#3F74CB#3F74CB

#3F74CB is a mid, vivid blue. Relative luminance 0.179; OKLCH L 56.7% C 0.146 H 259.8°. Best body text is #FFFFFF at 4.59:1 contrast (WCAG AA passes).

Color values

HEX	#3F74CB
RGB	rgb(63, 116, 203)
HSL	hsl(217, 57%, 52%)
HSV	hsv(217, 69%, 80%)
CMYK	cmyk(69%, 42.9%, 0%, 20.4%)
CIE-LAB	lab(49.32, 11.15, -50.36)
CIE-LCH	lch(49.32, 51.58, 282.49°)
OKLab	oklab(56.65% -0.0259 -0.1439)
OKLCH	oklch(56.65% 0.146 259.8)
XYZ	xyz(19.0709, 17.8574, 58.9301)
Luminance	0.1786 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F74CB #CB963F

analogous

#3FBACB #3F74CB #503FCB

triadic

#3F74CB #CB3F74 #74CB3F

tetradic

#3F74CB #CB3FBA #CB963F #3FCB50

square

#3F74CB #CB3FBA #CB963F #3FCB50

split-complementary

#3F74CB #CB503F #BACB3F

monochromatic

#1F3E71 #2C58A1 #3F74CB #6F97D8 #9FBAE5

Accessibility & contrast

On white

4.59

#3F74CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.57

#3F74CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3F74CB

4.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F74CB	#FFFFFF	#000000	##FFFFFF
##3F74CB	1.00	4.59	4.57	4.59
#FFFFFF	4.59	1.00	21.00	1.00
#000000	4.57	21.00	1.00	21.00
##FFFFFF	4.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4A7CCE

Deuteranopia (green-blind)

#326FC9

Tritanopia (blue-blind)

#008895

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f74cb;
/* rgb */ color: rgb(63, 116, 203);
/* oklch */ color: oklch(56.7% 0.146 259.8);

Tailwind

colors: {
  custom: {
    50: '#849bdb',
    500: '#3f74cb',
    950: '#000000',
  },
}

SCSS

$custom: #3f74cb;
$custom-light: #849bdb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f74cb",
  "rgb": {
    "r": 63,
    "g": 116,
    "b": 203
  },
  "hsl": {
    "h": 217.286,
    "s": 57.377,
    "l": 52.157
  },
  "oklch": {
    "l": 0.56653,
    "c": 0.1462,
    "h": 259.8
  },
  "luminance": 0.17859
}

Semantic roles & 50–950 ramp

primary

#3F74CB

secondary

#D1BA94

accent

#A747E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F74CB

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

Preview Lab → · Contrast checker → · Palette generator →