HueComb

Cute Crab

#dd4444

A red that is saturated. It is light — black text sits on it comfortably, white text does not.

Hex

#dd4444

RGB

221, 68, 68

OKLCh

60.7% 0.190 24.8°

CIELAB (D50)

52.5, 60.0, 36.0

What is true of this colour, and of no other

  • One other named colour sits within ΔE00 2 of it.
  • It uses 77% of the chroma sRGB can show at this lightness and hue.
  • As text on white it measures APCA Lc 67.9; on black, Lc -33.8. The sign is the polarity, which the WCAG ratio discards.
  • Built into an eleven-step scale, 10 of the 10 adjacent pairs stay ΔE00 2 apart — see the ramp.
  • protanopia and deuteranopia and tritanopia shift it by ΔE00 36.5 and 42.5 and 49.9 — no red cone.

Text on this colour

White text

4.21:1 — large text only

Black text

4.98:1 — passes AA

Black text is the better of the two at4.98:1. That is enough for body text.

As text on white, it needs to change

#d73e3f is the nearest colour of the same hue that passes AA on white, at 4.50:1. Only the lightness moved.

Try it against your own background

The same colour, with one cone missing

As you see it

#dd4444

protanopia

#666646 · ΔE00 36.5

deuteranopia

#8a8a3a · ΔE00 42.5

tritanopia

#a7a700 · ΔE00 49.9

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isVermilion Cinnabar at ΔE00 1.071: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.

7 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.