#4273BB#4273BB

#4273BB is a mid, vivid blue. Relative luminance 0.170; OKLCH L 55.6% C 0.125 H 258.0°. Best body text is #FFFFFF at 4.77:1 contrast (WCAG AA passes).

Color values

HEX	#4273BB
RGB	rgb(66, 115, 187)
HSL	hsl(216, 48%, 50%)
HSV	hsv(216, 65%, 73%)
CMYK	cmyk(64.7%, 38.5%, 0%, 26.7%)
CIE-LAB	lab(48.27, 6.58, -42.85)
CIE-LCH	lch(48.27, 43.35, 278.74°)
OKLab	oklab(55.58% -0.0259 -0.1218)
OKLCH	oklch(55.58% 0.125 258)
XYZ	xyz(17.3439, 17.0059, 49.3725)
Luminance	0.1701 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4273BB #BB8A42

analogous

#42B0BB #4273BB #4D42BB

triadic

#4273BB #BB4273 #73BB42

tetradic

#4273BB #BB42B0 #BB8A42 #42BB4D

square

#4273BB #BB42B0 #BB8A42 #42BB4D

split-complementary

#4273BB #BB4D42 #B0BB42

monochromatic

#223B61 #32578E #4273BB #6E94CC #9CB6DC

Accessibility & contrast

On white

4.77

#4273BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.40

#4273BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4273BB

4.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4273BB	#FFFFFF	#000000	##FFFFFF
##4273BB	1.00	4.77	4.40	4.77
#FFFFFF	4.77	1.00	21.00	1.00
#000000	4.40	21.00	1.00	21.00
##FFFFFF	4.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5379BE

Deuteranopia (green-blind)

#426DBA

Tritanopia (blue-blind)

#00838E

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #4273bb;
/* rgb */ color: rgb(66, 115, 187);
/* oklch */ color: oklch(55.6% 0.125 258.0);

Tailwind

colors: {
  custom: {
    50: '#829ad0',
    500: '#4273bb',
    950: '#000000',
  },
}

SCSS

$custom: #4273bb;
$custom-light: #829ad0;
$custom-dark: #000000;

JSON

{
  "hex": "#4273bb",
  "rgb": {
    "r": 66,
    "g": 115,
    "b": 187
  },
  "hsl": {
    "h": 215.702,
    "s": 47.826,
    "l": 49.608
  },
  "oklch": {
    "l": 0.55579,
    "c": 0.12453,
    "h": 258
  },
  "luminance": 0.17008
}

Semantic roles & 50–950 ramp

primary

#4273BB

secondary

#C8B291

accent

#A150D7

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #4273BB

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

Preview Lab → · Contrast checker → · Palette generator →