#3978D3#3978D3

#3978D3 is a mid, vivid blue. Relative luminance 0.190; OKLCH L 57.8% C 0.154 H 257.9°. Best body text is #000000 at 4.80:1 contrast (WCAG AA passes).

Color values

HEX	#3978D3
RGB	rgb(57, 120, 211)
HSL	hsl(215, 64%, 53%)
HSV	hsv(215, 73%, 83%)
CMYK	cmyk(73%, 43.1%, 0%, 17.3%)
CIE-LAB	lab(50.69, 10.71, -52.74)
CIE-LCH	lch(50.69, 53.82, 281.48°)
OKLab	oklab(57.8% -0.0323 -0.1509)
OKLCH	oklch(57.8% 0.154 257.9)
XYZ	xyz(20.1574, 19.0037, 64.2211)
Luminance	0.1901 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3978D3 #D39439

analogous

#39C5D3 #3978D3 #4739D3

triadic

#3978D3 #D33978 #78D339

tetradic

#3978D3 #D339C5 #D39439 #39D347

square

#3978D3 #D339C5 #D39439 #39D347

split-complementary

#3978D3 #D34739 #C5D339

monochromatic

#1A4077 #265BA9 #3978D3 #6B9ADE #9DBCE9

Accessibility & contrast

On white

4.37

#3978D3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.80

#3978D3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3978D3

4.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3978D3	#FFFFFF	#000000	##000000
##3978D3	1.00	4.37	4.80	4.80
#FFFFFF	4.37	1.00	21.00	21.00
#000000	4.80	21.00	1.00	1.00
##000000	4.80	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4B80D7

Deuteranopia (green-blind)

#2F72D1

Tritanopia (blue-blind)

#008D9B

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #3978d3;
/* rgb */ color: rgb(57, 120, 211);
/* oklch */ color: oklch(57.8% 0.154 257.9);

Tailwind

colors: {
  custom: {
    50: '#839ee1',
    500: '#3978d3',
    950: '#000000',
  },
}

SCSS

$custom: #3978d3;
$custom-light: #839ee1;
$custom-dark: #000000;

JSON

{
  "hex": "#3978d3",
  "rgb": {
    "r": 57,
    "g": 120,
    "b": 211
  },
  "hsl": {
    "h": 215.455,
    "s": 63.636,
    "l": 52.549
  },
  "oklch": {
    "l": 0.57801,
    "c": 0.15432,
    "h": 257.9
  },
  "luminance": 0.19006
}

Semantic roles & 50–950 ramp

primary

#3978D3

secondary

#D5BA92

accent

#A341E7

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3978D3

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

Preview Lab → · Contrast checker → · Palette generator →