#FF0100#FF0100

#FF0100 is a light, highly saturated red. Relative luminance 0.213; OKLCH L 62.8% C 0.258 H 29.3°. Best body text is #000000 at 5.26:1 contrast (WCAG AA passes).

Color values

HEX	#FF0100
RGB	rgb(255, 1, 0)
HSL	hsl(0, 100%, 50%)
HSV	hsv(0, 100%, 100%)
CMYK	cmyk(0%, 99.6%, 100%, 0%)
CIE-LAB	lab(53.26, 80.02, 67.21)
CIE-LCH	lch(53.26, 104.50, 40.03°)
OKLab	oklab(62.81% 0.2247 0.1259)
OKLCH	oklch(62.81% 0.258 29.3)
XYZ	xyz(41.2565, 21.2890, 1.9370)
Luminance	0.2128 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#FF0100 #00FEFF

analogous

#FF007F #FF0100 #FF8000

triadic

#FF0100 #00FF01 #0100FF

tetradic

#FF0100 #7FFF00 #00FEFF #8000FF

square

#FF0100 #7FFF00 #00FEFF #8000FF

split-complementary

#FF0100 #00FF80 #007FFF

monochromatic

#850100 #C20100 #FF0100 #FF3E3D #FF7B7A

Accessibility & contrast

On white

4.00

#FF0100 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.26

#FF0100 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #FF0100

5.26:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##FF0100	#FFFFFF	#000000	##000000
##FF0100	1.00	4.00	5.26	5.26
#FFFFFF	4.00	1.00	21.00	21.00
#000000	5.26	21.00	1.00	1.00
##000000	5.26	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6D5F00

Deuteranopia (green-blind)

#A39000

Tritanopia (blue-blind)

#FF000F

Achromatopsia (no color)

#7F7F7F

Design tokens & code

CSS

--color: #ff0100;
/* rgb */ color: rgb(255, 1, 0);
/* oklch */ color: oklch(62.8% 0.258 29.3);

Tailwind

colors: {
  custom: {
    50: '#ff7352',
    500: '#ff0100',
    950: '#000000',
  },
}

SCSS

$custom: #ff0100;
$custom-light: #ff7352;
$custom-dark: #000000;

JSON

{
  "hex": "#ff0100",
  "rgb": {
    "r": 255,
    "g": 1,
    "b": 0
  },
  "hsl": {
    "h": 0.235,
    "s": 100,
    "l": 50
  },
  "oklch": {
    "l": 0.62813,
    "c": 0.25751,
    "h": 29.3
  },
  "luminance": 0.21282
}

Semantic roles & 50–950 ramp

primary

#FF0100

secondary

#74E6E7

accent

#FEFF29

background

#FFF7F5

surface

#FFEEE9

border

#D7C9C5

text

#1C0A03

muted

#887C78

Preview Lab

Preview with #FF0100

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →