#3F75D7#3F75D7

#3F75D7 is a mid, vivid blue. Relative luminance 0.187; OKLCH L 57.6% C 0.161 H 261.2°. Best body text is #000000 at 4.74:1 contrast (WCAG AA passes).

Color values

HEX	#3F75D7
RGB	rgb(63, 117, 215)
HSL	hsl(219, 66%, 55%)
HSV	hsv(219, 71%, 84%)
CMYK	cmyk(70.7%, 45.6%, 0%, 15.7%)
CIE-LAB	lab(50.31, 14.85, -55.60)
CIE-LCH	lch(50.31, 57.55, 284.96°)
OKLab	oklab(57.65% -0.0247 -0.1593)
OKLCH	oklch(57.65% 0.161 261.2)
XYZ	xyz(20.6725, 18.6835, 66.7936)
Luminance	0.1869 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F75D7 #D7A13F

analogous

#3FC1D7 #3F75D7 #553FD7

triadic

#3F75D7 #D73F75 #75D73F

tetradic

#3F75D7 #D73FC1 #D7A13F #3FD755

square

#3F75D7 #D73FC1 #D7A13F #3FD755

split-complementary

#3F75D7 #D7553F #C1D73F

monochromatic

#1B3F81 #2558B3 #3F75D7 #7299E2 #A4BEEC

Accessibility & contrast

On white

4.43

#3F75D7 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.74

#3F75D7 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F75D7

4.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F75D7	#FFFFFF	#000000	##000000
##3F75D7	1.00	4.43	4.74	4.74
#FFFFFF	4.43	1.00	21.00	21.00
#000000	4.74	21.00	1.00	1.00
##000000	4.74	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#437FDB

Deuteranopia (green-blind)

#2371D5

Tritanopia (blue-blind)

#008C9B

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #3f75d7;
/* rgb */ color: rgb(63, 117, 215);
/* oklch */ color: oklch(57.6% 0.161 261.2);

Tailwind

colors: {
  custom: {
    50: '#869ce4',
    500: '#3f75d7',
    950: '#000000',
  },
}

SCSS

$custom: #3f75d7;
$custom-light: #869ce4;
$custom-dark: #000000;

JSON

{
  "hex": "#3f75d7",
  "rgb": {
    "r": 63,
    "g": 117,
    "b": 215
  },
  "hsl": {
    "h": 218.684,
    "s": 65.517,
    "l": 54.51
  },
  "oklch": {
    "l": 0.57648,
    "c": 0.16117,
    "h": 261.2
  },
  "luminance": 0.18686
}

Semantic roles & 50–950 ramp

primary

#3F75D7

secondary

#D9C299

accent

#AC3FE8

background

#F8F9FE

surface

#F0F2FC

border

#CBCCD5

text

#0C0E16

muted

#7D7E84

Preview Lab

Preview with #3F75D7

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

Preview Lab → · Contrast checker → · Palette generator →