#051847 · #291A00
Four independent scores (read the one that fits your goal): Readability 0/100 (fail) · Harmony 97/100 (complementary) · Distinguishable 78/100 (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.
Deep Vivid Blue and Deep Vivid Yellow are very different (ΔE 48). They have near-opposite hues (175° apart) and their lightness is similar, so they read as two same-weight colours.
Deep Vivid Blue text on Deep Vivid Yellow: 1.01:1 (Fail); Deep Vivid Yellow text on Deep Vivid Blue: 1.01:1 (Fail). Neither meets AA at body size — nudging one color to #6784BC clears it.
Complementary — complementary — a recognised, balanced pairing (harmony 97/100). 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 #6784BC clears AA.
Their CIE76 ΔE is about 48 — very different.
clearly different colours (ΔE 48).
Explore each color: Deep Vivid Blue #051847 · Deep Vivid Yellow #291A00 · Shades: Deep Vivid Blue shades · Deep Vivid Yellow shades · Contrast checker →