#3957CF#3957CF

#3957CF is a mid, vivid blue. Relative luminance 0.122; OKLCH L 50.7% C 0.188 H 268.2°. Best body text is #FFFFFF at 6.11:1 contrast (WCAG AA passes).

Color values

HEX	#3957CF
RGB	rgb(57, 87, 207)
HSL	hsl(228, 61%, 52%)
HSV	hsv(228, 72%, 81%)
CMYK	cmyk(72.5%, 58%, 0%, 18.8%)
CIE-LAB	lab(41.52, 30.19, -65.27)
CIE-LCH	lch(41.52, 71.91, 294.82°)
OKLab	oklab(50.73% -0.006 -0.1883)
OKLCH	oklch(50.73% 0.188 268.2)
XYZ	xyz(16.3541, 12.1895, 60.5103)
Luminance	0.1219 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3957CF #CFB139

analogous

#39A2CF #3957CF #6639CF

triadic

#3957CF #CF3957 #57CF39

tetradic

#3957CF #CF39A2 #CFB139 #39CF66

square

#3957CF #CF39A2 #CFB139 #39CF66

split-complementary

#3957CF #CF6639 #A2CF39

monochromatic

#1C2D72 #2840A3 #3957CF #6A81DB #9CABE7

Accessibility & contrast

On white

6.11

#3957CF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.44

#3957CF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3957CF

6.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3957CF	#FFFFFF	#000000	##FFFFFF
##3957CF	1.00	6.11	3.44	6.11
#FFFFFF	6.11	1.00	21.00	1.00
#000000	3.44	21.00	1.00	21.00
##FFFFFF	6.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0069D3

Deuteranopia (green-blind)

#005BCD

Tritanopia (blue-blind)

#00758A

Achromatopsia (no color)

#626262

Design tokens & code

CSS

--color: #3957cf;
/* rgb */ color: rgb(57, 87, 207);
/* oklch */ color: oklch(50.7% 0.188 268.2);

Tailwind

colors: {
  custom: {
    50: '#8386df',
    500: '#3957cf',
    950: '#000000',
  },
}

SCSS

$custom: #3957cf;
$custom-light: #8386df;
$custom-dark: #000000;

JSON

{
  "hex": "#3957cf",
  "rgb": {
    "r": 57,
    "g": 87,
    "b": 207
  },
  "hsl": {
    "h": 228,
    "s": 60.976,
    "l": 51.765
  },
  "oklch": {
    "l": 0.50728,
    "c": 0.18838,
    "h": 268.2
  },
  "luminance": 0.12191
}

Semantic roles & 50–950 ramp

primary

#3957CF

secondary

#D3C691

accent

#C444E4

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3957CF

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

Preview Lab → · Contrast checker → · Palette generator →