#3F74E8#3F74E8

#3F74E8 is a mid, vivid blue. Relative luminance 0.194; OKLCH L 58.6% C 0.185 H 263.3°. Best body text is #000000 at 4.87:1 contrast (WCAG AA passes).

Color values

HEX	#3F74E8
RGB	rgb(63, 116, 232)
HSL	hsl(221, 79%, 58%)
HSV	hsv(221, 73%, 91%)
CMYK	cmyk(72.8%, 50%, 0%, 9%)
CIE-LAB	lab(51.12, 21.62, -63.89)
CIE-LCH	lch(51.12, 67.45, 288.70°)
OKLab	oklab(58.61% -0.0214 -0.1837)
OKLCH	oklch(58.61% 0.185 263.3)
XYZ	xyz(22.8556, 19.3712, 78.8628)
Luminance	0.1937 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F74E8 #E8B33F

analogous

#3FC9E8 #3F74E8 #5E3FE8

triadic

#3F74E8 #E83F74 #74E83F

tetradic

#3F74E8 #E83FC9 #E8B33F #3FE85E

square

#3F74E8 #E83FC9 #E8B33F #3FE85E

split-complementary

#3F74E8 #E85E3F #C9E83F

monochromatic

#123D9A #1953D1 #3F74E8 #769CEF #ACC3F5

Accessibility & contrast

On white

4.31

#3F74E8 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.87

#3F74E8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F74E8

4.87:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F74E8	#FFFFFF	#000000	##000000
##3F74E8	1.00	4.31	4.87	4.87
#FFFFFF	4.31	1.00	21.00	21.00
#000000	4.87	21.00	1.00	1.00
##000000	4.87	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#2D82EC

Deuteranopia (green-blind)

#0072E6

Tritanopia (blue-blind)

#0090A3

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #3f74e8;
/* rgb */ color: rgb(63, 116, 232);
/* oklch */ color: oklch(58.6% 0.185 263.3);

Tailwind

colors: {
  custom: {
    50: '#899bf0',
    500: '#3f74e8',
    950: '#000000',
  },
}

SCSS

$custom: #3f74e8;
$custom-light: #899bf0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f74e8",
  "rgb": {
    "r": 63,
    "g": 116,
    "b": 232
  },
  "hsl": {
    "h": 221.183,
    "s": 78.605,
    "l": 57.843
  },
  "oklch": {
    "l": 0.58608,
    "c": 0.18493,
    "h": 263.3
  },
  "luminance": 0.19374
}

Semantic roles & 50–950 ramp

primary

#3F74E8

secondary

#E3CEA0

accent

#B833F5

background

#F9F9FE

surface

#F1F2FD

border

#CBCCD5

text

#0D0E17

muted

#7E7E85

Preview Lab

Preview with #3F74E8

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

Preview Lab → · Contrast checker → · Palette generator →