Match the target color
How to use the trainer
Each round shows a random target color on the left. Rebuild it on the right with three sliders: hue (where the color sits on the color wheel), saturation (how intense it is) and brightness (how light or dark it is). Press submit and you get a score out of 100, the exact target values, and the channel you missed most. Five rounds a day is enough to notice real progress within a week.
If this format feels familiar, it is the same idea behind Toon Tone, a cartoon color guessing game, where you match the colors of famous cartoon characters from memory. The how to play Toon Tone page explains its scoring, which also weights hue errors less when a color is very pale or very dark.
Why HSB sliders beat RGB for training
RGB values describe how a screen mixes light, not how people see color. Changing the red channel can shift both the hue and the brightness at once, which makes it hard to learn from your mistakes. HSB separates the three things your eye actually judges. If you want the background, read the HSB color model explained; it is a five-minute read with diagrams.
A practical order works best: lock in the hue first, because it is the biggest visual difference; then adjust saturation until the color feels equally "loud"; finish with brightness. Most beginners overshoot saturation and undershoot brightness, so watch for that in your "biggest miss" feedback.
Getting better faster
Short, frequent sessions help more than long ones. Play a few rounds, rest your eyes, and come back later. Avoid night-mode filters and very low screen brightness while practicing, since both shift colors. For a structured routine, see this guide to train your color eye, and if you enjoy the challenge, here is a list of the best daily color puzzle games to rotate through. You can also find more free color games that test different skills, like shade ordering and palette memory.