#3F73C1#3F73C1

#3F73C1 is a mid, vivid blue. Relative luminance 0.172; OKLCH L 55.8% C 0.134 H 258.4°. Best body text is #FFFFFF at 4.74:1 contrast (WCAG AA passes).

Color values

HEX	#3F73C1
RGB	rgb(63, 115, 193)
HSL	hsl(216, 51%, 50%)
HSV	hsv(216, 67%, 76%)
CMYK	cmyk(67.4%, 40.4%, 0%, 24.3%)
CIE-LAB	lab(48.47, 8.19, -45.99)
CIE-LCH	lch(48.47, 46.72, 280.10°)
OKLab	oklab(55.81% -0.027 -0.1311)
OKLCH	oklch(55.81% 0.134 258.4)
XYZ	xyz(17.8028, 17.1667, 52.8170)
Luminance	0.1717 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F73C1 #C18D3F

analogous

#3FB4C1 #3F73C1 #4C3FC1

triadic

#3F73C1 #C13F73 #73C13F

tetradic

#3F73C1 #C13FB4 #C18D3F #3FC14C

square

#3F73C1 #C13FB4 #C18D3F #3FC14C

split-complementary

#3F73C1 #C14C3F #B4C13F

monochromatic

#213C65 #305793 #3F73C1 #6D95D0 #9CB6DF

Accessibility & contrast

On white

4.74

#3F73C1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.43

#3F73C1 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F73C1

4.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F73C1	#FFFFFF	#000000	##FFFFFF
##3F73C1	1.00	4.74	4.43	4.74
#FFFFFF	4.74	1.00	21.00	1.00
#000000	4.43	21.00	1.00	21.00
##FFFFFF	4.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F7AC4

Deuteranopia (green-blind)

#3B6EBF

Tritanopia (blue-blind)

#008590

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3f73c1;
/* rgb */ color: rgb(63, 115, 193);
/* oklch */ color: oklch(55.8% 0.134 258.4);

Tailwind

colors: {
  custom: {
    50: '#829ad4',
    500: '#3f73c1',
    950: '#000000',
  },
}

SCSS

$custom: #3f73c1;
$custom-light: #829ad4;
$custom-dark: #000000;

JSON

{
  "hex": "#3f73c1",
  "rgb": {
    "r": 63,
    "g": 115,
    "b": 193
  },
  "hsl": {
    "h": 216,
    "s": 51.181,
    "l": 50.196
  },
  "oklch": {
    "l": 0.55808,
    "c": 0.13382,
    "h": 258.4
  },
  "luminance": 0.17168
}

Semantic roles & 50–950 ramp

primary

#3F73C1

secondary

#CBB491

accent

#A24DDB

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0C0E14

muted

#7D7E83

Preview Lab

Preview with #3F73C1

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

Preview Lab → · Contrast checker → · Palette generator →