#3EC0DE · #6DB5F4
Four independent scores (read the one that fits your goal): Readability 0/100 (fail) · Harmony 89/100 (analogous) · Distinguishable 30/100 (hard to tell apart) · Match 47/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Cyan and Vivid Cyan are a clear pair (ΔE 24). They have closely related hues (17° apart) and their lightness is similar, so they read as two same-weight colours.
Cyan text on Vivid Cyan: 1.02:1 (Fail); Vivid Cyan text on Cyan: 1.02:1 (Fail). Neither meets AA at body size — nudging one color to #004A59 clears it.
Analogous — analogous — a recognised, balanced pairing (harmony 89/100). 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 #004A59 clears AA.
Their CIE76 ΔE is about 24 — a clear pair.
clearly different colours (ΔE 24).
Explore each color: Cyan #3EC0DE · Vivid Cyan #6DB5F4 · Shades: Cyan shades · Vivid Cyan shades · Contrast checker →