#3F77CC#3F77CC

#3F77CC is a mid, vivid blue. Relative luminance 0.186; OKLCH L 57.4% C 0.144 H 258.6°. Best body text is #000000 at 4.72:1 contrast (WCAG AA passes).

Color values

HEX	#3F77CC
RGB	rgb(63, 119, 204)
HSL	hsl(216, 58%, 52%)
HSV	hsv(216, 69%, 80%)
CMYK	cmyk(69.1%, 41.7%, 0%, 20%)
CIE-LAB	lab(50.23, 9.65, -49.49)
CIE-LCH	lch(50.23, 50.42, 281.04°)
OKLab	oklab(57.37% -0.0285 -0.1413)
OKLCH	oklch(57.37% 0.144 258.6)
XYZ	xyz(19.5419, 18.6080, 59.6769)
Luminance	0.1861 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F77CC #CC943F

analogous

#3FBECC #3F77CC #4D3FCC

triadic

#3F77CC #CC3F77 #77CC3F

tetradic

#3F77CC #CC3FBE #CC943F #3FCC4D

square

#3F77CC #CC3FBE #CC943F #3FCC4D

split-complementary

#3F77CC #CC4D3F #BECC3F

monochromatic

#1E4072 #2B5BA3 #3F77CC #6F99D9 #A0BCE6

Accessibility & contrast

On white

4.45

#3F77CC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.72

#3F77CC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F77CC

4.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F77CC	#FFFFFF	#000000	##000000
##3F77CC	1.00	4.45	4.72	4.72
#FFFFFF	4.45	1.00	21.00	21.00
#000000	4.72	21.00	1.00	1.00
##000000	4.72	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F7FCF

Deuteranopia (green-blind)

#3871CA

Tritanopia (blue-blind)

#008B97

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #3f77cc;
/* rgb */ color: rgb(63, 119, 204);
/* oklch */ color: oklch(57.4% 0.144 258.6);

Tailwind

colors: {
  custom: {
    50: '#849ddc',
    500: '#3f77cc',
    950: '#000000',
  },
}

SCSS

$custom: #3f77cc;
$custom-light: #849ddc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f77cc",
  "rgb": {
    "r": 63,
    "g": 119,
    "b": 204
  },
  "hsl": {
    "h": 216.17,
    "s": 58.025,
    "l": 52.353
  },
  "oklch": {
    "l": 0.5737,
    "c": 0.14413,
    "h": 258.6
  },
  "luminance": 0.1861
}

Semantic roles & 50–950 ramp

primary

#3F77CC

secondary

#D2BA95

accent

#A447E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F77CC

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

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