#3F74DF#3F74DF

#3F74DF is a mid, vivid blue. Relative luminance 0.189; OKLCH L 58.0% C 0.173 H 262.5°. Best body text is #000000 at 4.78:1 contrast (WCAG AA passes).

Color values

HEX	#3F74DF
RGB	rgb(63, 116, 223)
HSL	hsl(220, 71%, 56%)
HSV	hsv(220, 72%, 87%)
CMYK	cmyk(71.7%, 48%, 0%, 12.5%)
CIE-LAB	lab(50.54, 18.37, -59.76)
CIE-LCH	lch(50.54, 62.52, 287.08°)
OKLab	oklab(57.98% -0.0226 -0.1715)
OKLCH	oklch(57.98% 0.173 262.5)
XYZ	xyz(21.6098, 18.8729, 72.3017)
Luminance	0.1888 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F74DF #DFAA3F

analogous

#3FC4DF #3F74DF #5A3FDF

triadic

#3F74DF #DF3F74 #74DF3F

tetradic

#3F74DF #DF3FC4 #DFAA3F #3FDF5A

square

#3F74DF #DF3FC4 #DFAA3F #3FDF5A

split-complementary

#3F74DF #DF5A3F #C4DF3F

monochromatic

#173E8C #2055C1 #3F74DF #739AE8 #A8C0F0

Accessibility & contrast

On white

4.40

#3F74DF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.78

#3F74DF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F74DF

4.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F74DF	#FFFFFF	#000000	##000000
##3F74DF	1.00	4.40	4.78	4.78
#FFFFFF	4.40	1.00	21.00	21.00
#000000	4.78	21.00	1.00	1.00
##000000	4.78	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3880E3

Deuteranopia (green-blind)

#0171DD

Tritanopia (blue-blind)

#008D9F

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #3f74df;
/* rgb */ color: rgb(63, 116, 223);
/* oklch */ color: oklch(58.0% 0.173 262.5);

Tailwind

colors: {
  custom: {
    50: '#879bea',
    500: '#3f74df',
    950: '#000000',
  },
}

SCSS

$custom: #3f74df;
$custom-light: #879bea;
$custom-dark: #000000;

JSON

{
  "hex": "#3f74df",
  "rgb": {
    "r": 63,
    "g": 116,
    "b": 223
  },
  "hsl": {
    "h": 220.125,
    "s": 71.429,
    "l": 56.078
  },
  "oklch": {
    "l": 0.57979,
    "c": 0.17302,
    "h": 262.5
  },
  "luminance": 0.18875
}

Semantic roles & 50–950 ramp

primary

#3F74DF

secondary

#DEC89C

accent

#B23AEE

background

#F9F9FE

surface

#F1F2FD

border

#CBCCD5

text

#0D0E16

muted

#7E7E84

Preview Lab

Preview with #3F74DF

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

Preview Lab → · Contrast checker → · Palette generator →