#0438DE · #6700CF
Four independent scores (read the one that fits your goal): Readability 1/100 (fail) · Harmony 69/100 (analogous (soft)) · Distinguishable 59/100 (somewhat similar) · Match 55/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Vivid Blue and Vivid Indigo are a clear pair (ΔE 21). They have distinctly different hues (44° apart) and their lightness is similar, so they read as two same-weight colours.
Vivid Blue text on Vivid Indigo: 1.06:1 (Fail); Vivid Indigo text on Vivid Blue: 1.06:1 (Fail). Neither meets AA at body size — nudging one color to #9DBDFF clears it.
Analogous (soft) — workable but not a textbook harmony (harmony 69/100). 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 #9DBDFF clears AA.
Their CIE76 ΔE is about 21 — a clear pair.
clearly different colours (ΔE 21).
Explore each color: Vivid Blue #0438DE · Vivid Indigo #6700CF · Shades: Vivid Blue shades · Vivid Indigo shades · Contrast checker →