#3F5FBB#3F5FBB

#3F5FBB is a mid, vivid blue. Relative luminance 0.128; OKLCH L 51.1% C 0.149 H 266.7°. Best body text is #FFFFFF at 5.89:1 contrast (WCAG AA passes).

Color values

HEX	#3F5FBB
RGB	rgb(63, 95, 187)
HSL	hsl(225, 50%, 49%)
HSV	hsv(225, 66%, 73%)
CMYK	cmyk(66.3%, 49.2%, 0%, 26.7%)
CIE-LAB	lab(42.50, 18.69, -52.07)
CIE-LCH	lch(42.50, 55.32, 289.74°)
OKLab	oklab(51.1% -0.0087 -0.1492)
OKLCH	oklch(51.1% 0.149 266.7)
XYZ	xyz(15.1086, 12.8276, 48.6838)
Luminance	0.1283 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F5FBB #BB9B3F

analogous

#3F9DBB #3F5FBB #5D3FBB

triadic

#3F5FBB #BB3F5F #5FBB3F

tetradic

#3F5FBB #BB3F9D #BB9B3F #3FBB5D

square

#3F5FBB #BB3F9D #BB9B3F #3FBB5D

split-complementary

#3F5FBB #BB5D3F #9DBB3F

monochromatic

#20305F #30488D #3F5FBB #6A84CD #98AADC

Accessibility & contrast

On white

5.89

#3F5FBB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.57

#3F5FBB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F5FBB

5.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F5FBB	#FFFFFF	#000000	##FFFFFF
##3F5FBB	1.00	5.89	3.57	5.89
#FFFFFF	5.89	1.00	21.00	1.00
#000000	3.57	21.00	1.00	21.00
##FFFFFF	5.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2D6ABE

Deuteranopia (green-blind)

#0B5FB9

Tritanopia (blue-blind)

#007484

Achromatopsia (no color)

#646464

Design tokens & code

CSS

--color: #3f5fbb;
/* rgb */ color: rgb(63, 95, 187);
/* oklch */ color: oklch(51.1% 0.149 266.7);

Tailwind

colors: {
  custom: {
    50: '#818bd0',
    500: '#3f5fbb',
    950: '#000000',
  },
}

SCSS

$custom: #3f5fbb;
$custom-light: #818bd0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f5fbb",
  "rgb": {
    "r": 63,
    "g": 95,
    "b": 187
  },
  "hsl": {
    "h": 224.516,
    "s": 49.6,
    "l": 49.02
  },
  "oklch": {
    "l": 0.51102,
    "c": 0.14948,
    "h": 266.7
  },
  "luminance": 0.12829
}

Semantic roles & 50–950 ramp

primary

#3F5FBB

secondary

#C8B98E

accent

#B54FD9

background

#F8F8FC

surface

#F0F0F9

border

#CBCBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3F5FBB

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

Preview Lab → · Contrast checker → · Palette generator →