HueComb

Flamboyant

#f73d37

A red that is about as vivid as sRGB can show at this lightness. It is light — black text sits on it comfortably, white text does not.

Hex

#f73d37

RGB

247, 61, 55

OKLCh

64.3% 0.223 27.5°

CIELAB (D50)

56.4, 69.8, 49.0

What is true of this colour, and of no other

  • 3 other named colours sit within ΔE00 2 of it.
  • It uses 92% 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 63.0; on black, Lc -38.7. 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 41.2 and 46.4 and 51.6 — no red cone.

Text on this colour

White text

3.70:1 — large text only

Black text

5.68:1 — passes AA

Black text is the better of the two at5.68:1. That is enough for body text.

As text on white, it needs to change

#e52727 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

#f73d37

protanopia

#6b6b3a · ΔE00 41.2

deuteranopia

#969625 · ΔE00 46.4

tritanopia

#b9b900 · ΔE00 51.6

Run a whole palette through all three

The twelve nearest named colours

Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isPelati at ΔE00 1.27: between 1 and 2 — a trained eye spots it when the two touch; nobody spots it across a room. What the numbers mean.

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