Coluors – Spot the Color

Coluors is a fast, free color-perception game.

A grid of colored squares — one is slightly off. Tap it before time runs out. Every round the difference shrinks, until you're squinting at "is that even different?"

• Timed mode & lives mode
• Reaction-time test
• Interactive colorblind screening grid
• Grayscale & rotating "crazy" variants
• 1v1 and group races — share an invite link, no signup

Plays instantly in the browser, desktop or phone. No install, no account.

How small a color difference can YOU still see?