#3F74C7#3F74C7

#3F74C7 is a mid, vivid blue. Relative luminance 0.177; OKLCH L 56.4% C 0.141 H 259.1°. Best body text is #FFFFFF at 4.63:1 contrast (WCAG AA passes).

Color values

HEX	#3F74C7
RGB	rgb(63, 116, 199)
HSL	hsl(217, 55%, 51%)
HSV	hsv(217, 68%, 78%)
CMYK	cmyk(68.3%, 41.7%, 0%, 22%)
CIE-LAB	lab(49.09, 9.72, -48.44)
CIE-LCH	lch(49.09, 49.41, 281.34°)
OKLab	oklab(56.4% -0.0267 -0.1383)
OKLCH	oklch(56.4% 0.141 259.1)
XYZ	xyz(18.6004, 17.6692, 56.4520)
Luminance	0.1767 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F74C7 #C7923F

analogous

#3FB8C7 #3F74C7 #4E3FC7

triadic

#3F74C7 #C73F74 #74C73F

tetradic

#3F74C7 #C73FB8 #C7923F #3FC74E

square

#3F74C7 #C73FB8 #C7923F #3FC74E

split-complementary

#3F74C7 #C74E3F #B8C73F

monochromatic

#203D6C #2D589B #3F74C7 #6E96D5 #9EB9E3

Accessibility & contrast

On white

4.63

#3F74C7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.53

#3F74C7 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F74C7

4.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F74C7	#FFFFFF	#000000	##FFFFFF
##3F74C7	1.00	4.63	4.53	4.63
#FFFFFF	4.63	1.00	21.00	1.00
#000000	4.53	21.00	1.00	21.00
##FFFFFF	4.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4D7BCA

Deuteranopia (green-blind)

#376FC5

Tritanopia (blue-blind)

#008794

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f74c7;
/* rgb */ color: rgb(63, 116, 199);
/* oklch */ color: oklch(56.4% 0.141 259.1);

Tailwind

colors: {
  custom: {
    50: '#839bd8',
    500: '#3f74c7',
    950: '#000000',
  },
}

SCSS

$custom: #3f74c7;
$custom-light: #839bd8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f74c7",
  "rgb": {
    "r": 63,
    "g": 116,
    "b": 199
  },
  "hsl": {
    "h": 216.618,
    "s": 54.839,
    "l": 51.373
  },
  "oklch": {
    "l": 0.564,
    "c": 0.1408,
    "h": 259.1
  },
  "luminance": 0.17671
}

Semantic roles & 50–950 ramp

primary

#3F74C7

secondary

#CFB893

accent

#A44ADE

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0C0E14

muted

#7D7E83

Preview Lab

Preview with #3F74C7

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

Preview Lab → · Contrast checker → · Palette generator →