#F72E21 · #FFFFFF
Four independent scores (read the one that fits your goal): Readability 52/100 (aa large) · Harmony 100/100 (monochrome) · Distinguishable 100/100 (easy to tell apart) · Match 0/100 (different). There is no single “good/bad” — a pair can clash for text yet be great for an outfit.
Scarlet and White are very different (ΔE 103). They have closely related hues (4° apart) and their lightness is different, giving a clear light/dark split.
Scarlet text on White: 3.91:1 (AA Large); White text on Scarlet: 3.91:1 (AA Large). Neither meets AA at body size — nudging one color to #EA1A10 clears it.
Monochrome — monochrome — a recognised, balanced pairing (harmony 100/100). This is about how they look together (clothing, interiors, branding), independent of text contrast.
Not at body size — the best direction is only 3.9:1, below the 4.5:1 minimum. Nudging one colour to #EA1A10 clears AA.
Their CIE76 ΔE is about 103 — very different.
clearly different colours (ΔE 103).
Explore each color: Scarlet #F72E21 · White #FFFFFF · Shades: Scarlet shades · White shades · Contrast checker →