chinese Culture 43 Personality 9

A gloved hand holding a bag of donated blood beside collection equipment

Personality 6 min

Blood type explains almost none of the variation in large Japanese and US surveys

The belief that ABO blood type shapes temperament and compatibility has been popular in Japan since a 1971 book. In surv...

Amelia Wong

Pub. 7 Oct

An hourglass with red sand running into the lower bulb, standing on a newspaper

Personality 6 min

Types of procrastinators, and what the one real test found

The arousal, avoidant and decisional procrastinator types are the only typology we found that has been put through a lar...

Amelia Wong

Pub. 29 Sep

A fountain pen nib resting on paper beside a bottle of ink

Personality 5 min

Why two websites give you different life path numbers

Numerology has two standard ways of doing the arithmetic, and for about one birthday in eight they disagree. The dispute...

Amelia Wong

Pub. 31 Aug

Two colleagues in dark jackets at an office desk, one standing and pointing into an open notebook while the other, seated at a laptop, looks at the same page.

Personality 7 min

What a DISC Profile Is Actually Shaped Like

Across all 83,521 possible results from our DISC test, the top two traits are within a point in 31%. Because ties break...

Amelia Wong

Pub. 16 Aug

A hand holding a red pencil fills in one of the small oval bubbles on a printed multiple-choice answer sheet lying on a pale wooden desk.

Personality 7 min

How Stable Is Your Holland Code?

A career test hands you three letters. Across all 24,137,569 possible score sheets from our own test, the third one is d...

Amelia Wong

Pub. 16 Aug

A tennis ball resting on the white boundary line of a clay court, half on each side of it.

Personality 6 min

Why Your Personality Result Changes When You Retake It

A four-part label is two numbers passed through a threshold. We walked all 1,089 possible score pairs on our own attachm...

Amelia Wong

Pub. 13 Aug

Two hands, one lighter and one darker skinned, reaching toward each other against a soft pink sky

Personality 16 min

Attachment Styles: What Anxious, Avoidant and Secure Actually Mean

Anxious, avoidant, secure — the labels are everywhere, but unlike most personality quizzes, adult attachment has real re...

Amelia Wong

Pub. 25 Jul

Silhouettes of a diverse group of people gathered near a window in warm backlight

Personality 14 min

The Enneagram's Nine Types, Explained Without the Mysticism

A plain-English tour of the nine Enneagram types and the wings, lines and Centers around them, the real twentieth-centur...

Amelia Wong

Pub. 25 Jul

A row of colored pencils blending across the spectrum from green to red, arranged like a scale

Personality 15 min

The Big Five: The Personality Model Scientists Actually Trust (and Why MBTI Isn't It)

Four-letter quizzes made Myers-Briggs famous, but the personality model scientists actually build their research on is t...

Amelia Wong

Pub. 24 Jul