#3757CF#3757CF

#3757CF is a mid, vivid blue. Relative luminance 0.121; OKLCH L 50.6% C 0.189 H 267.7°. Best body text is #FFFFFF at 6.13:1 contrast (WCAG AA passes).

Color values

HEX	#3757CF
RGB	rgb(55, 87, 207)
HSL	hsl(227, 61%, 51%)
HSV	hsv(227, 73%, 81%)
CMYK	cmyk(73.4%, 58%, 0%, 18.8%)
CIE-LAB	lab(41.42, 29.94, -65.42)
CIE-LCH	lch(41.42, 71.95, 294.59°)
OKLab	oklab(50.64% -0.0077 -0.1888)
OKLCH	oklch(50.64% 0.189 267.7)
XYZ	xyz(16.2423, 12.1319, 60.5051)
Luminance	0.1213 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3757CF #CFAF37

analogous

#37A3CF #3757CF #6337CF

triadic

#3757CF #CF3757 #57CF37

tetradic

#3757CF #CF37A3 #CFAF37 #37CF63

square

#3757CF #CF37A3 #CFAF37 #37CF63

split-complementary

#3757CF #CF6337 #A3CF37

monochromatic

#1B2D71 #2741A2 #3757CF #6880DB #9AAAE7

Accessibility & contrast

On white

6.13

#3757CF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.43

#3757CF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3757CF

6.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3757CF	#FFFFFF	#000000	##FFFFFF
##3757CF	1.00	6.13	3.43	6.13
#FFFFFF	6.13	1.00	21.00	1.00
#000000	3.43	21.00	1.00	21.00
##FFFFFF	6.13	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: #3757cf;
/* rgb */ color: rgb(55, 87, 207);
/* oklch */ color: oklch(50.6% 0.189 267.7);

Tailwind

colors: {
  custom: {
    50: '#8386df',
    500: '#3757cf',
    950: '#000000',
  },
}

SCSS

$custom: #3757cf;
$custom-light: #8386df;
$custom-dark: #000000;

JSON

{
  "hex": "#3757cf",
  "rgb": {
    "r": 55,
    "g": 87,
    "b": 207
  },
  "hsl": {
    "h": 227.368,
    "s": 61.29,
    "l": 51.373
  },
  "oklch": {
    "l": 0.50636,
    "c": 0.18893,
    "h": 267.7
  },
  "luminance": 0.12134
}

Semantic roles & 50–950 ramp

primary

#3757CF

secondary

#D2C48F

accent

#C343E4

background

#F8F8FD

surface

#F0EFFB

border

#CBCAD4

text

#0C0B15

muted

#7D7C83

Preview Lab

Preview with #3757CF

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

Preview Lab → · Contrast checker → · Palette generator →