How to play

A number flashes and disappears, then gets typed back into the box. Tap to pause.

Watch the numberA three-digit number appears for a moment, then vanishes.
Type it backEnter what you saw and press Submit.
It growsEvery correct answer makes the next number one digit longer.
One mistake ends itYour score is the length of the last number you got right. If you miss the first 3-digit number, you score 2.

What this test measures

This test checks how many digits you can hold in order for a few seconds. Psychologists call it digit span. Most people hold the digits by repeating them silently. It is the same trick you use to keep a phone number in your head until you finish dialing it.

Span shows how much you can hold at once. It does not measure intelligence. A high score does not mean you reason well, and a low one says nothing about how fast you learn or how well you remember your own life.

When a run ends, the screen shows what you typed next to the real number. You can see exactly which digit went wrong, and we think that is the most useful part of a miss.

What counts as a good score

In Normal mode, the badge on your result follows this table. Harder modes raise your score a little before the badge is picked. We built it around George Miller's "seven, plus or minus two", so 5 to 8 digits counts as the normal human range.

Digits recalled	Badge	What it means
14 or more	Superhuman	Record territory. Getting here takes your own system for grouping digits.
12-13	Pro tier	Rare for anyone who has not trained for it.
9-11	Skilled	You reached the top of seven plus or minus two, or went past it.
5-8	Standard	Right inside Miller's range, where most people land.
4 or fewer	Needs practice	Usually a moment of lost focus or a typing slip ended the run early.

Hard mode shows each number for only 60 percent of the normal time. Its scores go into a separate record.

Real scores recorded on this site

So far, 285 runs of this test have been recorded here. Computers and phones score quite differently, so each gets its own table.

Computer (mouse)

167 runs · median 7 digits

Range	Share
14 or more · Superhuman	0%
12-13 · Pro tier	0%
9-11 · Skilled	20%
5-8 · Standard	59%
4 or fewer · Needs practice	21%

Phone (touch)

118 runs · median 7 digits

Range	Share
14 or more · Superhuman	0%
12-13 · Pro tier	2%
9-11 · Skilled	22%
5-8 · Standard	55%
4 or fewer · Needs practice	21%

Every finished run counts, so someone who plays five times adds five runs. The numbers are recounted every day, and a device table shows up once it passes 30 runs. Last updated: 1 Nov 2026.

How is this different from a clinical digit span test?

The clinical test works differently. An examiner reads the digits aloud, one per second, and you answer out loud. Here the whole number sits on screen and you type it.

Reading is not the same as listening, and typing is not the same as speaking. A slow typist can lose points to their hands, not their memory.

The published averages also come from particular groups. Iñesta and colleagues (2021) report a mean forward span of 5.36 digits (SD 1.15) in Spanish adults aged 55 to 87. A twenty-five-year-old who compares against that table will look better than they really are. Miller's famous figure also came from read-aloud experiments, so we treat any comparison with this screen version as a rough guide.

The "seven items" myth

George Miller's paper "The Magical Number Seven, Plus or Minus Two" (Psychological Review, 1956) gave the world its favorite memory number. People soon treated seven as the fixed ceiling of short-term memory. Miller was partly joking, though. He opens by saying the number seven seems to follow him through his data.

Most of the paper is about something else. It shows that packing information into groups changes how much a person can hold.

Later research says seven is too high for pure storage. When experiments block silent repeating and grouping, the space left over is clearly smaller. So your score here is raw storage plus whatever tricks you bring with you.

Chunking: how people beat their own limit

Try to hold 1 7 7 6 2 0 0 1 as eight separate digits and you will probably drop one. Now read them as 1776 and 2001, two years you know. The load falls to two items. The digits did not change, only the grouping did.

This is called chunking. It is why people who practice score far above the textbook range.

Phone numbers are the everyday example. Nobody stores 8005551234 as ten separate digits. The usual formatting splits it into groups, and each group travels as one unit. Ages work the same way. The number 42 is easier to keep as "my mother's age" than as a four and a two.

The best-known case is a college student who was also a distance runner. He practiced recalling digits in a lab for months. He learned to turn groups of digits into running times he knew, then stacked bigger groups on top. In the end his span grew to many times the normal range.

His memory itself had not grown. He had gotten better at packing digits. When the researchers switched to letters, his running-time trick stopped working, and he dropped straight back to an ordinary span.

What changes your score

Your inner voice

Most people keep digits alive by repeating them silently. How fast you can cycle through them sets your limit. Digits that sound alike tend to blur together.

Background speech

Talking nearby hurts more than music. It competes with the inner voice that is doing the repeating. A quiet room helps more than most people expect.

Typing slips

The test cannot tell a memory miss from a finger miss. Hit the key next door on a twelve-digit answer, and the run ends below what you actually held.

Display time

Normal mode shows the number for 0.9 seconds, plus 0.2 seconds for each digit. You cannot pause it, so all your reading and grouping has to happen inside that window.

The day you are having

Sleep, tiredness, caffeine and time of day all push your results around. That is a common reason two runs disagree.

Number Memory Test