Blog
Notes on color perception, color vision, and the science of spotting subtle differences.
Can You See the Difference? A Quick Color Perception Challenge
How small a shade difference can you actually see? A quick look at the limits of human color perception — and a game that pushes them.
Reaction Time, Visual Attention, and Why Fast Games Feel Good
Average human visual reaction time is around a quarter of a second. Here's what that number means and how fast color games sharpen visual attention.
Hue, Saturation, and Lightness Explained (HSL, Simply)
Hue is the color, saturation is how vivid, lightness is how bright. A simple, visual guide to the HSL model used everywhere from CSS to design tools.
The Types of Color Blindness, Explained
Color blindness isn't one thing. Here are the main types — protan, deutan, tritan, and complete — how common each is, and what they actually look like.
How a Colorblind Test Works (and How to Take One)
Those dotted circles with hidden numbers have a name and a history. Here's how the Ishihara colorblind test works — and what it can and can't tell you.
How Spot the Color Generates Its Off-Shade Tiles
Every round, one tile is a slightly different shade. Here's the exact HSL lightness math that controls how hard it is — and why your eyes struggle as the grid grows.