#5BBC8D · #989DED
Four independent scores (read the one that fits your goal): Readability 2/100 (fail) · Harmony 42/100 (clashing) · Distinguishable 51/100 (somewhat similar) · Match 0/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Medium Sea Green and Light Blue are very different (ΔE 80). They have distinctly different hues (86° apart) and their lightness is different, giving a clear light/dark split.
Medium Sea Green text on Light Blue: 1.08:1 (Fail); Light Blue text on Medium Sea Green: 1.08:1 (Fail). Neither meets AA at body size — nudging one color to #00442A clears it.
Clashing — awkward hue gap — tends to clash (harmony 42/100). This is about how they look together (clothing, interiors, branding), independent of text contrast.
Not at body size — the best direction is only 1.1:1, below the 4.5:1 minimum. Nudging one colour to #00442A clears AA.
Their CIE76 ΔE is about 80 — very different.
clearly different colours (ΔE 80).
Explore each color: Medium Sea Green #5BBC8D · Light Blue #989DED · Shades: Medium Sea Green shades · Light Blue shades · Contrast checker →