What's inside

Four difficulty levels

From Easy, where the wrong colors are clearly different, to Very Hard, where every option sits within a few degrees of hue and a few points of saturation and lightness of the real one.

See the exact values

Turn on color values and every option shows its RGB and HSL numbers underneath - useful for learning how close "close" really is, or just to check your eye against the numbers.

A full game log

A reaction-time chart and a per-game history - rounds, difficulty, accuracy, score - all written to your device and nowhere else.

What you can tune

Two colors or eight

Pick your own crowd

Choose how many shades appear each round. Two is a coin flip to warm up on; eight turns it into a real test of color discrimination.

Longer game, same scale

A score that stays comparable

Your score is normalized against the number of rounds you chose, so a short warm-up and a long session stay comparable side by side.

One tap away

Six languages, no setup

English, German, French, Dutch, Italian and Turkish - the app follows your device's language automatically, or you can choose it yourself.

Nothing is hidden. Display time, wait time, the delay before the next round - every timing knob that shapes the drill is yours to change.

What it doesn't do

✓ No data collectedNo account, no sign-in, no analytics, no trackers. Your settings and scores are written to your device and stay there.

✓ Nothing sent over the networkThe game runs fully offline. Nothing about how you play is uploaded, watched or shared.

✓ No in-app purchases, no adsYou buy the app once. Nothing is locked, nothing nags you, no advertising ever appears.

✓ Safe for children, useful at any ageNo chat, no links to strangers, nothing to stumble into. From 4 to 104 - a few rounds sharpen your color perception at any age.

Full details in the privacy policy. This app also uses one open source dataset - see the open source notices.

A color flashes. Can you still see it?