#00434A · #103F57
Four independent scores (read the one that fits your goal): Readability 0/100 (fail) · Harmony 78/100 (analogous) · Distinguishable 11/100 (hard to tell apart) · Match 71/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Deep Vivid Cyan and Dark Cyan are a clear pair (ΔE 13). They have closely related hues (15° apart) and their lightness is similar, so they read as two same-weight colours.
Deep Vivid Cyan text on Dark Cyan: 1.02:1 (Fail); Dark Cyan text on Deep Vivid Cyan: 1.02:1 (Fail). Neither meets AA at body size — nudging one color to #75AEB5 clears it.
Analogous — analogous — a recognised, balanced pairing (harmony 78/100). 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 #75AEB5 clears AA.
Their CIE76 ΔE is about 13 — a clear pair.
clearly different colours (ΔE 13).
Explore each color: Deep Vivid Cyan #00434A · Dark Cyan #103F57 · Shades: Deep Vivid Cyan shades · Dark Cyan shades · Contrast checker →