#1F458B#1F458B

#1F458B is a dark, vivid blue. Relative luminance 0.064; OKLCH L 40.5% C 0.125 H 261.3°. Best body text is #FFFFFF at 9.20:1 contrast (WCAG AA passes).

Color values

HEX	#1F458B
RGB	rgb(31, 69, 139)
HSL	hsl(219, 64%, 33%)
HSV	hsv(219, 78%, 55%)
CMYK	cmyk(77.7%, 50.4%, 0%, 45.5%)
CIE-LAB	lab(30.43, 12.92, -42.86)
CIE-LCH	lch(30.43, 44.77, 286.78°)
OKLab	oklab(40.45% -0.0188 -0.1232)
OKLCH	oklch(40.45% 0.125 261.3)
XYZ	xyz(7.3517, 6.4108, 25.2710)
Luminance	0.0641 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F458B #8B651F

analogous

#1F7B8B #1F458B #2F1F8B

triadic

#1F458B #8B1F45 #458B1F

tetradic

#1F458B #8B1F7B #8B651F #1F8B2F

square

#1F458B #8B1F7B #8B651F #1F8B2F

split-complementary

#1F458B #8B2F1F #7B8B1F

monochromatic

#091327 #142C59 #1F458B #2A5EBD #4D7ED7

Accessibility & contrast

On white

9.20

#1F458B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.28

#1F458B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F458B

9.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F458B	#FFFFFF	#000000	##FFFFFF
##1F458B	1.00	9.20	2.28	9.20
#FFFFFF	9.20	1.00	21.00	1.00
#000000	2.28	21.00	1.00	21.00
##FFFFFF	9.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1C4D8E

Deuteranopia (green-blind)

#00438A

Tritanopia (blue-blind)

#005661

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #1f458b;
/* rgb */ color: rgb(31, 69, 139);
/* oklch */ color: oklch(40.5% 0.125 261.3);

Tailwind

colors: {
  custom: {
    50: '#6b78ad',
    500: '#1f458b',
    950: '#000000',
  },
}

SCSS

$custom: #1f458b;
$custom-light: #6b78ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f458b",
  "rgb": {
    "r": 31,
    "g": 69,
    "b": 139
  },
  "hsl": {
    "h": 218.889,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.40451,
    "c": 0.1246,
    "h": 261.3
  },
  "luminance": 0.06412
}

Semantic roles & 50–950 ramp

primary

#1F458B

secondary

#BA934C

accent

#AC41E7

background

#F6F7FA

surface

#ECEDF4

border

#C7C8CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1F458B

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

Preview Lab → · Contrast checker → · Palette generator →