#00A4EF · #01ADC1
Four independent scores (read the one that fits your goal): Readability 1/100 (fail) · Harmony 78/100 (monochrome) · Distinguishable 36/100 (hard to tell apart) · Match 26/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Vivid Cyan and Light Sea Green are very different (ΔE 34). They have closely related hues (13° apart) and their lightness is similar, so they read as two same-weight colours.
Vivid Cyan text on Light Sea Green: 1.03:1 (Fail); Light Sea Green text on Vivid Cyan: 1.03:1 (Fail). Neither meets AA at body size — nudging one color to #003857 clears it.
Monochrome — monochrome — 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 #003857 clears AA.
Their CIE76 ΔE is about 34 — very different.
clearly different colours (ΔE 34).
Explore each color: Vivid Cyan #00A4EF · Light Sea Green #01ADC1 · Shades: Vivid Cyan shades · Light Sea Green shades · Contrast checker →