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Number Speed Test
A number sequence flashes on screen — much faster than a normal memory test. Type it back before the timer runs out.
Start with 3 digits. Each correct answer adds 1 digit. One wrong answer — or a blown deadline — ends the test.
About Number Speed
Speeded Working Memory
Number Speed is a speeded digit span: the sequence flashes at roughly three digits per second and recall runs against a deadline. It measures how quickly your working memory can encode and replay information — not just how much it holds.
How It Differs from Digit Span
In the classic Digit Span test, digits appear one at a time at a comfortable pace and you recall them untimed. Here both ends are compressed, so most people score 1-2 digits below their relaxed span. Most adults manage 5-7 digits untimed; 9+ under time pressure is exceptional.