#3F77CF#3F77CF

#3F77CF is a mid, vivid blue. Relative luminance 0.188; OKLCH L 57.6% C 0.148 H 259.1°. Best body text is #000000 at 4.75:1 contrast (WCAG AA passes).

Color values

HEX	#3F77CF
RGB	rgb(63, 119, 207)
HSL	hsl(217, 60%, 53%)
HSV	hsv(217, 70%, 81%)
CMYK	cmyk(69.6%, 42.5%, 0%, 18.8%)
CIE-LAB	lab(50.40, 10.73, -50.93)
CIE-LCH	lch(50.40, 52.04, 281.90°)
OKLab	oklab(57.56% -0.0279 -0.1455)
OKLCH	oklch(57.56% 0.148 259.1)
XYZ	xyz(19.9051, 18.7533, 61.5901)
Luminance	0.1875 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F77CF #CF973F

analogous

#3FBFCF #3F77CF #4F3FCF

triadic

#3F77CF #CF3F77 #77CF3F

tetradic

#3F77CF #CF3FBF #CF973F #3FCF4F

square

#3F77CF #CF3FBF #CF973F #3FCF4F

split-complementary

#3F77CF #CF4F3F #BFCF3F

monochromatic

#1E4076 #2A5AA7 #3F77CF #709ADB #A1BCE7

Accessibility & contrast

On white

4.42

#3F77CF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.75

#3F77CF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F77CF

4.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F77CF	#FFFFFF	#000000	##000000
##3F77CF	1.00	4.42	4.75	4.75
#FFFFFF	4.42	1.00	21.00	21.00
#000000	4.75	21.00	1.00	1.00
##000000	4.75	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4D7FD2

Deuteranopia (green-blind)

#3472CD

Tritanopia (blue-blind)

#008B99

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #3f77cf;
/* rgb */ color: rgb(63, 119, 207);
/* oklch */ color: oklch(57.6% 0.148 259.1);

Tailwind

colors: {
  custom: {
    50: '#849dde',
    500: '#3f77cf',
    950: '#000000',
  },
}

SCSS

$custom: #3f77cf;
$custom-light: #849dde;
$custom-dark: #000000;

JSON

{
  "hex": "#3f77cf",
  "rgb": {
    "r": 63,
    "g": 119,
    "b": 207
  },
  "hsl": {
    "h": 216.667,
    "s": 60,
    "l": 52.941
  },
  "oklch": {
    "l": 0.57559,
    "c": 0.14815,
    "h": 259.1
  },
  "luminance": 0.18755
}

Semantic roles & 50–950 ramp

primary

#3F77CF

secondary

#D4BC96

accent

#A645E3

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F77CF

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

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