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-upFree brain tests
Short, measurable tests you can take in the browser without an account. Each one gives you a number, explains what that number is and, where honest published data exists, tells you how it compares.
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-upHow these tests work
Every test here measures one thing and reports it as a single number. Nothing is graded, nothing is interpreted for you, and no test needs an account or an email address.
Your attempts are kept in your own browser, so you can see whether today’s run was better than last week’s. Nothing is sent to a server.
Where the comparisons come from
Two of these tests show a percentile, because there are published studies that measured the same task in a large group of adults and we can link to them. The source and what we took from it are named at the bottom of each of those pages.
The Schulte table does not show one. The times quoted for it online have no traceable study behind them, and we would rather show your own history than invent a norm.
What these tests are not
They are not medical or psychological assessments. They cannot detect, screen for or rule out any condition, and no combination of runs on this site can. If something about your memory or concentration worries you, that is a conversation for a doctor.
We also make no claims about training. Scores usually improve over the first few attempts because you learn the task, and then they settle.
Questions
Do I need to sign up?
No. There is no account, no email step and no paywall on any test.
Do the tests work on a phone?
Yes, all three. The Schulte grid fills the screen width, and the digit span test has its own keypad so it does not depend on your keyboard.
Which test should I start with?
Reaction time is the quickest — about forty seconds. The digit span test takes two or three minutes and is the one people find most interesting.
Are more tests coming?
Yes. The same engine runs all of them, so new ones are mostly a matter of writing the task and finding a defensible comparison for it.