#C0E5C8 · #CDD9FF
Four independent scores (read the one that fits your goal): Readability 0/100 (fail) · Harmony 52/100 (triadic (soft)) · Distinguishable 38/100 (hard to tell apart) · Match 19/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Pale Turquoise and Periwinkle are very different (ΔE 37). They have distinctly different hues (93° apart) and their lightness is similar, so they read as two same-weight colours.
Pale Turquoise text on Periwinkle: 1.02:1 (Fail); Periwinkle text on Pale Turquoise: 1.02:1 (Fail). Neither meets AA at body size — nudging one color to #47674F clears it.
Triadic (soft) — workable but not a textbook harmony (harmony 52/100). 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 #47674F clears AA.
Their CIE76 ΔE is about 37 — very different.
clearly different colours (ΔE 37).
Explore each color: Pale Turquoise #C0E5C8 · Periwinkle #CDD9FF · Shades: Pale Turquoise shades · Periwinkle shades · Contrast checker →