#3978D7#3978D7

#3978D7 is a mid, vivid blue. Relative luminance 0.192; OKLCH L 58.1% C 0.160 H 258.6°. Best body text is #000000 at 4.84:1 contrast (WCAG AA passes).

Color values

HEX	#3978D7
RGB	rgb(57, 120, 215)
HSL	hsl(216, 66%, 53%)
HSV	hsv(216, 73%, 84%)
CMYK	cmyk(73.5%, 44.2%, 0%, 15.7%)
CIE-LAB	lab(50.93, 12.17, -54.63)
CIE-LCH	lch(50.93, 55.97, 282.56°)
OKLab	oklab(58.06% -0.0315 -0.1564)
OKLCH	oklch(58.06% 0.16 258.6)
XYZ	xyz(20.6651, 19.2068, 66.8950)
Luminance	0.1921 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3978D7 #D79839

analogous

#39C7D7 #3978D7 #4939D7

triadic

#3978D7 #D73978 #78D739

tetradic

#3978D7 #D739C7 #D79839 #39D749

square

#3978D7 #D739C7 #D79839 #39D749

split-complementary

#3978D7 #D74939 #C7D739

monochromatic

#19417C #235BAF #3978D7 #6C9BE1 #9FBDEC

Accessibility & contrast

On white

4.34

#3978D7 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.84

#3978D7 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3978D7

4.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3978D7	#FFFFFF	#000000	##000000
##3978D7	1.00	4.34	4.84	4.84
#FFFFFF	4.34	1.00	21.00	21.00
#000000	4.84	21.00	1.00	1.00
##000000	4.84	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4881DB

Deuteranopia (green-blind)

#2973D5

Tritanopia (blue-blind)

#008E9D

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #3978d7;
/* rgb */ color: rgb(57, 120, 215);
/* oklch */ color: oklch(58.1% 0.160 258.6);

Tailwind

colors: {
  custom: {
    50: '#839ee4',
    500: '#3978d7',
    950: '#000000',
  },
}

SCSS

$custom: #3978d7;
$custom-light: #839ee4;
$custom-dark: #000000;

JSON

{
  "hex": "#3978d7",
  "rgb": {
    "r": 57,
    "g": 120,
    "b": 215
  },
  "hsl": {
    "h": 216.076,
    "s": 66.387,
    "l": 53.333
  },
  "oklch": {
    "l": 0.5806,
    "c": 0.1596,
    "h": 258.6
  },
  "luminance": 0.19209
}

Semantic roles & 50–950 ramp

primary

#3978D7

secondary

#D8BD94

accent

#A53EE9

background

#F8F9FE

surface

#F0F2FC

border

#CBCCD5

text

#0C0E15

muted

#7D7E84

Preview Lab

Preview with #3978D7

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

Preview Lab → · Contrast checker → · Palette generator →