#3F57AA#3F57AA

#3F57AA is a mid, vivid blue. Relative luminance 0.108; OKLCH L 48.2% C 0.136 H 268.8°. Best body text is #FFFFFF at 6.66:1 contrast (WCAG AA passes).

Color values

HEX	#3F57AA
RGB	rgb(63, 87, 170)
HSL	hsl(227, 46%, 46%)
HSV	hsv(227, 63%, 67%)
CMYK	cmyk(62.9%, 48.8%, 0%, 33.3%)
CIE-LAB	lab(39.20, 17.77, -47.39)
CIE-LCH	lch(39.20, 50.61, 290.56°)
OKLab	oklab(48.23% -0.0029 -0.1356)
OKLCH	oklch(48.23% 0.136 268.8)
XYZ	xyz(12.7113, 10.7743, 39.4322)
Luminance	0.1077 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F57AA #AA923F

analogous

#3F8CAA #3F57AA #5C3FAA

triadic

#3F57AA #AA3F57 #57AA3F

tetradic

#3F57AA #AA3F8C #AA923F #3FAA5C

square

#3F57AA #AA3F8C #AA923F #3FAA5C

split-complementary

#3F57AA #AA5C3F #8CAA3F

monochromatic

#1E2951 #2E407D #3F57AA #6278C5 #8E9ED5

Accessibility & contrast

On white

6.66

#3F57AA on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.16

#3F57AA on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F57AA

6.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F57AA	#FFFFFF	#000000	##FFFFFF
##3F57AA	1.00	6.66	3.16	6.66
#FFFFFF	6.66	1.00	21.00	1.00
#000000	3.16	21.00	1.00	21.00
##FFFFFF	6.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C61AD

Deuteranopia (green-blind)

#1758A8

Tritanopia (blue-blind)

#006A78

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #3f57aa;
/* rgb */ color: rgb(63, 87, 170);
/* oklch */ color: oklch(48.2% 0.136 268.8);

Tailwind

colors: {
  custom: {
    50: '#7f86c4',
    500: '#3f57aa',
    950: '#000000',
  },
}

SCSS

$custom: #3f57aa;
$custom-light: #7f86c4;
$custom-dark: #000000;

JSON

{
  "hex": "#3f57aa",
  "rgb": {
    "r": 63,
    "g": 87,
    "b": 170
  },
  "hsl": {
    "h": 226.542,
    "s": 45.923,
    "l": 45.686
  },
  "oklch": {
    "l": 0.48232,
    "c": 0.13561,
    "h": 268.8
  },
  "luminance": 0.10775
}

Semantic roles & 50–950 ramp

primary

#3F57AA

secondary

#C0B385

accent

#B852D6

background

#F8F8FC

surface

#EFEFF8

border

#CACAD1

text

#0B0B13

muted

#7C7C82

Preview Lab

Preview with #3F57AA

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

Preview Lab → · Contrast checker → · Palette generator →