#AFD6C2 · #C6C8EC
Four independent scores (read the one that fits your goal): Readability 1/100 (fail) · Harmony 40/100 (clashing) · Distinguishable 26/100 (hard to tell apart) · Match 27/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Light Blue and Periwinkle are very different (ΔE 33). They have distinctly different hues (88° apart) and their lightness is similar, so they read as two same-weight colours.
Light Blue text on Periwinkle: 1.03:1 (Fail); Periwinkle text on Light Blue: 1.03:1 (Fail). Neither meets AA at body size — nudging one color to #3A5D4D clears it.
Clashing — awkward hue gap — tends to clash (harmony 40/100). 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 #3A5D4D clears AA.
Their CIE76 ΔE is about 33 — very different.
clearly different colours (ΔE 33).
Explore each color: Light Blue #AFD6C2 · Periwinkle #C6C8EC · Shades: Light Blue shades · Periwinkle shades · Contrast checker →