#3978BB#3978BB

#3978BB is a mid, vivid cyan. Relative luminance 0.179; OKLCH L 56.3% C 0.123 H 252.1°. Best body text is #FFFFFF at 4.59:1 contrast (WCAG AA passes).

Color values

HEX	#3978BB
RGB	rgb(57, 120, 187)
HSL	hsl(211, 53%, 48%)
HSV	hsv(211, 70%, 73%)
CMYK	cmyk(69.5%, 35.8%, 0%, 26.7%)
CIE-LAB	lab(49.36, 2.01, -41.14)
CIE-LCH	lch(49.36, 41.19, 272.80°)
OKLab	oklab(56.33% -0.0378 -0.1169)
OKLCH	oklch(56.33% 0.123 252.1)
XYZ	xyz(17.3701, 17.8888, 49.5415)
Luminance	0.1789 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3978BB #BB7C39

analogous

#39B9BB #3978BB #3B39BB

triadic

#3978BB #BB3978 #78BB39

tetradic

#3978BB #BB39B9 #BB7C39 #39BB3B

square

#3978BB #BB39B9 #BB7C39 #39BB3B

split-complementary

#3978BB #BB3B39 #B9BB39

monochromatic

#1C3C5D #2B5A8C #3978BB #6297CF #91B6DD

Accessibility & contrast

On white

4.59

#3978BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.58

#3978BB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3978BB

4.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3978BB	#FFFFFF	#000000	##FFFFFF
##3978BB	1.00	4.59	4.58	4.59
#FFFFFF	4.59	1.00	21.00	1.00
#000000	4.58	21.00	1.00	21.00
##FFFFFF	4.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5A7CBE

Deuteranopia (green-blind)

#4770BA

Tritanopia (blue-blind)

#008891

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3978bb;
/* rgb */ color: rgb(57, 120, 187);
/* oklch */ color: oklch(56.3% 0.123 252.1);

Tailwind

colors: {
  custom: {
    50: '#7e9ed0',
    500: '#3978bb',
    950: '#000000',
  },
}

SCSS

$custom: #3978bb;
$custom-light: #7e9ed0;
$custom-dark: #000000;

JSON

{
  "hex": "#3978bb",
  "rgb": {
    "r": 57,
    "g": 120,
    "b": 187
  },
  "hsl": {
    "h": 210.923,
    "s": 53.279,
    "l": 47.843
  },
  "oklch": {
    "l": 0.56333,
    "c": 0.12282,
    "h": 252.1
  },
  "luminance": 0.17891
}

Semantic roles & 50–950 ramp

primary

#3978BB

secondary

#C8A987

accent

#964BDD

background

#F8F9FC

surface

#EFF2F9

border

#CACCD2

text

#0B0E14

muted

#7C7E82

Preview Lab

Preview with #3978BB

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

Preview Lab → · Contrast checker → · Palette generator →