Harman Play · Free browser game
Reaction Test
Test your reaction time for free with four modes: Classic click-when-green, Chase the moving target, Decoy (ignore red flashes) and Stroop (word vs colour). 3, 5 or 10 rounds, a grade badge, session history and the best average saved to your device.
How to play
- Pick a mode: Classic (click on green), Chase (tap the target wherever it appears), Decoy (tap green but ignore red flashes) or Stroop (tap when the ink is green, not the word).
- Click as soon as the GO appears; your time in milliseconds is recorded, and false starts are counted.
- Play 3, 5 or 10 rounds and chase the best average — grades and an improvement chart are shown with your results.
Frequently asked questions
- How is my reaction time measured?
- The GO appears after a random delay — click or tap as soon as it appears. Your time is measured in milliseconds across each round, and the average decides your grade.
- What is a good reaction time?
- Average human reaction time is around 250 ms. Below 200 ms is considered fast for videogame players.
- What are the game modes?
- Classic waits for the green light, Chase makes you tap a target anywhere on the arena, Decoy mixes in red flashes you must ignore, and Stroop flashes colour words you must judge by ink colour only.