#BCD5FF · #BCDFB7
Four independent scores (read the one that fits your goal): Readability 0/100 (fail) · Harmony 82/100 (triadic) · Distinguishable 52/100 (somewhat similar) · Match 4/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Periwinkle and Seafoam are very different (ΔE 44). They have distinctly different hues (105° apart) and their lightness is similar, so they read as two same-weight colours.
Periwinkle text on Seafoam: 1.02:1 (Fail); Seafoam text on Periwinkle: 1.02:1 (Fail). Neither meets AA at body size — nudging one color to #485D82 clears it.
Triadic — triadic — a recognised, balanced pairing (harmony 82/100). 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 #485D82 clears AA.
Their CIE76 ΔE is about 44 — very different.
clearly different colours (ΔE 44).
Explore each color: Periwinkle #BCD5FF · Seafoam #BCDFB7 · Shades: Periwinkle shades · Seafoam shades · Contrast checker →