#6366F1 · #D73F00
Four independent scores (read the one that fits your goal): Readability 0/100 (fail) · Harmony 82/100 (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.
Medium Slate Blue and Burnt Orange are very different (ΔE 133). They have distinctly different hues (139° apart) and their lightness is different, giving a clear light/dark split.
Medium Slate Blue text on Burnt Orange: 1.02:1 (Fail); Burnt Orange text on Medium Slate Blue: 1.02:1 (Fail). Neither meets AA at body size — nudging one color to #FDFEFF clears it.
Split-complementary — split-complementary — a recognised, balanced pairing (harmony 82/100). 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 #FDFEFF clears AA.
Their CIE76 ΔE is about 133 — very different.
clearly different colours (ΔE 133).
Explore each color: Medium Slate Blue #6366F1 · Burnt Orange #D73F00 · Shades: Medium Slate Blue shades · Burnt Orange shades · Contrast checker →