See a number, let it vanish, then type it back — every correct answer adds one more digit. Find out how long a number you can hold in your head.
Number Memory Test
See a number, let it vanish, then type it back — every correct answer adds one more digit. Find out how long a number you can hold in your head.
The Number Memory Test runs entirely in your browser. Numbers are generated on your device and checked locally; your answers and best score never leave it.
The Number Memory Test shows you a single digit, hides it after a moment and asks you to type it back. Get it right and the next number has one more digit; get it wrong and the game ends. The time on screen grows with the length — a second plus half a second per digit — and a pace setting makes it more relaxed or quicker. A progress bar shows how long is left, and a button lets you move on early once you have it. When you slip, the page lines up the real number against your answer digit by digit, marking correct, wrong and missing digits, so you can see whether you lost the middle or the tail. Numbers never start with zero unless you allow it. Everything is generated and checked on your device, and your best score stays in this browser.
Features
Starts at one digit and adds one for every correct answer
Display time grows with the number length, with Relaxed, Standard and Quick pace settings
Draining progress bar plus an I have got it button to move on early
Digit-by-digit comparison of the real number and your answer when you miss
Optional leading zeros; numbers start with 1 to 9 by default
Keyboard-first: the answer box is focused for you and Enter submits
Personal best and the last ten games saved only in this browser
Copy a one-line result to share
How to use the Number Memory Test
Pick a pace and decide whether to allow a leading zero, then press Start
Memorise the number while the progress bar runs down
Type the number into the answer box and press Enter
If you are right, press Enter again for the next, longer number
When you miss, read the digit comparison and press Play again
Example
Input
Level 7 number: 4821739
You typed: 4821793
Output
The number was 4 8 2 1 7 3 9
You typed 4 8 2 1 7 9 3
Recalled 6 digits · 5 of 7 in the right place
The comparison is position by position, so a swapped pair shows as two wrong digits.
Common errors & troubleshooting
My answer was marked wrong although all the digits were right. — Check the order and the length. Digits are compared position by position, and a number that is one digit too short or too long is wrong.
The number stays on screen for too short a time. — Switch the display time from Standard or Quick to Relaxed before you start. Each digit then gets about 50 percent more viewing time.
The answer box ignores letters and spaces. — Only digits are accepted. Anything else, including spaces you add for readability, is removed automatically as you type.
Pressing Enter did nothing. — An empty answer is ignored on purpose so a stray key cannot end the game. Type at least one digit, then press Enter.
Frequently asked questions
How many digits can the average person remember in the Number Memory Test?
Most people manage about seven digits, give or take two, which matches the classic findings on short-term memory. Chunking the number into groups of two or three digits, and a quiet environment, often add a few more.
How long does each number stay on screen?
At Standard pace a number is shown for one second plus half a second per digit, so five digits get three and a half seconds. Relaxed multiplies that by one and a half and Quick by seven tenths.
What does the Number Memory Test score mean?
Your score is the longest number you typed back correctly. If you recall six digits and then miss the seven-digit number, your score is six and the result card shows exactly which digits of the seventh went wrong.
Why does the Number Memory Test never start with a zero?
By default the first digit is 1 to 9 so you never have to wonder whether a leading zero counts. If you want the extra challenge, switch on the leading zero option and numbers such as 0482 can appear.
How does the digit comparison work after a wrong answer?
Both numbers are lined up from the left. A digit that matches is marked right, a different digit is marked wrong, a digit you left out is marked missing, and anything typed beyond the real length is marked extra.
Can I play the Number Memory Test with the keyboard only?
Yes. The answer box is focused automatically when the number hides, Enter submits your answer, and Enter on the Next level button starts the next round, so you never need the mouse.
Related tools
Chimp Test — Click numbered squares in order after they hide and see how far your working memory goes.
Visual Memory Test — Memorise a flashing pattern of squares and click them back from memory, level after level.
Reaction Time Test — Click the moment the screen turns green and see your average reaction time in milliseconds.
Typing Speed Test — Measure your typing speed in WPM with accuracy, consistency and a per-second chart.
Random Number Generator — Generate random numbers in a range, with unique values, decimals and count.
Click Speed Test (CPS) — Click as fast as you can and see your clicks per second over 1 to 60 seconds.