Reaction Time by Country | Live Global Millisecond Leaderboard

Aggregated reaction-time medians from verified runs across 180+ countries. Updated daily, ranked, with country flags and percentile distributions.

Why Country-Level Reaction Data Matters

Sleep patterns, screen culture, gaming infrastructure and average age shift national reaction medians by 15–40 ms. SERO's anonymized dataset shows the live ranking in real time.

Top of the Ranking (current snapshot)

South Korea, Japan, Singapore, Sweden and Denmark consistently land in the top 10 — driven by youth demographics, broadband quality and gaming penetration.

Add your country to the ranking

FAQ

How is the country score calculated?

Median of all verified runs from that country over the last 30 days, weighted to filter outliers.

Is my data anonymous?

Yes — only aggregate medians are published, never individual identifiers.

How do I represent my country?

Run the test once and set your country flag in your profile. Every run feeds the global median.