#3721B4#3721B4

#3721B4 is a dark, highly saturated blue. Relative luminance 0.052; OKLCH L 39.7% C 0.212 H 277.3°. Best body text is #FFFFFF at 10.30:1 contrast (WCAG AA passes).

Color values

HEX	#3721B4
RGB	rgb(55, 33, 180)
HSL	hsl(249, 69%, 42%)
HSV	hsv(249, 82%, 71%)
CMYK	cmyk(69.4%, 81.7%, 0%, 29.4%)
CIE-LAB	lab(27.28, 52.25, -72.82)
CIE-LCH	lch(27.28, 89.63, 305.66°)
OKLab	oklab(39.65% 0.0271 -0.2104)
OKLCH	oklch(39.65% 0.212 277.3)
XYZ	xyz(10.3550, 5.1943, 43.6281)
Luminance	0.0520 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3721B4 #9EB421

analogous

#2154B4 #3721B4 #8121B4

triadic

#3721B4 #B43721 #21B437

tetradic

#3721B4 #B42154 #9EB421 #21B481

square

#3721B4 #B42154 #9EB421 #21B481

split-complementary

#3721B4 #B48121 #54B421

monochromatic

#170E4D #271880 #3721B4 #5038DA #7D6BE4

Accessibility & contrast

On white

10.30

#3721B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#3721B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3721B4

10.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3721B4	#FFFFFF	#000000	##FFFFFF
##3721B4	1.00	10.30	2.04	10.30
#FFFFFF	10.30	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0046B8

Deuteranopia (green-blind)

#003AB1

Tritanopia (blue-blind)

#004F6C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #3721b4;
/* rgb */ color: rgb(55, 33, 180);
/* oklch */ color: oklch(39.7% 0.212 277.3);

Tailwind

colors: {
  custom: {
    50: '#8162cc',
    500: '#3721b4',
    950: '#000000',
  },
}

SCSS

$custom: #3721b4;
$custom-light: #8162cc;
$custom-dark: #000000;

JSON

{
  "hex": "#3721b4",
  "rgb": {
    "r": 55,
    "g": 33,
    "b": 180
  },
  "hsl": {
    "h": 248.98,
    "s": 69.014,
    "l": 41.765
  },
  "oklch": {
    "l": 0.39652,
    "c": 0.21215,
    "h": 277.3
  },
  "luminance": 0.05195
}

Semantic roles & 50–950 ramp

primary

#3721B4

secondary

#BBCA67

accent

#EC3CD2

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0514

muted

#7D7A82

Preview Lab

Preview with #3721B4

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

Preview Lab → · Contrast checker → · Palette generator →