#3FCBB6 · #74C889
Four independent scores (read the one that fits your goal): Readability 0/100 (fail) · Harmony 96/100 (analogous) · Distinguishable 58/100 (somewhat similar) · Match 47/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Medium Aquamarine and Emerald are a clear pair (ΔE 24). They have distinctly different hues (36° apart) and their lightness is similar, so they read as two same-weight colours.
Medium Aquamarine text on Emerald: 1.01:1 (Fail); Emerald text on Medium Aquamarine: 1.01:1 (Fail). Neither meets AA at body size — nudging one color to #005248 clears it.
Analogous — analogous — a recognised, balanced pairing (harmony 96/100). 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 #005248 clears AA.
Their CIE76 ΔE is about 24 — a clear pair.
clearly different colours (ΔE 24).
Explore each color: Medium Aquamarine #3FCBB6 · Emerald #74C889 · Shades: Medium Aquamarine shades · Emerald shades · Contrast checker →