Sapiens Test

5 min read

Are online IQ tests accurate? How to tell a real test from a scam

Search for “IQ test” and you get two kinds of results. One is Mensa’s practice puzzles, which say upfront that the score is just for fun. The other is a long list of sites that let you solve thirty puzzles and then ask for your card number before they show the result. Real tests exist somewhere in between, but they are rare, and the reasons have more to do with money than with science.

What an IQ score is

An IQ score is a rank, not a measurement like height or weight. A test counts your correct answers and compares that count with a norm group: a large number of people who took the same items under the same conditions. The scale is set so that the average of that group is 100 and the standard deviation is 15. A score of 115 means you did better than about 84% of the norm group. A score of 130 means better than about 98%.

That has a simple consequence. A test without a norm group cannot give you an IQ at all. It can give you a count of correct answers, and anything on top of that is a number somebody made up.

Why so many tests use matrices

The classic format is Raven’s Progressive Matrices, published by the British psychologist John C. Raven in 1938. You see a 3×3 grid of shapes with the last cell missing and pick the piece that completes the pattern. There are no words and no arithmetic, so the result depends less on schooling and language than with most other tests. That is why matrices became the standard way to measure fluid reasoning, the ability to spot a rule you have never seen before.

The rules behind a matrix are simple: a shape rotates, the number of dots grows by one in each row, a fill changes from empty to striped to solid. Simple rules can be generated by software. In 2010 researchers at Sandia National Laboratories published a program that builds Raven-style matrices, together with norms for the items it produced. Psychologists have also released free items for research, such as the International Cognitive Ability Resource (ICAR), which includes a set of matrices.

So why is a good free test so hard to find?

There are three reasons, and none of them is technical.

The famous test can’t be online. Raven’s matrices are a commercial product sold to qualified professionals. Psychologists are bound by an ethics code that tells them to protect test materials, so the real items are kept off the internet on purpose. Anything online that calls itself “the Raven test” is at best a copy of the format.

Items are cheap, norms are expensive. Generating a thousand matrices takes an afternoon. Finding out how hard each one is takes thousands of people solving them under the same conditions. Researchers do that work for papers, not for a website, and they don’t buy search ads.

Scams pay better. Truth in Advertising described a typical case in March 2026: a “free” six-minute IQ test advertised on Google, a $1 charge to see the score, and fine print that signs you up for $30 a month unless you cancel within seven days. A site that earns $30 a month from one visitor can outbid anyone for ads on “IQ test”. An honest test that earns nothing cannot.

Mensa’s free online challenge is the honest exception near the top: 35 puzzles in 25 minutes, with a note that the result is for entertainment only and won’t qualify you for membership. Mensa admits members on the basis of supervised tests.

Seven checks before you trust a score

What a free online test can honestly tell you

It can tell you how well you reason with matrices compared with the other people who took the same test, on a given day, on a screen. That is a narrower claim than “your intelligence”, and a useful one.

Norms also age. In the 20th century scores on IQ tests rose by about 3 points per decade, which is known as the Flynn effect. In Norway the trend reversed for men born after the mid-1970s. A test normed decades ago flatters or punishes you depending on which way the population has moved since.

How our test does it

Pattern is our 20-minute matrix test. Each sheet has 20 matrices from our own generator, and they get harder as you go. Your score is your rank among the first attempts of everyone who took the test. It appears on the IQ scale once 50 people have done the test, and once there are enough results you also see the reliability of the test and a 90% range around your score. Retakes get a score but stay out of the norms. No sign-up, no email, no payment.

The honest limit: our norm group is the people who play on this site, not a random sample of the population. People who take IQ tests online are probably not average, so 100 means the average player, not the average human.

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