#3739FF#3739FF

#3739FF is a mid, highly saturated blue. Relative luminance 0.110; OKLCH L 50.6% C 0.277 H 270.4°. Best body text is #FFFFFF at 6.58:1 contrast (WCAG AA passes).

Color values

HEX	#3739FF
RGB	rgb(55, 57, 255)
HSL	hsl(239, 100%, 61%)
HSV	hsv(239, 78%, 100%)
CMYK	cmyk(78.4%, 77.6%, 0%, 0%)
CIE-LAB	lab(39.51, 63.41, -95.81)
CIE-LCH	lch(39.51, 114.89, 303.50°)
OKLab	oklab(50.58% 0.0019 -0.2774)
OKLCH	oklch(50.58% 0.277 270.4)
XYZ	xyz(21.0825, 10.9561, 95.5920)
Luminance	0.1096 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3739FF #FFFD37

analogous

#379DFF #3739FF #9937FF

triadic

#3739FF #FF3739 #39FF37

tetradic

#3739FF #FF379D #FFFD37 #37FF99

square

#3739FF #FF379D #FFFD37 #37FF99

split-complementary

#3739FF #FF9937 #9DFF37

monochromatic

#0002BC #0002F9 #3739FF #7476FF #B1B2FF

Accessibility & contrast

On white

6.58

#3739FF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.19

#3739FF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3739FF

6.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3739FF	#FFFFFF	#000000	##FFFFFF
##3739FF	1.00	6.58	3.19	6.58
#FFFFFF	6.58	1.00	21.00	1.00
#000000	3.19	21.00	1.00	21.00
##FFFFFF	6.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0067FF

Deuteranopia (green-blind)

#0053FC

Tritanopia (blue-blind)

#00769C

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #3739ff;
/* rgb */ color: rgb(55, 57, 255);
/* oklch */ color: oklch(50.6% 0.277 270.4);

Tailwind

colors: {
  custom: {
    50: '#9073ff',
    500: '#3739ff',
    950: '#000000',
  },
}

SCSS

$custom: #3739ff;
$custom-light: #9073ff;
$custom-dark: #000000;

JSON

{
  "hex": "#3739ff",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 255
  },
  "hsl": {
    "h": 239.4,
    "s": 100,
    "l": 60.784
  },
  "oklch": {
    "l": 0.50583,
    "c": 0.27744,
    "h": 270.4
  },
  "luminance": 0.10958
}

Semantic roles & 50–950 ramp

primary

#3739FF

secondary

#EFEEA3

accent

#E300E6

background

#FAF7FF

surface

#F4EDFF

border

#CEC8D7

text

#0F0818

muted

#7F7B86

Preview Lab

Preview with #3739FF

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

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