How Huekle measures your color perception
What the numbers mean, how they're worked out, and where they stop.
Every Huekle game ends with some kind of score. Before you read too much into one, here's the honest frame: each result is an informal, on-device estimate of how you did on that task, right then, on that screen. It's a practice tool giving you feedback, not a clinical measurement of your color vision. Keep that in mind and the numbers become genuinely useful. Treat them as lab results and they'll mislead you.
The one caveat that changes everything: your display
Start here, because it colours the rest. Two shades that look clearly different on one screen can look nearly identical on another. A phone on low brightness, a laptop in an uncalibrated color profile, an older panel, a warm "night" tint — each one shifts what actually reaches your eye. The lighting in your room matters just as much: sunlight, a warm lamp, or glare on the glass all change how a color reads. And people see color differently to begin with, which is normal rather than a fault (the guide on color vision differences covers that).
Huekle can't see your screen or your room, so it can't correct for any of this. What it means in practice: your absolute numbers aren't comparable across devices. A difference you catch easily on a calibrated monitor in a dim room might be invisible on a bright phone outdoors, even if your eye is exactly as good. Don't compare your score to a friend's on different hardware, and don't compare your own scores across a device switch or a big change in lighting. The fix is simple: stay on one screen in similar light and watch how you change over time on that setup. If your display lets you pick an sRGB color profile and a steady brightness, that helps too.
What the games actually measure
Huekle's games fall into a handful of families, each probing a different piece of color perception. They borrow their logic from tasks used in perception research, adapted into something you can finish in about a minute.
- Detection (JND). Two shades appear, and you say whether they differ, or pick the odd one out. This estimates your just-noticeable difference: the smallest color gap you can reliably tell apart. Smaller is keener.
- Matching. You reproduce a target color, adjusting toward the hue, saturation, or lightness asked for. The game compares the color you produced against the one asked for.
- Reproduction from memory. A color or sequence shows, it disappears, and you repeat it back. This leans on how well you hold a color in mind once the reference is gone.
- Ordering. You arrange shades into a smooth gradient, testing whether you can rank color differences you might not be able to name.
- Interpolation. Given two anchors, you find the color that sits between them, like the shade halfway between two others.
- Real-time control. You keep a shifting color matched to a target as it drifts, so the score reflects how long you stayed locked rather than a single choice.
The units, and how scoring works in principle
Different families call for different yardsticks. A detection game reports a threshold: the smallest color difference between two shades that you handled reliably. Because raw RGB steps don't match how the eye actually perceives distance, expressing this as a perceptual color difference (a Delta-E-style measure) makes more sense, and it lets light and dark colors share one scale — the guide on Delta-E and the just-noticeable color limit explains it. Matching and reproduction games report closeness to a target, often as how far off you were in perceptual distance. Real-time games report time on target. And several games track a streak, the run of correct calls before your first clear miss.
The scoring idea underneath most of them is the same. The game nudges the difficulty toward the edge of what you can do, then reads off where that edge falls. In a detection game, it makes the two shades closer when you're right and further apart when you're wrong, homing in on the smallest gap you can still catch. That converged gap is your threshold for the session. In a matching or interpolation game, the score is just how near you landed to the correct answer. There's no curve grading you against other players. It's you against the task.
| Game family | What it estimates | Rough unit |
|---|---|---|
| Detection (JND) | Smallest color difference you can reliably tell apart | Threshold, as perceptual distance (Delta-E) |
| Matching | How close your color is to a target | Perceptual distance off, or % off in HSL |
| Reproduction from memory | How well you hold a color once it disappears | % drift from the original |
| Ordering | Whether you can rank shades into a gradient correctly | Correct placements, streak |
| Interpolation | Whether you can find a color between two anchors | Distance off from the midpoint |
| Real-time control | How long you keep a drifting color matched | Time on target |
Difficulty adapts to you
Most games don't sit at a fixed level. They watch how you're doing and adjust: get several right and the task tightens, slip and it eases back. That keeps you near the boundary of your ability, which is both where practice pays off most and where the measurement is most informative. It also means the game meets a first-timer and a trained designer at their own edges rather than boring one and crushing the other. The flip side is worth stating plainly. Because the difficulty moved to find your edge, the final number reflects that adaptive search, not a single fixed test everyone takes identically.
What a score does not mean
Being clear about the limits is the point of this page. A Huekle result is not a diagnosis of anything, and it is not a clinical color-vision test. It is not an Ishihara plate, and a low score tells you nothing medical about whether you have a color vision difference. If you're curious about how your color vision compares, or you have a specific concern, see an eye-care professional rather than reading it off a game. A Huekle result also isn't a fixed verdict on your ability. Any single session is noisy. Sleep, screen, room light, focus, and the display itself all push a result around. One low score doesn't mean you're bad at color, and one great score doesn't mean you've arrived. Your "true" ability is not a number you got on a Tuesday.
How to read repeated measurements
This is where the tool earns its keep. Don't fixate on today's number. Play on a regular schedule, keep the same screen and similar lighting, and watch the trend across days and weeks. A single point tells you almost nothing; a line sloping the right way over a couple of weeks tells you a lot. Expect wobble from day to day even as you improve, and judge progress by the direction of the cloud of points, not by whether today beat yesterday. If you want the deeper theory behind the perceptual thresholds, the guide on Delta-E and the just-noticeable color limit goes into it, and the broader picture lives in how many colors humans can see.
More about the project
- Editorial policy: how guides are written, sourced, and kept modest.
- Corrections: how mistakes get reported and fixed.
- About the author: who builds and maintains Huekle.
- About Huekle: what the site is and how it works.
- All guides: the full library of color and perception articles.