#3B51CB#3B51CB

#3B51CB is a mid, vivid blue. Relative luminance 0.111; OKLCH L 49.4% C 0.190 H 270.1°. Best body text is #FFFFFF at 6.51:1 contrast (WCAG AA passes).

Color values

HEX	#3B51CB
RGB	rgb(59, 81, 203)
HSL	hsl(231, 58%, 51%)
HSV	hsv(231, 71%, 80%)
CMYK	cmyk(70.9%, 60.1%, 0%, 20.4%)
CIE-LAB	lab(39.79, 32.83, -65.77)
CIE-LCH	lch(39.79, 73.50, 296.52°)
OKLab	oklab(49.37% 0.0003 -0.1898)
OKLCH	oklch(49.37% 0.19 270.1)
XYZ	xyz(15.5219, 11.1249, 57.8176)
Luminance	0.1113 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3B51CB #CBB53B

analogous

#3B99CB #3B51CB #6D3BCB

triadic

#3B51CB #CB3B51 #51CB3B

tetradic

#3B51CB #CB3B99 #CBB53B #3BCB6D

square

#3B51CB #CB3B99 #CBB53B #3BCB6D

split-complementary

#3B51CB #CB6D3B #99CB3B

monochromatic

#1D2A6E #2A3C9F #3B51CB #6B7CD8 #9CA7E5

Accessibility & contrast

On white

6.51

#3B51CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.23

#3B51CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3B51CB

6.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3B51CB	#FFFFFF	#000000	##FFFFFF
##3B51CB	1.00	6.51	3.23	6.51
#FFFFFF	6.51	1.00	21.00	1.00
#000000	3.23	21.00	1.00	21.00
##FFFFFF	6.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0065CF

Deuteranopia (green-blind)

#0057C9

Tritanopia (blue-blind)

#007086

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3b51cb;
/* rgb */ color: rgb(59, 81, 203);
/* oklch */ color: oklch(49.4% 0.190 270.1);

Tailwind

colors: {
  custom: {
    50: '#8481dc',
    500: '#3b51cb',
    950: '#000000',
  },
}

SCSS

$custom: #3b51cb;
$custom-light: #8481dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3b51cb",
  "rgb": {
    "r": 59,
    "g": 81,
    "b": 203
  },
  "hsl": {
    "h": 230.833,
    "s": 58.065,
    "l": 51.373
  },
  "oklch": {
    "l": 0.49373,
    "c": 0.18978,
    "h": 270.1
  },
  "luminance": 0.11126
}

Semantic roles & 50–950 ramp

primary

#3B51CB

secondary

#D1C791

accent

#CA47E1

background

#F8F7FD

surface

#F0EEFB

border

#CBC9D4

text

#0C0A15

muted

#7D7C83

Preview Lab

Preview with #3B51CB

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

Preview Lab → · Contrast checker → · Palette generator →