#4257BB#4257BB

#4257BB is a mid, vivid blue. Relative luminance 0.116; OKLCH L 49.6% C 0.159 H 270.6°. Best body text is #FFFFFF at 6.34:1 contrast (WCAG AA passes).

Color values

HEX	#4257BB
RGB	rgb(66, 87, 187)
HSL	hsl(230, 48%, 50%)
HSV	hsv(230, 65%, 73%)
CMYK	cmyk(64.7%, 53.5%, 0%, 26.7%)
CIE-LAB	lab(40.51, 24.33, -55.27)
CIE-LCH	lch(40.51, 60.39, 293.76°)
OKLab	oklab(49.64% 0.0018 -0.1587)
OKLCH	oklch(49.64% 0.159 270.6)
XYZ	xyz(14.6216, 11.5612, 48.4651)
Luminance	0.1156 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4257BB #BBA642

analogous

#4293BB #4257BB #6A42BB

triadic

#4257BB #BB4257 #57BB42

tetradic

#4257BB #BB4293 #BBA642 #42BB6A

square

#4257BB #BB4293 #BBA642 #42BB6A

split-complementary

#4257BB #BB6A42 #93BB42

monochromatic

#222D61 #32428E #4257BB #6E7FCC #9CA7DC

Accessibility & contrast

On white

6.34

#4257BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.31

#4257BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4257BB

6.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4257BB	#FFFFFF	#000000	##FFFFFF
##4257BB	1.00	6.34	3.31	6.34
#FFFFFF	6.34	1.00	21.00	1.00
#000000	3.31	21.00	1.00	21.00
##FFFFFF	6.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1465BF

Deuteranopia (green-blind)

#005AB9

Tritanopia (blue-blind)

#006F80

Achromatopsia (no color)

#5F5F5F

Design tokens & code

CSS

--color: #4257bb;
/* rgb */ color: rgb(66, 87, 187);
/* oklch */ color: oklch(49.6% 0.159 270.6);

Tailwind

colors: {
  custom: {
    50: '#8386d0',
    500: '#4257bb',
    950: '#000000',
  },
}

SCSS

$custom: #4257bb;
$custom-light: #8386d0;
$custom-dark: #000000;

JSON

{
  "hex": "#4257bb",
  "rgb": {
    "r": 66,
    "g": 87,
    "b": 187
  },
  "hsl": {
    "h": 229.587,
    "s": 47.826,
    "l": 49.608
  },
  "oklch": {
    "l": 0.49636,
    "c": 0.15872,
    "h": 270.6
  },
  "luminance": 0.11562
}

Semantic roles & 50–950 ramp

primary

#4257BB

secondary

#C8BE91

accent

#C050D7

background

#F8F8FC

surface

#F0EFF9

border

#CBCAD2

text

#0C0B14

muted

#7D7C82

Preview Lab

Preview with #4257BB

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

Preview Lab → · Contrast checker → · Palette generator →