#1F438B#1F438B

#1F438B is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.0% C 0.127 H 262.3°. Best body text is #FFFFFF at 9.40:1 contrast (WCAG AA passes).

Color values

HEX	#1F438B
RGB	rgb(31, 67, 139)
HSL	hsl(220, 64%, 33%)
HSV	hsv(220, 78%, 55%)
CMYK	cmyk(77.7%, 51.8%, 0%, 45.5%)
CIE-LAB	lab(29.83, 14.30, -43.82)
CIE-LCH	lch(29.83, 46.09, 288.07°)
OKLab	oklab(40% -0.0171 -0.126)
OKLCH	oklch(40% 0.127 262.3)
XYZ	xyz(7.2308, 6.1689, 25.2307)
Luminance	0.0617 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F438B #8B671F

analogous

#1F798B #1F438B #311F8B

triadic

#1F438B #8B1F43 #438B1F

tetradic

#1F438B #8B1F79 #8B671F #1F8B31

square

#1F438B #8B1F79 #8B671F #1F8B31

split-complementary

#1F438B #8B311F #798B1F

monochromatic

#091327 #142B59 #1F438B #2A5BBD #4D7BD7

Accessibility & contrast

On white

9.40

#1F438B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#1F438B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F438B

9.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F438B	#FFFFFF	#000000	##FFFFFF
##1F438B	1.00	9.40	2.23	9.40
#FFFFFF	9.40	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#164C8E

Deuteranopia (green-blind)

#00428A

Tritanopia (blue-blind)

#005460

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1f438b;
/* rgb */ color: rgb(31, 67, 139);
/* oklch */ color: oklch(40.0% 0.127 262.3);

Tailwind

colors: {
  custom: {
    50: '#6b76ad',
    500: '#1f438b',
    950: '#000000',
  },
}

SCSS

$custom: #1f438b;
$custom-light: #6b76ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f438b",
  "rgb": {
    "r": 31,
    "g": 67,
    "b": 139
  },
  "hsl": {
    "h": 220,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.39998,
    "c": 0.12718,
    "h": 262.3
  },
  "luminance": 0.0617
}

Semantic roles & 50–950 ramp

primary

#1F438B

secondary

#BA954C

accent

#AF41E7

background

#F6F7FA

surface

#ECEDF4

border

#C7C8CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1F438B

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

Preview Lab → · Contrast checker → · Palette generator →