#3737B9#3737B9

#3737B9 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 43.1% C 0.198 H 274.3°. Best body text is #FFFFFF at 8.72:1 contrast (WCAG AA passes).

Color values

HEX	#3737B9
RGB	rgb(55, 55, 185)
HSL	hsl(240, 54%, 47%)
HSV	hsv(240, 70%, 73%)
CMYK	cmyk(70.3%, 70.3%, 0%, 27.5%)
CIE-LAB	lab(31.91, 42.18, -68.15)
CIE-LCH	lch(31.91, 80.15, 301.75°)
OKLab	oklab(43.07% 0.0148 -0.197)
OKLCH	oklch(43.07% 0.198 274.3)
XYZ	xyz(11.6958, 7.0463, 46.6332)
Luminance	0.0705 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3737B9 #B9B937

analogous

#3778B9 #3737B9 #7837B9

triadic

#3737B9 #B93737 #37B937

tetradic

#3737B9 #B93778 #B9B937 #37B978

square

#3737B9 #B93778 #B9B937 #37B978

split-complementary

#3737B9 #B97837 #78B937

monochromatic

#1B1B5B #29298A #3737B9 #5E5ECF #8D8DDD

Accessibility & contrast

On white

8.72

#3737B9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.41

#3737B9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3737B9

8.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3737B9	#FFFFFF	#000000	##FFFFFF
##3737B9	1.00	8.72	2.41	8.72
#FFFFFF	8.72	1.00	21.00	1.00
#000000	2.41	21.00	1.00	21.00
##FFFFFF	8.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051BD

Deuteranopia (green-blind)

#0045B7

Tritanopia (blue-blind)

#005B74

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #3737b9;
/* rgb */ color: rgb(55, 55, 185);
/* oklch */ color: oklch(43.1% 0.198 274.3);

Tailwind

colors: {
  custom: {
    50: '#806fcf',
    500: '#3737b9',
    950: '#000000',
  },
}

SCSS

$custom: #3737b9;
$custom-light: #806fcf;
$custom-dark: #000000;

JSON

{
  "hex": "#3737b9",
  "rgb": {
    "r": 55,
    "g": 55,
    "b": 185
  },
  "hsl": {
    "h": 240,
    "s": 54.167,
    "l": 47.059
  },
  "oklch": {
    "l": 0.43073,
    "c": 0.19755,
    "h": 274.3
  },
  "luminance": 0.07047
}

Semantic roles & 50–950 ramp

primary

#3737B9

secondary

#C8C884

accent

#DE4ADE

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0714

muted

#7D7A82

Preview Lab

Preview with #3737B9

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

Preview Lab → · Contrast checker → · Palette generator →