#3F48B2#3F48B2

#3F48B2 is a mid, vivid blue. Relative luminance 0.089; OKLCH L 45.9% C 0.166 H 274.1°. Best body text is #FFFFFF at 7.55:1 contrast (WCAG AA passes).

Color values

HEX	#3F48B2
RGB	rgb(63, 72, 178)
HSL	hsl(235, 48%, 47%)
HSV	hsv(235, 65%, 70%)
CMYK	cmyk(64.6%, 59.6%, 0%, 30.2%)
CIE-LAB	lab(35.80, 30.32, -57.62)
CIE-LCH	lch(35.80, 65.11, 297.75°)
OKLab	oklab(45.86% 0.0119 -0.1659)
OKLCH	oklch(45.86% 0.166 274.1)
XYZ	xyz(12.4005, 8.9048, 43.1762)
Luminance	0.0891 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 5.79

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F48B2 #B2A93F

analogous

#3F82B2 #3F48B2 #6F3FB2

triadic

#3F48B2 #B23F48 #48B23F

tetradic

#3F48B2 #B23F82 #B2A93F #3FB26F

square

#3F48B2 #B23F82 #B2A93F #3FB26F

split-complementary

#3F48B2 #B26F3F #82B23F

monochromatic

#1F2358 #2F3685 #3F48B2 #666DC9 #9398D9

Accessibility & contrast

On white

7.55

#3F48B2 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.78

#3F48B2 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F48B2

7.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F48B2	#FFFFFF	#000000	##FFFFFF
##3F48B2	1.00	7.55	2.78	7.55
#FFFFFF	7.55	1.00	21.00	1.00
#000000	2.78	21.00	1.00	21.00
##FFFFFF	7.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0059B6

Deuteranopia (green-blind)

#004FB0

Tritanopia (blue-blind)

#006276

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #3f48b2;
/* rgb */ color: rgb(63, 72, 178);
/* oklch */ color: oklch(45.9% 0.166 274.1);

Tailwind

colors: {
  custom: {
    50: '#817bca',
    500: '#3f48b2',
    950: '#000000',
  },
}

SCSS

$custom: #3f48b2;
$custom-light: #817bca;
$custom-dark: #000000;

JSON

{
  "hex": "#3f48b2",
  "rgb": {
    "r": 63,
    "g": 72,
    "b": 178
  },
  "hsl": {
    "h": 235.304,
    "s": 47.718,
    "l": 47.255
  },
  "oklch": {
    "l": 0.4586,
    "c": 0.16629,
    "h": 274.1
  },
  "luminance": 0.08906
}

Semantic roles & 50–950 ramp

primary

#3F48B2

secondary

#C4BF89

accent

#CD50D7

background

#F8F7FC

surface

#F0EDF8

border

#CBC8D1

text

#0B0913

muted

#7C7B82

Preview Lab

Preview with #3F48B2

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

Preview Lab → · Contrast checker → · Palette generator →