What's My ΔE_OK JND?

Hard Mode

Nine squares. One is a different colour. Click it. The gap between squares means no gradient to help you - just raw colour perception.

Each round the colours get closer together until we find your Just Noticeable Difference. Most people do worse here than the easy mode. That's normal. The gaps remove the free hints.

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Your ΔE_OK JND

Hard Mode

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