Attention & Focus
Color Perception Test
One tile in the grid is a slightly different shade. Click it. Each level shrinks the colour difference and grows the grid — sixty seconds to find your limit of colour discrimination.
One tile is a slightly different shade — click it. Each level shrinks the difference and grows the grid. Find as many as you can in 60 seconds.
What this measures
This test measures colour discrimination — the smallest hue and lightness difference you can reliably detect, expressed as the level where you stop finding the odd tile within the time limit. Human colour vision compares signals from three cone types, and discrimination ability varies widely between individuals, degrades with screen quality and ambient light, and declines gradually with age. The test is deliberately fast-paced: at threshold, hesitation is itself a signal that you have reached your perceptual limit.
Where this shows up in real life
Designers, painters, QA inspectors, and anyone matching fabrics or brand colours depend on fine discrimination. Screen quality and lighting matter — compare scores on the same device.
Score guide
| Rating | Score |
|---|---|
| Exceptional | level 28+ |
| Excellent | level 23–27 |
| Above average | level 19–22 |
| Average | level 13–18 |
| Below average | under level 13 |
How to improve
- Unfocus slightly and take in the whole grid; the odd tile pops out to relaxed vision faster than tile-by-tile checking.
- Turn your screen brightness up and view straight-on — off-axis viewing on LCD panels shifts colours.
- Blink between levels. Colour adaptation is real: staring desensitises exactly the channel you need.
- If truly stuck, scan the corners; when the difference is at your threshold, systematic beats random.
Frequently asked questions
Is this a colour blindness test?
No — it measures fine colour discrimination, not colour vision deficiency. A person with normal colour vision can still have poor discrimination and vice versa. For diagnosing colour blindness, an Ishihara-style plate test administered properly is the right tool.
Does my monitor affect my score?
Substantially. Panel quality, brightness, colour depth, and blue-light filters all change how visible the odd tile is. Compare scores on the same device only.
Can colour discrimination improve?
Yes, modestly — colour discrimination shows perceptual learning with practice, and professionals like colourists and inspectors measurably outperform average observers within their trained colour regions.