#3F74CC#3F74CC

#3F74CC is a mid, vivid blue. Relative luminance 0.179; OKLCH L 56.7% C 0.148 H 260.0°. Best body text is #000000 at 4.58:1 contrast (WCAG AA passes).

Color values

HEX	#3F74CC
RGB	rgb(63, 116, 204)
HSL	hsl(217, 58%, 52%)
HSV	hsv(217, 69%, 80%)
CMYK	cmyk(69.1%, 43.1%, 0%, 20%)
CIE-LAB	lab(49.38, 11.51, -50.84)
CIE-LCH	lch(49.38, 52.13, 282.76°)
OKLab	oklab(56.72% -0.0257 -0.1453)
OKLCH	oklch(56.72% 0.148 260)
XYZ	xyz(19.1905, 17.9052, 59.5597)
Luminance	0.1791 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F74CC #CC973F

analogous

#3FBACC #3F74CC #513FCC

triadic

#3F74CC #CC3F74 #74CC3F

tetradic

#3F74CC #CC3FBA #CC973F #3FCC51

square

#3F74CC #CC3FBA #CC973F #3FCC51

split-complementary

#3F74CC #CC513F #BACC3F

monochromatic

#1E3E72 #2B58A3 #3F74CC #6F97D9 #A0BAE6

Accessibility & contrast

On white

4.58

#3F74CC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.58

#3F74CC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F74CC

4.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F74CC	#FFFFFF	#000000	##000000
##3F74CC	1.00	4.58	4.58	4.58
#FFFFFF	4.58	1.00	21.00	21.00
#000000	4.58	21.00	1.00	1.00
##000000	4.58	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4A7CCF

Deuteranopia (green-blind)

#316FCA

Tritanopia (blue-blind)

#008896

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3f74cc;
/* rgb */ color: rgb(63, 116, 204);
/* oklch */ color: oklch(56.7% 0.148 260.0);

Tailwind

colors: {
  custom: {
    50: '#849bdc',
    500: '#3f74cc',
    950: '#000000',
  },
}

SCSS

$custom: #3f74cc;
$custom-light: #849bdc;
$custom-dark: #000000;

JSON

{
  "hex": "#3f74cc",
  "rgb": {
    "r": 63,
    "g": 116,
    "b": 204
  },
  "hsl": {
    "h": 217.447,
    "s": 58.025,
    "l": 52.353
  },
  "oklch": {
    "l": 0.56717,
    "c": 0.14755,
    "h": 260
  },
  "luminance": 0.17907
}

Semantic roles & 50–950 ramp

primary

#3F74CC

secondary

#D2BB95

accent

#A747E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F74CC

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

Preview Lab → · Contrast checker → · Palette generator →