Reaction Time Test. Measure your reflex speed in milliseconds with our free online test Free reaction time test online. Click as fast as you can when the screen turns green. Measure your average reflex speed in milliseconds — no signup.
Mind Skills Arcade is a free brain training arcade with 50+ science-inspired mini games covering memory, logic, math, focus, reaction speed, typing and language. Every game runs instantly in your browser — no signup, no download, no install. Train daily for a few minutes to build a sharper, faster mind.
Browse our category hubs and start your daily practice with the most popular tests including Dual N-Back, the Stroop Test, classic digit span, Sudoku, the Typing Test and the Reaction Time Test. New games and guides are added every week.