#3721B2#3721B2

#3721B2 is a dark, highly saturated blue. Relative luminance 0.051; OKLCH L 39.4% C 0.210 H 277.6°. Best body text is #FFFFFF at 10.38:1 contrast (WCAG AA passes).

Color values

HEX	#3721B2
RGB	rgb(55, 33, 178)
HSL	hsl(249, 69%, 41%)
HSV	hsv(249, 81%, 70%)
CMYK	cmyk(69.1%, 81.5%, 0%, 30.2%)
CIE-LAB	lab(27.06, 51.65, -72.00)
CIE-LCH	lch(27.06, 88.61, 305.66°)
OKLab	oklab(39.43% 0.0277 -0.208)
OKLCH	oklch(39.43% 0.21 277.6)
XYZ	xyz(10.1527, 5.1134, 42.5628)
Luminance	0.0511 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3721B2 #9CB221

analogous

#2154B2 #3721B2 #8021B2

triadic

#3721B2 #B23721 #21B237

tetradic

#3721B2 #B22154 #9CB221 #21B280

square

#3721B2 #B22154 #9CB221 #21B280

split-complementary

#3721B2 #B28021 #54B221

monochromatic

#170E4B #27177E #3721B2 #4F36DA #7C6AE3

Accessibility & contrast

On white

10.38

#3721B2 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#3721B2 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3721B2

10.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3721B2	#FFFFFF	#000000	##FFFFFF
##3721B2	1.00	10.38	2.02	10.38
#FFFFFF	10.38	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0046B6

Deuteranopia (green-blind)

#003AB0

Tritanopia (blue-blind)

#004E6B

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #3721b2;
/* rgb */ color: rgb(55, 33, 178);
/* oklch */ color: oklch(39.4% 0.210 277.6);

Tailwind

colors: {
  custom: {
    50: '#8161ca',
    500: '#3721b2',
    950: '#000000',
  },
}

SCSS

$custom: #3721b2;
$custom-light: #8161ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3721b2",
  "rgb": {
    "r": 55,
    "g": 33,
    "b": 178
  },
  "hsl": {
    "h": 249.103,
    "s": 68.72,
    "l": 41.373
  },
  "oklch": {
    "l": 0.3943,
    "c": 0.20987,
    "h": 277.6
  },
  "luminance": 0.05114
}

Semantic roles & 50–950 ramp

primary

#3721B2

secondary

#BAC966

accent

#EC3CD1

background

#F8F6FC

surface

#F0EBF9

border

#CBC6D2

text

#0C0513

muted

#7D7A82

Preview Lab

Preview with #3721B2

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

Preview Lab → · Contrast checker → · Palette generator →