#3F57BC#3F57BC

#3F57BC is a mid, vivid blue. Relative luminance 0.115; OKLCH L 49.5% C 0.161 H 269.6°. Best body text is #FFFFFF at 6.36:1 contrast (WCAG AA passes).

Color values

HEX	#3F57BC
RGB	rgb(63, 87, 188)
HSL	hsl(228, 50%, 49%)
HSV	hsv(228, 66%, 74%)
CMYK	cmyk(66.5%, 53.7%, 0%, 26.3%)
CIE-LAB	lab(40.41, 24.20, -56.02)
CIE-LCH	lch(40.41, 61.02, 293.36°)
OKLab	oklab(49.54% -0.0012 -0.161)
OKLCH	oklch(49.54% 0.161 269.6)
XYZ	xyz(14.5321, 11.5026, 49.0216)
Luminance	0.1150 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57BC #BCA43F

analogous

#3F96BC #3F57BC #663FBC

triadic

#3F57BC #BC3F57 #57BC3F

tetradic

#3F57BC #BC3F96 #BCA43F #3FBC66

square

#3F57BC #BC3F96 #BCA43F #3FBC66

split-complementary

#3F57BC #BC663F #96BC3F

monochromatic

#202D60 #30428E #3F57BC #6B7ECD #99A6DD

Accessibility & contrast

On white

6.36

#3F57BC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.30

#3F57BC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57BC

6.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57BC	#FFFFFF	#000000	##FFFFFF
##3F57BC	1.00	6.36	3.30	6.36
#FFFFFF	6.36	1.00	21.00	1.00
#000000	3.30	21.00	1.00	21.00
##FFFFFF	6.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0F65C0

Deuteranopia (green-blind)

#005ABA

Tritanopia (blue-blind)

#006F81

Achromatopsia (no color)

#5F5F5F

Design tokens & code

CSS

--color: #3f57bc;
/* rgb */ color: rgb(63, 87, 188);
/* oklch */ color: oklch(49.5% 0.161 269.6);

Tailwind

colors: {
  custom: {
    50: '#8286d1',
    500: '#3f57bc',
    950: '#000000',
  },
}

SCSS

$custom: #3f57bc;
$custom-light: #8286d1;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57bc",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 188
  },
  "hsl": {
    "h": 228.48,
    "s": 49.801,
    "l": 49.216
  },
  "oklch": {
    "l": 0.49542,
    "c": 0.16097,
    "h": 269.6
  },
  "luminance": 0.11504
}

Semantic roles & 50–950 ramp

primary

#3F57BC

secondary

#C9BD8E

accent

#BF4ED9

background

#F8F8FC

surface

#F0EFF9

border

#CBCAD2

text

#0C0B14

muted

#7D7C82

Preview Lab

Preview with #3F57BC

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

Preview Lab → · Contrast checker → · Palette generator →