#0A1C3A · #2A1900
Four independent scores (read the one that fits your goal): Readability 0/100 (fail) · Harmony 100/100 (complementary) · Distinguishable 75/100 (easy to tell apart) · Match 18/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Deep Blue and Deep Vivid Yellow are very different (ΔE 37). They have near-opposite hues (178° apart) and their lightness is similar, so they read as two same-weight colours.
Deep Blue text on Deep Vivid Yellow: 1.00:1 (Fail); Deep Vivid Yellow text on Deep Blue: 1.00:1 (Fail). Neither meets AA at body size — nudging one color to #6E85AA 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 1.0:1, below the 4.5:1 minimum. Nudging one colour to #6E85AA clears AA.
Their CIE76 ΔE is about 37 — very different.
clearly different colours (ΔE 37).
Explore each color: Deep Blue #0A1C3A · Deep Vivid Yellow #2A1900 · Shades: Deep Blue shades · Deep Vivid Yellow shades · Contrast checker →