#EFCDFC · #FFFFFF
Four independent scores (read the one that fits your goal): Readability 8/100 (fail) · Harmony 19/100 (clashing) · Distinguishable 32/100 (hard to tell apart) · Match 33/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Periwinkle and White are very different (ΔE 31). They have distinctly different hues (77° apart) and their lightness is similar, so they read as two same-weight colours.
Periwinkle text on White: 1.42:1 (Fail); White text on Periwinkle: 1.42:1 (Fail). Neither meets AA at body size — nudging one color to #8A6C96 clears it.
Clashing — awkward hue gap — tends to clash (harmony 19/100). This is about how they look together (clothing, interiors, branding), independent of text contrast.
Not at body size — the best direction is only 1.4:1, below the 4.5:1 minimum. Nudging one colour to #8A6C96 clears AA.
Their CIE76 ΔE is about 31 — very different.
clearly different colours (ΔE 31).
Explore each color: Periwinkle #EFCDFC · White #FFFFFF · Shades: Periwinkle shades · White shades · Contrast checker →