#3F74CF#3F74CF

#3F74CF is a mid, vivid blue. Relative luminance 0.181; OKLCH L 56.9% C 0.152 H 260.5°. Best body text is #000000 at 4.61:1 contrast (WCAG AA passes).

Color values

HEX	#3F74CF
RGB	rgb(63, 116, 207)
HSL	hsl(218, 60%, 53%)
HSV	hsv(218, 70%, 81%)
CMYK	cmyk(69.6%, 44%, 0%, 18.8%)
CIE-LAB	lab(49.56, 12.59, -52.27)
CIE-LCH	lch(49.56, 53.76, 283.54°)
OKLab	oklab(56.91% -0.0251 -0.1495)
OKLCH	oklch(56.91% 0.152 260.5)
XYZ	xyz(19.5537, 18.0505, 61.4730)
Luminance	0.1805 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F74CF #CF9A3F

analogous

#3FBCCF #3F74CF #523FCF

triadic

#3F74CF #CF3F74 #74CF3F

tetradic

#3F74CF #CF3FBC #CF9A3F #3FCF52

square

#3F74CF #CF3FBC #CF9A3F #3FCF52

split-complementary

#3F74CF #CF523F #BCCF3F

monochromatic

#1E3E76 #2A58A7 #3F74CF #7097DB #A1BBE7

Accessibility & contrast

On white

4.55

#3F74CF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.61

#3F74CF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F74CF

4.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F74CF	#FFFFFF	#000000	##000000
##3F74CF	1.00	4.55	4.61	4.61
#FFFFFF	4.55	1.00	21.00	21.00
#000000	4.61	21.00	1.00	1.00
##000000	4.61	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#477DD2

Deuteranopia (green-blind)

#2D70CD

Tritanopia (blue-blind)

#008997

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #3f74cf;
/* rgb */ color: rgb(63, 116, 207);
/* oklch */ color: oklch(56.9% 0.152 260.5);

Tailwind

colors: {
  custom: {
    50: '#849bde',
    500: '#3f74cf',
    950: '#000000',
  },
}

SCSS

$custom: #3f74cf;
$custom-light: #849bde;
$custom-dark: #000000;

JSON

{
  "hex": "#3f74cf",
  "rgb": {
    "r": 63,
    "g": 116,
    "b": 207
  },
  "hsl": {
    "h": 217.917,
    "s": 60,
    "l": 52.941
  },
  "oklch": {
    "l": 0.5691,
    "c": 0.15159,
    "h": 260.5
  },
  "luminance": 0.18053
}

Semantic roles & 50–950 ramp

primary

#3F74CF

secondary

#D4BD96

accent

#A945E3

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F74CF

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

Preview Lab → · Contrast checker → · Palette generator →