#0080D1 · #6366F1
Four independent scores (read the one that fits your goal): Readability 1/100 (fail) · Harmony 100/100 (analogous) · Distinguishable 43/100 (somewhat similar) · Match 5/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Vivid Cyan and Medium Slate Blue are very different (ΔE 43). They have distinctly different hues (35° apart) and their lightness is different, giving a clear light/dark split.
Vivid Cyan text on Medium Slate Blue: 1.07:1 (Fail); Medium Slate Blue text on Vivid Cyan: 1.07:1 (Fail). Neither meets AA at body size — nudging one color to #00061C clears it.
Analogous — analogous — 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 #00061C clears AA.
Their CIE76 ΔE is about 43 — very different.
clearly different colours (ΔE 43).
Explore each color: Vivid Cyan #0080D1 · Medium Slate Blue #6366F1 · Shades: Vivid Cyan shades · Medium Slate Blue shades · Contrast checker →