HueComb

Tomato

#ef4026

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

Hex

#ef4026

RGB

239, 64, 38

OKLCh

63.0% 0.215 31.5°

CIELAB (D50)

55.1, 66.2, 55.7

What is true of this colour, and of no other

  • 6 other named colours sit within ΔE00 2 of it.
  • It uses 89% of the chroma sRGB can show at this lightness and hue — close enough to the boundary that a wider display would show it slightly more vividly.
  • As text on white it measures APCA Lc 64.6; on black, Lc -37.0. 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 40.8 and 44.5 and 48.3 — no red cone.

Text on this colour

White text

3.87:1 — large text only

Black text

5.43:1 — passes AA

Black text is the better of the two at5.43:1. That is enough for body text.

As text on white, it needs to change

#e23116 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

#ef4026

protanopia

#696929 · ΔE00 40.8

deuteranopia

#929204 · ΔE00 44.5

tritanopia

#b3b300 · ΔE00 48.3

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isHeavy Orange at ΔE00 0.36: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.

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