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Reaction time, memory, attention and typing speed. Every test takes under two minutes, gives you one honest number, and shows you exactly where that number sits.

Start with reaction time Browse all 18 tests

A measurement, not a diagnosis. Practice improves the task you practised. We will never tell you it makes you smarter.

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Median reaction timeReaction Time TestClick the moment the canvas lights up. Five trials, median score.Digit spanDigit Span TestDigits appear one at a time. Type them back. The list grows until you break.Stroop interferenceStroop TestName the colour of the ink. Ignore what the word says. It will not let you.Net typing speedTyping Speed TestOne minute of real prose. Net words per minute, errors subtracted.Sequence lengthSequence Memory TestRepeat the sequence. It gets one step longer every time you are right.

By domain

5 testsReaction Time TestsFive ways of measuring the gap between a signal and your finger.5 testsMemory TestsFive tasks that find the point where your short-term memory gives out.4 testsAttention TestsFour laboratory tasks that catch attention in the act of failing.4 testsInput Speed TestsHow fast your hands actually are, in clicks, words and targets.

What is different here

Measurement

We start the clock when the stimulus reaches your screen, not when the code decides to show it. Responses under 100 ms are thrown out as guesses. Your score is your middle trial, not your luckiest one. The methodology page says exactly what we can and cannot measure in a browser.

Comparison

Every score is placed against a distribution, and we name its source. We have published no figures of our own yet. A norm needs at least 1,000 results before it means anything, and we will not print a sample size we do not have.

Claims

Practice makes you better at the test you practise. Whether that carries over to anything else is unsettled, and the evidence mostly says no. Nothing here diagnoses anything, and nothing here measures your brain age.

Numbers and reading

DataAverage Reaction Time by AgeThe age curve, what drives it, and why the slope is gentler than folklore suggests.DataWhat Is a Good Digit Span?Percentiles for forward and backward span, and what a high score actually means.DataAverage Typing SpeedWhere 40 words per minute actually sits, and what the number is worth.ArticleWhat Is a Good Reaction Time?The honest answer, the hardware caveat, and why the popular figure is wrong.ArticleHow Working Memory WorksThe loop, the sketchpad, the four-item limit, and why your two spans disagree.ArticleThe Stroop Effect ExplainedNinety years of a very robust finding, and the claims it will not support.