A short, free color discrimination test that measures how subtle a difference your eyes can detect. The board fills with cells of nearly identical color and you tap the one that is slightly off. Each correct answer raises the difficulty.
How to play
Find the single cell whose shade differs from the rest before the timer runs out. Stages get harder by shrinking the color difference and growing the grid. Three wrong taps end the game. Your final stage is your score — anything past stage 12 puts you in the strong-discrimination range.
What this test does and does not show
It measures contrast sensitivity at random RGB points, which correlates with everyday color perception. It is not a clinical test for color blindness — those use specific pseudoisochromatic plates (Ishihara). If you struggle disproportionately with red/green or blue/yellow boards, it is worth seeing an optometrist.
FAQ
- Why is one device easier than another?
- OLED, IPS, and TN displays render the same RGB value with different perceived contrast. Brightness and ambient light matter even more. Repeat on the same screen and lighting for fair comparison.
- Does practice improve my score?
- A little — your eye-brain pathway adapts to the format. After roughly five sessions, your score plateaus near your true sensitivity ceiling.
