#4B51CB#4B51CB

#4B51CB is a mid, vivid blue. Relative luminance 0.117; OKLCH L 50.3% C 0.186 H 275.3°. Best body text is #FFFFFF at 6.29:1 contrast (WCAG AA passes).

Color values

HEX	#4B51CB
RGB	rgb(75, 81, 203)
HSL	hsl(237, 55%, 55%)
HSV	hsv(237, 63%, 80%)
CMYK	cmyk(63.1%, 60.1%, 0%, 20.4%)
CIE-LAB	lab(40.72, 35.11, -64.21)
CIE-LCH	lch(40.72, 73.18, 298.67°)
OKLab	oklab(50.31% 0.0173 -0.1848)
OKLCH	oklch(50.31% 0.186 275.3)
XYZ	xyz(16.6200, 11.6911, 57.8691)
Luminance	0.1169 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4B51CB #CBC54B

analogous

#4B91CB #4B51CB #854BCB

triadic

#4B51CB #CB4B51 #51CB4B

tetradic

#4B51CB #CB4B91 #CBC54B #4BCB85

square

#4B51CB #CB4B91 #CBC54B #4BCB85

split-complementary

#4B51CB #CB854B #91CB4B

monochromatic

#232779 #3136A8 #4B51CB #7A7FD9 #AAADE6

Accessibility & contrast

On white

6.29

#4B51CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.34

#4B51CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4B51CB

6.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4B51CB	#FFFFFF	#000000	##FFFFFF
##4B51CB	1.00	6.29	3.34	6.29
#FFFFFF	6.29	1.00	21.00	1.00
#000000	3.34	21.00	1.00	21.00
##FFFFFF	6.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0066CF

Deuteranopia (green-blind)

#005AC9

Tritanopia (blue-blind)

#006F86

Achromatopsia (no color)

#606060

Design tokens & code

CSS

--color: #4b51cb;
/* rgb */ color: rgb(75, 81, 203);
/* oklch */ color: oklch(50.3% 0.186 275.3);

Tailwind

colors: {
  custom: {
    50: '#8b82dc',
    500: '#4b51cb',
    950: '#000000',
  },
}

SCSS

$custom: #4b51cb;
$custom-light: #8b82dc;
$custom-dark: #000000;

JSON

{
  "hex": "#4b51cb",
  "rgb": {
    "r": 75,
    "g": 81,
    "b": 203
  },
  "hsl": {
    "h": 237.188,
    "s": 55.172,
    "l": 54.51
  },
  "oklch": {
    "l": 0.50309,
    "c": 0.18563,
    "h": 275.3
  },
  "luminance": 0.11693
}

Semantic roles & 50–950 ramp

primary

#4B51CB

secondary

#D4D19E

accent

#D849DF

background

#F9F7FD

surface

#F1EEFB

border

#CBC9D4

text

#0D0A15

muted

#7E7C83

Preview Lab

Preview with #4B51CB

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

Preview Lab → · Contrast checker → · Palette generator →