#4273D9#4273D9

#4273D9 is a mid, vivid blue. Relative luminance 0.184; OKLCH L 57.5% C 0.165 H 263.0°. Best body text is #000000 at 4.69:1 contrast (WCAG AA passes).

Color values

HEX	#4273D9
RGB	rgb(66, 115, 217)
HSL	hsl(221, 67%, 55%)
HSV	hsv(221, 70%, 85%)
CMYK	cmyk(69.6%, 47%, 0%, 14.9%)
CIE-LAB	lab(50.01, 17.25, -57.22)
CIE-LCH	lch(50.01, 59.76, 286.78°)
OKLab	oklab(57.49% -0.0203 -0.164)
OKLCH	oklch(57.49% 0.165 263)
XYZ	xyz(20.8974, 18.4273, 68.0877)
Luminance	0.1843 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4273D9 #D9A842

analogous

#42BED9 #4273D9 #5C42D9

triadic

#4273D9 #D94273 #73D942

tetradic

#4273D9 #D942BE #D9A842 #42D95C

square

#4273D9 #D942BE #D9A842 #42D95C

split-complementary

#4273D9 #D95C42 #BED942

monochromatic

#1B3E86 #2555B9 #4273D9 #7599E3 #A8BEED

Accessibility & contrast

On white

4.48

#4273D9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.69

#4273D9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4273D9

4.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4273D9	#FFFFFF	#000000	##000000
##4273D9	1.00	4.48	4.69	4.69
#FFFFFF	4.48	1.00	21.00	21.00
#000000	4.69	21.00	1.00	1.00
##000000	4.69	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3D7EDD

Deuteranopia (green-blind)

#1870D7

Tritanopia (blue-blind)

#008B9B

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #4273d9;
/* rgb */ color: rgb(66, 115, 217);
/* oklch */ color: oklch(57.5% 0.165 263.0);

Tailwind

colors: {
  custom: {
    50: '#879ae5',
    500: '#4273d9',
    950: '#000000',
  },
}

SCSS

$custom: #4273d9;
$custom-light: #879ae5;
$custom-dark: #000000;

JSON

{
  "hex": "#4273d9",
  "rgb": {
    "r": 66,
    "g": 115,
    "b": 217
  },
  "hsl": {
    "h": 220.53,
    "s": 66.52,
    "l": 55.49
  },
  "oklch": {
    "l": 0.57487,
    "c": 0.16526,
    "h": 263
  },
  "luminance": 0.18429
}

Semantic roles & 50–950 ramp

primary

#4273D9

secondary

#DBC69C

accent

#B23EE9

background

#F9F9FE

surface

#F1F2FC

border

#CBCCD5

text

#0D0E16

muted

#7E7E84

Preview Lab

Preview with #4273D9

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

Preview Lab → · Contrast checker → · Palette generator →