反応時間テストについて

ReactionTimeTestOnline.comは、反応時間を測定・改善するための無料ツールです。アスリート、ゲーマー、研究者、自分の反射神経が気になるすべての人のために作られています。

Our Mission

We believe everyone should have access to free, accurate tools to measure and improve their cognitive performance. Reaction time is one of the most fundamental measures of neural processing speed, and we want to make it fun and accessible for everyone.

How We Measure

Our test uses performance.now() — a high-resolution timer built into modern browsers — to measure the exact time between the screen turning green and your click. This provides millisecond-accurate results.

Note: Browser-based tests may have a slight overhead of ~1–10ms due to rendering pipelines, but this is consistent across tests and does not affect relative comparisons.

Privacy

All your test data is stored locally in your browser using localStorage. We do not collect, store, or transmit any personal data to our servers. Your results stay on your device.

Who Uses This Test?

  • Gamers training to improve their in-game reaction speed
  • Athletes measuring their neural response time
  • Researchers and students studying human cognition
  • Curious people who want to know how fast they are
  • Coaches assessing athlete readiness