#577EB8 · #5E8B4F
Four independent scores (read the one that fits your goal): Readability 1/100 (fail) · Harmony 93/100 (triadic) · Distinguishable 69/100 (somewhat similar) · Match 0/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Steel Blue and Sea Green are very different (ΔE 69). They have distinctly different hues (111° apart) and their lightness is similar, so they read as two same-weight colours.
Steel Blue text on Sea Green: 1.04:1 (Fail); Sea Green text on Steel Blue: 1.04:1 (Fail). Neither meets AA at body size — nudging one color to #001340 clears it.
Triadic — triadic — a recognised, balanced pairing (harmony 93/100). 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 #001340 clears AA.
Their CIE76 ΔE is about 69 — very different.
clearly different colours (ΔE 69).
Explore each color: Steel Blue #577EB8 · Sea Green #5E8B4F · Shades: Steel Blue shades · Sea Green shades · Contrast checker →