#3F40BA#3F40BA

#3F40BA is a mid, vivid blue. Relative luminance 0.083; OKLCH L 45.1% C 0.187 H 275.6°. Best body text is #FFFFFF at 7.91:1 contrast (WCAG AA passes).

Color values

HEX	#3F40BA
RGB	rgb(63, 64, 186)
HSL	hsl(240, 49%, 49%)
HSV	hsv(240, 66%, 73%)
CMYK	cmyk(66.1%, 65.6%, 0%, 27.1%)
CIE-LAB	lab(34.53, 38.09, -64.42)
CIE-LCH	lch(34.53, 74.84, 300.60°)
OKLab	oklab(45.14% 0.0181 -0.1859)
OKLCH	oklch(45.14% 0.187 275.6)
XYZ	xyz(12.7433, 8.2676, 47.3691)
Luminance	0.0827 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F40BA #BAB93F

analogous

#3F7EBA #3F40BA #7C3FBA

triadic

#3F40BA #BA3F40 #40BA3F

tetradic

#3F40BA #BA3F7E #BAB93F #3FBA7C

square

#3F40BA #BA3F7E #BAB93F #3FBA7C

split-complementary

#3F40BA #BA7C3F #7EBA3F

monochromatic

#20215F #30308C #3F40BA #6A6BCC #9798DC

Accessibility & contrast

On white

7.91

#3F40BA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.65

#3F40BA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F40BA

7.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40BA	#FFFFFF	#000000	##FFFFFF
##3F40BA	1.00	7.91	2.65	7.91
#FFFFFF	7.91	1.00	21.00	1.00
#000000	2.65	21.00	1.00	21.00
##FFFFFF	7.91	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0057BE

Deuteranopia (green-blind)

#004CB8

Tritanopia (blue-blind)

#006077

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #3f40ba;
/* rgb */ color: rgb(63, 64, 186);
/* oklch */ color: oklch(45.1% 0.187 275.6);

Tailwind

colors: {
  custom: {
    50: '#8375d0',
    500: '#3f40ba',
    950: '#000000',
  },
}

SCSS

$custom: #3f40ba;
$custom-light: #8375d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40ba",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 186
  },
  "hsl": {
    "h": 239.512,
    "s": 49.398,
    "l": 48.824
  },
  "oklch": {
    "l": 0.45135,
    "c": 0.18674,
    "h": 275.6
  },
  "luminance": 0.08269
}

Semantic roles & 50–950 ramp

primary

#3F40BA

secondary

#C8C78D

accent

#D84FD9

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #3F40BA

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

Preview Lab → · Contrast checker → · Palette generator →