#2A79E4 · #7A64DF
Four independent scores (read the one that fits your goal): Readability 1/100 (fail) · Harmony 96/100 (analogous) · Distinguishable 56/100 (somewhat similar) · Match 47/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Royal Blue and Medium Slate Blue are a clear pair (ΔE 24). They have distinctly different hues (36° apart) and their lightness is similar, so they read as two same-weight colours.
Royal Blue text on Medium Slate Blue: 1.05:1 (Fail); Medium Slate Blue text on Royal Blue: 1.05:1 (Fail). Neither meets AA at body size — nudging one color to #000033 clears it.
Analogous — analogous — a recognised, balanced pairing (harmony 96/100). 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 #000033 clears AA.
Their CIE76 ΔE is about 24 — a clear pair.
clearly different colours (ΔE 24).
Explore each color: Royal Blue #2A79E4 · Medium Slate Blue #7A64DF · Shades: Royal Blue shades · Medium Slate Blue shades · Contrast checker →