Reaction Time Test — How Fast Are Your Reflexes?

A reaction time test measures the milliseconds between a visual cue and your response — here, the moment a red panel flips green and the moment you click. We average five rounds (single rounds lie), track your all-time best, and rank you against the human median of 273 ms. The F1 Lights mode recreates a Formula 1 race start: five red lights, an unpredictable hold, then lights-out — the same test that separates race drivers from the rest of us at 300 km/h. Free, no download.

Classic: the box turns red — wait. The instant it flips green, click (or smash Space). Click too early and the round restarts; the marmot judges you. You get 5 rounds and your average decides your rank on the speed bar.

F1 Lights: just like a Formula 1 race start — five red lights come on one by one, hold at full red, then go dark at a random moment. React to lights out. Jump starts are penalized, Verstappen.

For reference: the median human reaction time to a visual cue is about 273 milliseconds. Under 200 ms is elite territory — and if you're consistently under 150, close this tab and go get scouted by an esports team.

• Don't predict — react. Guessing the green costs you a reset; twitchy anticipation is slower on average.
• Soft focus on the whole panel beats staring at one point; your peripheral vision detects change faster.
• Hardware matters: a 60 Hz screen or laggy mouse adds 20-50 ms. Rematch your friends on equal gear.
• Sleep, caffeine and time of day all move your average — test at your peak, brag responsibly.