#0187AF · #4C7BC0
Four independent scores (read the one that fits your goal): Readability 1/100 (fail) · Harmony 99/100 (analogous) · Distinguishable 35/100 (hard to tell apart) · Match 47/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Cerulean and Steel Blue are a clear pair (ΔE 24). They have closely related hues (22° apart) and their lightness is similar, so they read as two same-weight colours.
Cerulean text on Steel Blue: 1.04:1 (Fail); Steel Blue text on Cerulean: 1.04:1 (Fail). Neither meets AA at body size — nudging one color to #00101A clears it.
Analogous — analogous — a recognised, balanced pairing (harmony 99/100). This is about how they look together (clothing, interiors, branding), independent of text contrast.
Not at body size — the best direction is only 1.0:1, below the 4.5:1 minimum. Nudging one colour to #00101A clears AA.
Their CIE76 ΔE is about 24 — a clear pair.
clearly different colours (ΔE 24).
Explore each color: Cerulean #0187AF · Steel Blue #4C7BC0 · Shades: Cerulean shades · Steel Blue shades · Contrast checker →