How fast are you? Find out in ten seconds.
Click when the panel turns green. You get your reaction time in milliseconds, plus how much of it was your screen rather than you. 10 quick tests, nothing to sign up for.
Reaction time · one try
The panel turns red, then green after a wait you can't predict. Hit it the instant it goes green — click, tap, or press Space.
Nothing is saved or sent. It all runs in your browser.
Or pick a different test
Each takes under two minutes and gives you one number.
Memory
- Sequence Memory TestWatch the blocks light up, then tap them back in order.blocks
- Number Memory TestHold a growing string of digits, then type it back.digits
- Verbal Memory TestSay whether each word has appeared before.d′
- Visual Memory TestReproduce a pattern after a three-second look.cells
- Chimp TestTap the numerals in order once they're hidden.numerals
What your result looks like
Example, not a real result
The lit part is the most a 60 Hz screen alone could add: 16.7 ms. Your mouse or keyboard adds more, which a web page can't measure.
All five tries: 251 · 238 · 274 · 243 · 262 ms
Latest guides
- Remembering a pattern or describing it? What Visual Memory can’t tell
- Why Verbal Memory reports d′, not a streak of correct answers
- What chunking does to a digit span — and to your Number Memory score
Why there's no ranking
Other sites tell you what percent of people you beat. We can't say that honestly: we don't know who took the test or what they used. So you get your real number, and a published range only where research has measured the same task. None of this is a cognitive assessment, and your equipment is in every reading. How this site works →