#3757D9#3757D9

#3757D9 is a mid, highly saturated blue. Relative luminance 0.126; OKLCH L 51.5% C 0.202 H 267.8°. Best body text is #FFFFFF at 5.95:1 contrast (WCAG AA passes).

Color values

HEX	#3757D9
RGB	rgb(55, 87, 217)
HSL	hsl(228, 68%, 53%)
HSV	hsv(228, 75%, 85%)
CMYK	cmyk(74.7%, 59.9%, 0%, 14.9%)
CIE-LAB	lab(42.21, 33.56, -69.88)
CIE-LCH	lch(42.21, 77.52, 295.66°)
OKLab	oklab(51.47% -0.0076 -0.2019)
OKLCH	oklch(51.47% 0.202 267.8)
XYZ	xyz(17.5038, 12.6365, 67.1488)
Luminance	0.1264 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3757D9 #D9B937

analogous

#37A8D9 #3757D9 #6837D9

triadic

#3757D9 #D93757 #57D937

tetradic

#3757D9 #D937A8 #D9B937 #37D968

square

#3757D9 #D937A8 #D9B937 #37D968

split-complementary

#3757D9 #D96837 #A8D937

monochromatic

#182C7E #223EB1 #3757D9 #6A82E3 #9EADED

Accessibility & contrast

On white

5.95

#3757D9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.53

#3757D9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3757D9

5.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3757D9	#FFFFFF	#000000	##FFFFFF
##3757D9	1.00	5.95	3.53	5.95
#FFFFFF	5.95	1.00	21.00	1.00
#000000	3.53	21.00	1.00	21.00
##FFFFFF	5.95	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#006BDD

Deuteranopia (green-blind)

#005CD6

Tritanopia (blue-blind)

#007890

Achromatopsia (no color)

#646464

Design tokens & code

CSS

--color: #3757d9;
/* rgb */ color: rgb(55, 87, 217);
/* oklch */ color: oklch(51.5% 0.202 267.8);

Tailwind

colors: {
  custom: {
    50: '#8586e6',
    500: '#3757d9',
    950: '#000000',
  },
}

SCSS

$custom: #3757d9;
$custom-light: #8586e6;
$custom-dark: #000000;

JSON

{
  "hex": "#3757d9",
  "rgb": {
    "r": 55,
    "g": 87,
    "b": 217
  },
  "hsl": {
    "h": 228.148,
    "s": 68.067,
    "l": 53.333
  },
  "oklch": {
    "l": 0.51466,
    "c": 0.202,
    "h": 267.8
  },
  "luminance": 0.12638
}

Semantic roles & 50–950 ramp

primary

#3757D9

secondary

#D9CB93

accent

#C93DEB

background

#F9F8FE

surface

#F1EFFC

border

#CBCAD5

text

#0D0B16

muted

#7E7C84

Preview Lab

Preview with #3757D9

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

Preview Lab → · Contrast checker → · Palette generator →