Reaction Time Tester

Reaction Time Tester is a free collection of 10 tools that measure how fast you actually react. Test your basic reflexes, react to F1 style starting lights, compare sound to sight, measure your aim, or use the classic ruler drop method with real physics behind it.

Every test tracks your history automatically, right in your browser, no account required. Every claim made here or on the site links back to a real source, a government agency, a peer reviewed study, or an official sporting body, never an unverified statistic.