#4191C3 · #6E85CA
Four independent scores (read the one that fits your goal): Readability 1/100 (fail) · Harmony 93/100 (analogous) · Distinguishable 41/100 (somewhat similar) · Match 57/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Steel Blue and Blue are a clear pair (ΔE 19). They have closely related hues (22° apart) and their lightness is similar, so they read as two same-weight colours.
Steel Blue text on Blue: 1.03:1 (Fail); Blue text on Steel Blue: 1.03:1 (Fail). Neither meets AA at body size — nudging one color to #002339 clears it.
Analogous — analogous — a recognised, balanced pairing (harmony 93/100). 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 #002339 clears AA.
Their CIE76 ΔE is about 19 — a clear pair.
clearly different colours (ΔE 19).
Explore each color: Steel Blue #4191C3 · Blue #6E85CA · Shades: Steel Blue shades · Blue shades · Contrast checker →