#051847 · #210F43
Four independent scores (read the one that fits your goal): Readability 0/100 (fail) · Harmony 94/100 (analogous) · Distinguishable 40/100 (somewhat similar) · Match 78/100 (close). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Deep Vivid Blue and Deep Indigo are very close (ΔE 10). They have distinctly different hues (38° apart) and their lightness is similar, so they read as two same-weight colours.
Deep Vivid Blue text on Deep Indigo: 1.01:1 (Fail); Deep Indigo text on Deep Vivid Blue: 1.01:1 (Fail). Neither meets AA at body size — nudging one color to #6682BA clears it.
Analogous — analogous — a recognised, balanced pairing (harmony 94/100). 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 #6682BA clears AA.
Their CIE76 ΔE is about 10 — very close.
close but visibly different (ΔE 10.0).
Explore each color: Deep Vivid Blue #051847 · Deep Indigo #210F43 · Shades: Deep Vivid Blue shades · Deep Indigo shades · Contrast checker →