#54CD91 · #97C35D
Four independent scores (read the one that fits your goal): Readability 0/100 (fail) · Harmony 30/100 (clashing) · Distinguishable 76/100 (easy to tell apart) · Match 32/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Emerald and Yellow Green are very different (ΔE 31). They have distinctly different hues (64° apart) and their lightness is similar, so they read as two same-weight colours.
Emerald text on Yellow Green: 1.02:1 (Fail); Yellow Green text on Emerald: 1.02:1 (Fail). Neither meets AA at body size — nudging one color to #005332 clears it.
Clashing — awkward hue gap — tends to clash (harmony 30/100). 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 #005332 clears AA.
Their CIE76 ΔE is about 31 — very different.
clearly different colours (ΔE 31).
Explore each color: Emerald #54CD91 · Yellow Green #97C35D · Shades: Emerald shades · Yellow Green shades · Contrast checker →