#0087B0 · #FFFFFF
Four independent scores (read the one that fits your goal): Readability 55/100 (aa large) · Harmony 84/100 (complementary) · Distinguishable 95/100 (easy to tell apart) · Match 0/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Cerulean and White are very different (ΔE 59). They have near-opposite hues (166° apart) and their lightness is different, giving a clear light/dark split.
Cerulean text on White: 4.12:1 (AA Large); White text on Cerulean: 4.12:1 (AA Large). Neither meets AA at body size — nudging one color to #0080A8 clears it.
Complementary — complementary — a recognised, balanced pairing (harmony 84/100). This is about how they look together (clothing, interiors, branding), independent of text contrast.
Not at body size — the best direction is only 4.1:1, below the 4.5:1 minimum. Nudging one colour to #0080A8 clears AA.
Their CIE76 ΔE is about 59 — very different.
clearly different colours (ΔE 59).
Explore each color: Cerulean #0087B0 · White #FFFFFF · Shades: Cerulean shades · White shades · Contrast checker →