#0438DE · #6F5100
Four independent scores (read the one that fits your goal): Readability 2/100 (fail) · Harmony 100/100 (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 Dark Vivid Yellow are very different (ΔE 139). They have near-opposite hues (178° apart) and their lightness is different, giving a clear light/dark split.
Vivid Blue text on Dark Vivid Yellow: 1.09:1 (Fail); Dark Vivid Yellow text on Vivid Blue: 1.09:1 (Fail). Neither meets AA at body size — nudging one color to #B1CBFE clears it.
Complementary — complementary — a recognised, balanced pairing (harmony 100/100). 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 #B1CBFE clears AA.
Their CIE76 ΔE is about 139 — very different.
clearly different colours (ΔE 139).
Explore each color: Vivid Blue #0438DE · Dark Vivid Yellow #6F5100 · Shades: Vivid Blue shades · Dark Vivid Yellow shades · Contrast checker →