#3B51BB#3B51BB

#3B51BB is a mid, vivid blue. Relative luminance 0.104; OKLCH L 48.1% C 0.168 H 270.0°. Best body text is #FFFFFF at 6.82:1 contrast (WCAG AA passes).

Color values

HEX	#3B51BB
RGB	rgb(59, 81, 187)
HSL	hsl(230, 52%, 48%)
HSV	hsv(230, 68%, 73%)
CMYK	cmyk(68.4%, 56.7%, 0%, 26.7%)
CIE-LAB	lab(38.55, 27.10, -58.46)
CIE-LCH	lch(38.55, 64.44, 294.87°)
OKLab	oklab(48.06% 0.0001 -0.1683)
OKLCH	oklch(48.06% 0.168 270)
XYZ	xyz(13.7126, 10.4012, 48.2890)
Luminance	0.1040 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3B51BB #BBA53B

analogous

#3B91BB #3B51BB #653BBB

triadic

#3B51BB #BB3B51 #51BB3B

tetradic

#3B51BB #BB3B91 #BBA53B #3BBB65

square

#3B51BB #BB3B91 #BBA53B #3BBB65

split-complementary

#3B51BB #BB653B #91BB3B

monochromatic

#1E295E #2C3D8C #3B51BB #6577CE #93A0DD

Accessibility & contrast

On white

6.82

#3B51BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.08

#3B51BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3B51BB

6.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3B51BB	#FFFFFF	#000000	##FFFFFF
##3B51BB	1.00	6.82	3.08	6.82
#FFFFFF	6.82	1.00	21.00	1.00
#000000	3.08	21.00	1.00	21.00
##FFFFFF	6.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0061BF

Deuteranopia (green-blind)

#0055B9

Tritanopia (blue-blind)

#006B7E

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #3b51bb;
/* rgb */ color: rgb(59, 81, 187);
/* oklch */ color: oklch(48.1% 0.168 270.0);

Tailwind

colors: {
  custom: {
    50: '#8081d0',
    500: '#3b51bb',
    950: '#000000',
  },
}

SCSS

$custom: #3b51bb;
$custom-light: #8081d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3b51bb",
  "rgb": {
    "r": 59,
    "g": 81,
    "b": 187
  },
  "hsl": {
    "h": 229.688,
    "s": 52.033,
    "l": 48.235
  },
  "oklch": {
    "l": 0.48064,
    "c": 0.16832,
    "h": 270
  },
  "luminance": 0.10403
}

Semantic roles & 50–950 ramp

primary

#3B51BB

secondary

#C8BD8A

accent

#C34CDB

background

#F8F7FC

surface

#F0EEF9

border

#CBC9D2

text

#0B0A14

muted

#7C7C82

Preview Lab

Preview with #3B51BB

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

Preview Lab → · Contrast checker → · Palette generator →