#FF0000 · #FFFFFF
Four independent scores (read the one that fits your goal): Readability 53/100 (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.
Red and White are very different (ΔE 115). They have closely related hues (0° apart) and their lightness is different, giving a clear light/dark split.
Red text on White: 4.00:1 (AA Large); White text on Red: 4.00:1 (AA Large). Neither meets AA at body size — nudging one color to #EE0000 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 4.0:1, below the 4.5:1 minimum. Nudging one colour to #EE0000 clears AA.
Their CIE76 ΔE is about 115 — very different.
clearly different colours (ΔE 115).
Explore each color: Red #FF0000 · White #FFFFFF · Shades: Red shades · White shades · Contrast checker →