#3C558A · #82403D
Four independent scores (read the one that fits your goal): Readability 1/100 (fail) · Harmony 93/100 (split-complementary) · Distinguishable 92/100 (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.
Dusty Blue and Chestnut are very different (ΔE 52). They have distinctly different hues (142° apart) and their lightness is similar, so they read as two same-weight colours.
Dusty Blue text on Chestnut: 1.04:1 (Fail); Chestnut text on Dusty Blue: 1.04:1 (Fail). Neither meets AA at body size — nudging one color to #ACC8FF clears it.
Split-complementary — split-complementary — 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 #ACC8FF clears AA.
Their CIE76 ΔE is about 52 — very different.
clearly different colours (ΔE 52).
Explore each color: Dusty Blue #3C558A · Chestnut #82403D · Shades: Dusty Blue shades · Chestnut shades · Contrast checker →