#3F74BF#3F74BF

#3F74BF is a mid, vivid blue. Relative luminance 0.173; OKLCH L 55.9% C 0.130 H 257.4°. Best body text is #FFFFFF at 4.71:1 contrast (WCAG AA passes).

Color values

HEX	#3F74BF
RGB	rgb(63, 116, 191)
HSL	hsl(215, 50%, 50%)
HSV	hsv(215, 67%, 75%)
CMYK	cmyk(67%, 39.3%, 0%, 25.1%)
CIE-LAB	lab(48.65, 6.86, -44.56)
CIE-LCH	lch(48.65, 45.09, 278.76°)
OKLab	oklab(55.91% -0.0284 -0.1269)
OKLCH	oklch(55.91% 0.13 257.4)
XYZ	xyz(17.6959, 17.3074, 51.6882)
Luminance	0.1731 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F74BF #BF8A3F

analogous

#3FB4BF #3F74BF #4A3FBF

triadic

#3F74BF #BF3F74 #74BF3F

tetradic

#3F74BF #BF3FB4 #BF8A3F #3FBF4A

square

#3F74BF #BF3FB4 #BF8A3F #3FBF4A

split-complementary

#3F74BF #BF4A3F #B4BF3F

monochromatic

#213C63 #305891 #3F74BF #6D95CF #9BB6DE

Accessibility & contrast

On white

4.71

#3F74BF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.46

#3F74BF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F74BF

4.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F74BF	#FFFFFF	#000000	##FFFFFF
##3F74BF	1.00	4.71	4.46	4.71
#FFFFFF	4.71	1.00	21.00	1.00
#000000	4.46	21.00	1.00	21.00
##FFFFFF	4.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#527AC2

Deuteranopia (green-blind)

#3F6EBD

Tritanopia (blue-blind)

#008590

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #3f74bf;
/* rgb */ color: rgb(63, 116, 191);
/* oklch */ color: oklch(55.9% 0.130 257.4);

Tailwind

colors: {
  custom: {
    50: '#819bd3',
    500: '#3f74bf',
    950: '#000000',
  },
}

SCSS

$custom: #3f74bf;
$custom-light: #819bd3;
$custom-dark: #000000;

JSON

{
  "hex": "#3f74bf",
  "rgb": {
    "r": 63,
    "g": 116,
    "b": 191
  },
  "hsl": {
    "h": 215.156,
    "s": 50.394,
    "l": 49.804
  },
  "oklch": {
    "l": 0.55908,
    "c": 0.13,
    "h": 257.4
  },
  "luminance": 0.17309
}

Semantic roles & 50–950 ramp

primary

#3F74BF

secondary

#CAB290

accent

#A04EDA

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0B0E14

muted

#7C7E83

Preview Lab

Preview with #3F74BF

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

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