About ColorGuesser

What is ColorGuesser?

ColorGuesser is a free daily color-guessing game. Each day, five color names are revealed one at a time — your job is to pick the matching color using a color wheel, as accurately as you can. Scores are calculated using CIE94, a perceptual color difference model that measures how different two colors look to the human eye.

Why does it exist?

It started as a weekend experiment to explore how well people can name colors from memory. Colors have names like "Mango Tango", "Smashed Pumpkin", and "Palatinate Blue" — some obvious, many surprising. The game makes you think more carefully about the relationship between color names and the actual hues they describe.

Somewhere along the way, people kept playing it — so it kept getting better.

Game Modes

• Daily — one puzzle per day, the same for everyone worldwide.
• Opposite — guess the complementary color instead of the named one.
• Infinite — endless practice rounds, no daily limit.

Color Tools

Beyond the game, ColorGuesser includes a suite of free color tools for designers and developers: a contrast checker, palette generator, color converter, blindness simulator, color mixer, and shades & tints generator. All tools run in the browser — no signup required.

Who made this?

ColorGuesser is made and maintained by Kiru, an independent developer who builds small online projects. The color names come from the open-source color-names database by meodai.

Get in touch

Found a bug, have a suggestion, or just want to say hi? Use the contact form — feedback is always welcome.