Color Hue Perception Test
Drag the color chips until each row is a smooth, even gradient. The chips at both ends are locked to show you the direction. When you're done, hit Check — the lower your error score, the sharper your eye for hue.
Ends are locked. Drag the middle chips into order. On a keyboard: focus a chip and use ← →, then Enter to check.
This is a fun perception game, not a medical or clinical vision test.
What does the error score mean?
Every chip in a row is the same brightness and the same saturation — only the hue changes. That means you can't lean on light and dark to sort them; you have to read the hue itself. Your score adds up how far each chip's color sits from the chips beside it, so a perfectly even gradient scores zero. Swap two nearly identical neighbors and the score barely moves; drop a color far from where it belongs and it climbs fast.
Scores depend on your screen and your lighting as much as your eyes, so the most useful comparison is against your own past runs — or against a friend on the exact same board. Start on Easy to learn the feel, then work up to Hard, where the hue steps get tiny.
Frequently asked questions
How does the color hue test work?
Each row is a slice of the color wheel where only the hue changes — brightness and saturation stay the same, so you can't cheat with light and dark. The two end chips are locked. Drag the middle chips until the colors step evenly from one end to the other, then hit Check. Your score adds up how far each chip's colors are from its neighbors — lower means a smoother, more accurate gradient.
What's a good score?
Zero is a flawless sort. Most people land a little above zero, especially on Hard, where the hue steps are tiny. Try Easy first, then work up. Scores depend on your screen and lighting too, so compare yourself over time rather than chasing a single number.
Is this a real color-blindness test? Is anything uploaded?
No on both. It's a playful perception game, not a medical or clinical diagnosis — see an eye professional for that. And nothing is uploaded or tracked: the whole test runs in your browser with a bit of math, and the colors and your score never leave your device.