#04212B · #101E2F
Four independent scores (read the one that fits your goal): Readability 0/100 (fail) · Harmony 85/100 (analogous) · Distinguishable 12/100 (hard to tell apart) · Match 83/100 (close). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Deep Cyan and Deep Blue are very close (ΔE 8). They have closely related hues (18° apart) and their lightness is similar, so they read as two same-weight colours.
Deep Cyan text on Deep Blue: 1.01:1 (Fail); Deep Blue text on Deep Cyan: 1.01:1 (Fail). Neither meets AA at body size — nudging one color to #6A8995 clears it.
Analogous — analogous — a recognised, balanced pairing (harmony 85/100). 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 #6A8995 clears AA.
Their CIE76 ΔE is about 8 — very close.
close but visibly different (ΔE 7.6).
Explore each color: Deep Cyan #04212B · Deep Blue #101E2F · Shades: Deep Cyan shades · Deep Blue shades · Contrast checker →