#3F74C8#3F74C8

#3F74C8 is a mid, vivid blue. Relative luminance 0.177; OKLCH L 56.5% C 0.142 H 259.3°. Best body text is #FFFFFF at 4.62:1 contrast (WCAG AA passes).

Color values

HEX	#3F74C8
RGB	rgb(63, 116, 200)
HSL	hsl(217, 55%, 52%)
HSV	hsv(217, 69%, 78%)
CMYK	cmyk(68.5%, 42%, 0%, 21.6%)
CIE-LAB	lab(49.15, 10.08, -48.92)
CIE-LCH	lch(49.15, 49.95, 281.64°)
OKLab	oklab(56.46% -0.0265 -0.1397)
OKLCH	oklch(56.46% 0.142 259.3)
XYZ	xyz(18.7169, 17.7158, 57.0655)
Luminance	0.1772 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F74C8 #C8933F

analogous

#3FB9C8 #3F74C8 #4F3FC8

triadic

#3F74C8 #C83F74 #74C83F

tetradic

#3F74C8 #C83FB9 #C8933F #3FC84F

square

#3F74C8 #C83FB9 #C8933F #3FC84F

split-complementary

#3F74C8 #C84F3F #B9C83F

monochromatic

#1F3D6D #2D589D #3F74C8 #6F96D6 #9EB9E3

Accessibility & contrast

On white

4.62

#3F74C8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.54

#3F74C8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F74C8

4.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F74C8	#FFFFFF	#000000	##FFFFFF
##3F74C8	1.00	4.62	4.54	4.62
#FFFFFF	4.62	1.00	21.00	1.00
#000000	4.54	21.00	1.00	21.00
##FFFFFF	4.62	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C7CCB

Deuteranopia (green-blind)

#366FC6

Tritanopia (blue-blind)

#008794

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f74c8;
/* rgb */ color: rgb(63, 116, 200);
/* oklch */ color: oklch(56.5% 0.142 259.3);

Tailwind

colors: {
  custom: {
    50: '#839bd9',
    500: '#3f74c8',
    950: '#000000',
  },
}

SCSS

$custom: #3f74c8;
$custom-light: #839bd9;
$custom-dark: #000000;

JSON

{
  "hex": "#3f74c8",
  "rgb": {
    "r": 63,
    "g": 116,
    "b": 200
  },
  "hsl": {
    "h": 216.788,
    "s": 55.466,
    "l": 51.569
  },
  "oklch": {
    "l": 0.56463,
    "c": 0.14215,
    "h": 259.3
  },
  "luminance": 0.17718
}

Semantic roles & 50–950 ramp

primary

#3F74C8

secondary

#D0B893

accent

#A549DF

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F74C8

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

Preview Lab → · Contrast checker → · Palette generator →