Speed
Reaction Time Test
Click the moment the screen turns green. Five attempts, and your score is the median.
Take the test →about 40 seconds · no sign-upReaction · Memory · Attention
Free brain tests you can take right now.
Free brain tests and puzzles with no sign-up: measure your reaction time, digit span and attention, see how your result compares, and keep your own history in the browser.
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All tests →Short-term memory
Digit Span Test
Digits appear one per second. Type them back in order — the list grows until you miss twice.
Take the test →about 150 seconds · no sign-upAttention
Schulte Table
Find the numbers 1 to 25 in order, as fast as you can, without hunting around the grid.
Take the test →about 60 seconds · no sign-upLatest articles
Browse all →Featured
Do Brain Training Games Actually Work?
You get better at the game you practise. Whether that carries over to anything else is still unsettled — and one company paid two million dollars for overstating it.
Guide
Why the Same Test Gives You a Different Result Every Time
Your own attempts vary by about 40 milliseconds even within a single sitting. That is measured, expected, and the reason one run should never be treated as your number.
Guide
How Many Numbers Can You Hold in Your Head?
Six or seven digits for most adults — and the famous “seven” is a rule of thumb about chunks, not a hard limit. What the number depends on and how to measure your own.
Guide
Is a 250-Millisecond Reaction Time Bad?
A 250-millisecond result is close to ordinary for an adult, and part of it belongs to your screen rather than to you. Where the number sits, why it moves, and what it cannot tell you.
Guide
The Memory Palace: How to Use the Method of Loci
The oldest memory technique on record turns your spatial memory into storage for anything you choose. Here is how to build your first palace and where the method genuinely helps.
Guide
Nootropics and Brain Supplements: What the Evidence Says
The brain supplement market is enormous and the evidence behind it is thin. Here is what has genuine support, what does not hold up, and how to read the claims on the label.
Guide
Neuroplasticity: How Your Brain Rewires Itself
Your brain is physically different tonight than it was this morning. Here is what neuroplasticity really means, what drives it, and where the popular version of the idea goes wrong.
Guide
Does Caffeine Really Help You Focus?
Caffeine is the most used stimulant on earth, and what it does is narrower than most people assume. Here is the difference between being sharper and merely being less tired.
Guide
Brain Fog: What Causes It and How to Clear It
Brain fog is not a diagnosis, it is a symptom with a short list of usual suspects. Here is how to work out which one is yours and what actually clears it.