#3978B3#3978B3

#3978B3 is a mid, moderate cyan. Relative luminance 0.176; OKLCH L 55.9% C 0.113 H 249.2°. Best body text is #FFFFFF at 4.65:1 contrast (WCAG AA passes).

Color values

HEX	#3978B3
RGB	rgb(57, 120, 179)
HSL	hsl(209, 52%, 46%)
HSV	hsv(209, 68%, 70%)
CMYK	cmyk(68.2%, 33%, 0%, 29.8%)
CIE-LAB	lab(48.95, -0.83, -37.16)
CIE-LCH	lch(48.95, 37.17, 268.71°)
OKLab	oklab(55.88% -0.04 -0.1052)
OKLCH	oklch(55.88% 0.113 249.2)
XYZ	xyz(16.5375, 17.5557, 45.1561)
Luminance	0.1756 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3978B3 #B37439

analogous

#39B3B1 #3978B3 #393BB3

triadic

#3978B3 #B33978 #78B339

tetradic

#3978B3 #B139B3 #B37439 #3BB339

square

#3978B3 #B139B3 #B37439 #3BB339

split-complementary

#3978B3 #B3393B #B3B139

monochromatic

#1B3A56 #2A5985 #3978B3 #5E96CC #8CB4DA

Accessibility & contrast

On white

4.65

#3978B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.51

#3978B3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3978B3

4.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3978B3	#FFFFFF	#000000	##FFFFFF
##3978B3	1.00	4.65	4.51	4.65
#FFFFFF	4.65	1.00	21.00	1.00
#000000	4.51	21.00	1.00	21.00
##FFFFFF	4.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5E7BB6

Deuteranopia (green-blind)

#4D6FB2

Tritanopia (blue-blind)

#00868D

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #3978b3;
/* rgb */ color: rgb(57, 120, 179);
/* oklch */ color: oklch(55.9% 0.113 249.2);

Tailwind

colors: {
  custom: {
    50: '#7d9eca',
    500: '#3978b3',
    950: '#000000',
  },
}

SCSS

$custom: #3978b3;
$custom-light: #7d9eca;
$custom-dark: #000000;

JSON

{
  "hex": "#3978b3",
  "rgb": {
    "r": 57,
    "g": 120,
    "b": 179
  },
  "hsl": {
    "h": 209.016,
    "s": 51.695,
    "l": 46.275
  },
  "oklch": {
    "l": 0.55879,
    "c": 0.11259,
    "h": 249.2
  },
  "luminance": 0.17557
}

Semantic roles & 50–950 ramp

primary

#3978B3

secondary

#C5A383

accent

#924DDB

background

#F8F9FC

surface

#EFF2F8

border

#CACCD1

text

#0B0E13

muted

#7C7E82

Preview Lab

Preview with #3978B3

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

Preview Lab → · Contrast checker → · Palette generator →