Bellhollow
Pick one colour and watch a full interface palette derive from it, with every foreground-on-background pairing measured against real WCAG contrast thresholds as you drag.
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Every good question starts from what you noticed.
Bellhollow
Entering a different seed hex re-derives the entire system — ramp, pairing matrix and specimen — live, without a page reload.
BellhollowType one hex and the whole system re-derives: a perceptual ramp, 144 pairings with real contrast ratios, and a specimen interface wearing them.