Daily games for your eyes.

About Huekle — train your color vision

Huekle is a free set of daily color games that sharpen how finely your eyes read hue, lightness and saturation. Color discrimination is a trainable perceptual skill, not fixed talent — like an ear for music, your eye measurably improves with short, regular practice, and most players start telling smaller differences apart within a few weeks.

Every day brings one puzzle per game, the same for everyone, with no account, no install and nothing ever leaving your device. Sharper-eye games like Huefork estimate your just-noticeable difference (JND) — the smallest shade step you can reliably tell apart, reported as a Delta-E number. A lower score means a keener eye and steadier color judgement.

A trained eye pays off far beyond the puzzles. It helps designers and developers choose accessible, on-brand palettes, guides photographers and retouchers through white balance and skin tones, and keeps print, paint and textile work matching across screens and materials. Once you can see small differences, you stop trusting the swatch label and start trusting your eyes.

Want the theory behind the play? Our Learn about color guides explain hue, saturation and lightness, color harmony and how your eyes see color — each paired with a game so you can feel it, not just read it. The daily games and every guide stay free forever; a Personal Pass simply adds progress tracking, and our tools for teachers and self-learners turn any game into a one-link assignment.