Free IQ Tests and Real Analysis: what "free" hides, and a dated audit of four competitors
A dated audit of what free IQ tests cost, from a one-dollar trial that renews at $29.99 every 28 days to competitors that charge nothing at all.
Scoring & Methodology
Scoring & Methodology
How IQ scores are calculated, what percentiles mean, and the validity and reliability behind cognitive assessment.
The Reasoning-and-Wage Dataset: 739 Occupations, Full Method and Open Download
The reproducible dataset behind our reasoning-and-wage figure: O*NET 29.1 reasoning demand versus BLS 2024 median wages across 739 occupations, with full method and open download.
Cognitive Demand Index: 100 US Jobs Ranked by Brain Power (and What They Pay)
The Cognitive Demand Index maps IQ by occupation across 100 US jobs using O*NET reasoning data and BLS 2025 wages. See where brain power and pay diverge.
Your IQ Is a Range, Not a Number: What Confidence Intervals Really Mean
Every IQ score is a range, not a fixed number. Learn what Standard Error of Measurement means, why scores shift, and how to read your confidence interval.
Does Your IQ Predict Job Satisfaction? The Science of Cognitive Mismatch
A study of 87,229 workers shows IQ alone doesn't predict job satisfaction, but the match between your brain and your job's complexity does. See the data.
Cognitive Job Fit: What Happens When Your IQ Score Outpaces Your Role
When cognitive ability exceeds role demands, burnout and turnover spike. Learn how to identify cognitive mismatch and realign your career with your IQ profile.
Why High-IQ Workers Burn Out in Easy Jobs: The Science of Cognitive Mismatch
25% of workers are cognitively overqualified. Learn how IQ scoring science explains why easy jobs cause burnout and how to find your sweet spot.
What Your IQ Subscores Reveal About Your Ideal Career Path
Your IQ subscores predict career fit better than a single number. Learn how verbal, perceptual, memory, and speed profiles map to ideal roles.