#3957CB#3957CB

#3957CB is a mid, vivid blue. Relative luminance 0.120; OKLCH L 50.4% C 0.183 H 268.1°. Best body text is #FFFFFF at 6.18:1 contrast (WCAG AA passes).

Color values

HEX	#3957CB
RGB	rgb(57, 87, 203)
HSL	hsl(228, 58%, 51%)
HSV	hsv(228, 72%, 80%)
CMYK	cmyk(71.9%, 57.1%, 0%, 20.4%)
CIE-LAB	lab(41.21, 28.74, -63.46)
CIE-LCH	lch(41.21, 69.66, 294.36°)
OKLab	oklab(50.4% -0.0061 -0.183)
OKLCH	oklch(50.4% 0.183 268.1)
XYZ	xyz(15.8713, 11.9964, 57.9674)
Luminance	0.1200 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3957CB #CBAD39

analogous

#39A0CB #3957CB #6439CB

triadic

#3957CB #CB3957 #57CB39

tetradic

#3957CB #CB39A0 #CBAD39 #39CB64

square

#3957CB #CB39A0 #CBAD39 #39CB64

split-complementary

#3957CB #CB6439 #A0CB39

monochromatic

#1D2D6D #29419D #3957CB #6980D8 #9AA9E4

Accessibility & contrast

On white

6.18

#3957CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.40

#3957CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3957CB

6.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3957CB	#FFFFFF	#000000	##FFFFFF
##3957CB	1.00	6.18	3.40	6.18
#FFFFFF	6.18	1.00	21.00	1.00
#000000	3.40	21.00	1.00	21.00
##FFFFFF	6.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0068CF

Deuteranopia (green-blind)

#005BC9

Tritanopia (blue-blind)

#007488

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #3957cb;
/* rgb */ color: rgb(57, 87, 203);
/* oklch */ color: oklch(50.4% 0.183 268.1);

Tailwind

colors: {
  custom: {
    50: '#8286dc',
    500: '#3957cb',
    950: '#000000',
  },
}

SCSS

$custom: #3957cb;
$custom-light: #8286dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3957cb",
  "rgb": {
    "r": 57,
    "g": 87,
    "b": 203
  },
  "hsl": {
    "h": 227.671,
    "s": 58.4,
    "l": 50.98
  },
  "oklch": {
    "l": 0.50404,
    "c": 0.18307,
    "h": 268.1
  },
  "luminance": 0.11998
}

Semantic roles & 50–950 ramp

primary

#3957CB

secondary

#D0C390

accent

#C246E2

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3957CB

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

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