#3F40F1#3F40F1

#3F40F1 is a mid, highly saturated blue. Relative luminance 0.111; OKLCH L 50.4% C 0.254 H 272.4°. Best body text is #FFFFFF at 6.53:1 contrast (WCAG AA passes).

Color values

HEX	#3F40F1
RGB	rgb(63, 64, 241)
HSL	hsl(240, 86%, 60%)
HSV	hsv(240, 74%, 95%)
CMYK	cmyk(73.9%, 73.4%, 0%, 5.5%)
CIE-LAB	lab(39.70, 56.08, -87.61)
CIE-LCH	lch(39.70, 104.02, 302.62°)
OKLab	oklab(50.4% 0.0104 -0.2536)
OKLCH	oklch(50.4% 0.254 272.4)
XYZ	xyz(19.7551, 11.0723, 84.2981)
Luminance	0.1107 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F40F1 #F1F03F

analogous

#3F99F1 #3F40F1 #973FF1

triadic

#3F40F1 #F13F40 #40F13F

tetradic

#3F40F1 #F13F99 #F1F03F #3FF197

square

#3F40F1 #F13F99 #F1F03F #3FF197

split-complementary

#3F40F1 #F1973F #99F13F

monochromatic

#0C0DA9 #1112E2 #3F40F1 #7879F5 #B1B1F9

Accessibility & contrast

On white

6.53

#3F40F1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.21

#3F40F1 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F40F1

6.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F40F1	#FFFFFF	#000000	##FFFFFF
##3F40F1	1.00	6.53	3.21	6.53
#FFFFFF	6.53	1.00	21.00	1.00
#000000	3.21	21.00	1.00	21.00
##FFFFFF	6.53	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0066F6

Deuteranopia (green-blind)

#0055EE

Tritanopia (blue-blind)

#007496

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3f40f1;
/* rgb */ color: rgb(63, 64, 241);
/* oklch */ color: oklch(50.4% 0.254 272.4);

Tailwind

colors: {
  custom: {
    50: '#8f77f7',
    500: '#3f40f1',
    950: '#000000',
  },
}

SCSS

$custom: #3f40f1;
$custom-light: #8f77f7;
$custom-dark: #000000;

JSON

{
  "hex": "#3f40f1",
  "rgb": {
    "r": 63,
    "g": 64,
    "b": 241
  },
  "hsl": {
    "h": 239.663,
    "s": 86.408,
    "l": 59.608
  },
  "oklch": {
    "l": 0.50404,
    "c": 0.25377,
    "h": 272.4
  },
  "luminance": 0.11074
}

Semantic roles & 50–950 ramp

primary

#3F40F1

secondary

#E8E8A3

accent

#FB2BFD

background

#F9F7FF

surface

#F2EDFF

border

#CCC8D7

text

#0F0917

muted

#7E7B85

Preview Lab

Preview with #3F40F1

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

Preview Lab → · Contrast checker → · Palette generator →