#3970BF#3970BF

#3970BF is a mid, vivid blue. Relative luminance 0.162; OKLCH L 54.8% C 0.137 H 257.7°. Best body text is #FFFFFF at 4.95:1 contrast (WCAG AA passes).

Color values

HEX	#3970BF
RGB	rgb(57, 112, 191)
HSL	hsl(215, 54%, 49%)
HSV	hsv(215, 70%, 75%)
CMYK	cmyk(70.2%, 41.4%, 0%, 25.1%)
CIE-LAB	lab(47.26, 8.39, -46.78)
CIE-LCH	lch(47.26, 47.53, 280.17°)
OKLab	oklab(54.77% -0.0291 -0.1335)
OKLCH	oklch(54.77% 0.137 257.7)
XYZ	xyz(16.8821, 16.2180, 51.5208)
Luminance	0.1622 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3970BF #BF8839

analogous

#39B3BF #3970BF #4539BF

triadic

#3970BF #BF3970 #70BF39

tetradic

#3970BF #BF39B3 #BF8839 #39BF45

square

#3970BF #BF39B3 #BF8839 #39BF45

split-complementary

#3970BF #BF4539 #B3BF39

monochromatic

#1D3961 #2B5490 #3970BF #6491D1 #93B2DF

Accessibility & contrast

On white

4.95

#3970BF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.24

#3970BF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3970BF

4.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3970BF	#FFFFFF	#000000	##FFFFFF
##3970BF	1.00	4.95	4.24	4.95
#FFFFFF	4.95	1.00	21.00	1.00
#000000	4.24	21.00	1.00	21.00
##FFFFFF	4.95	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4B77C2

Deuteranopia (green-blind)

#356ABD

Tritanopia (blue-blind)

#00828E

Achromatopsia (no color)

#707070

Design tokens & code

CSS

--color: #3970bf;
/* rgb */ color: rgb(57, 112, 191);
/* oklch */ color: oklch(54.8% 0.137 257.7);

Tailwind

colors: {
  custom: {
    50: '#7f98d3',
    500: '#3970bf',
    950: '#000000',
  },
}

SCSS

$custom: #3970bf;
$custom-light: #7f98d3;
$custom-dark: #000000;

JSON

{
  "hex": "#3970bf",
  "rgb": {
    "r": 57,
    "g": 112,
    "b": 191
  },
  "hsl": {
    "h": 215.373,
    "s": 54.032,
    "l": 48.627
  },
  "oklch": {
    "l": 0.54766,
    "c": 0.13666,
    "h": 257.7
  },
  "luminance": 0.1622
}

Semantic roles & 50–950 ramp

primary

#3970BF

secondary

#CAB08A

accent

#A14ADD

background

#F8F9FD

surface

#EFF2FA

border

#CACCD3

text

#0B0D14

muted

#7C7E83

Preview Lab

Preview with #3970BF

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

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