#587BFF · #E8473A
Four independent scores (read the one that fits your goal): Readability 1/100 (fail) · Harmony 72/100 (split-complementary) · Distinguishable 100/100 (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.
Vivid Blue and Red are very different (ΔE 117). They have distinctly different hues (137° apart) and their lightness is similar, so they read as two same-weight colours.
Vivid Blue text on Red: 1.06:1 (Fail); Red text on Vivid Blue: 1.06:1 (Fail). Neither meets AA at body size — nudging one color to #0A0064 clears it.
Split-complementary — split-complementary — a recognised, balanced pairing (harmony 72/100). This is about how they look together (clothing, interiors, branding), independent of text contrast.
Not at body size — the best direction is only 1.1:1, below the 4.5:1 minimum. Nudging one colour to #0A0064 clears AA.
Their CIE76 ΔE is about 117 — very different.
clearly different colours (ΔE 117).
Explore each color: Vivid Blue #587BFF · Red #E8473A · Shades: Vivid Blue shades · Red shades · Contrast checker →