#1F488B#1F488B

#1F488B is a dark, vivid blue. Relative luminance 0.068; OKLCH L 41.1% C 0.121 H 259.8°. Best body text is #FFFFFF at 8.91:1 contrast (WCAG AA passes).

Color values

HEX	#1F488B
RGB	rgb(31, 72, 139)
HSL	hsl(217, 64%, 33%)
HSV	hsv(217, 78%, 55%)
CMYK	cmyk(77.7%, 48.2%, 0%, 45.5%)
CIE-LAB	lab(31.32, 10.87, -41.42)
CIE-LCH	lch(31.32, 42.82, 284.71°)
OKLab	oklab(41.14% -0.0214 -0.1189)
OKLCH	oklch(41.14% 0.121 259.8)
XYZ	xyz(7.5409, 6.7893, 25.3341)
Luminance	0.0679 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F488B #8B621F

analogous

#1F7E8B #1F488B #2C1F8B

triadic

#1F488B #8B1F48 #488B1F

tetradic

#1F488B #8B1F7E #8B621F #1F8B2C

square

#1F488B #8B1F7E #8B621F #1F8B2C

split-complementary

#1F488B #8B2C1F #7E8B1F

monochromatic

#091427 #142E59 #1F488B #2A62BD #4D82D7

Accessibility & contrast

On white

8.91

#1F488B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.36

#1F488B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F488B

8.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F488B	#FFFFFF	#000000	##FFFFFF
##1F488B	1.00	8.91	2.36	8.91
#FFFFFF	8.91	1.00	21.00	1.00
#000000	2.36	21.00	1.00	21.00
##FFFFFF	8.91	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#244F8E

Deuteranopia (green-blind)

#06458A

Tritanopia (blue-blind)

#005862

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #1f488b;
/* rgb */ color: rgb(31, 72, 139);
/* oklch */ color: oklch(41.1% 0.121 259.8);

Tailwind

colors: {
  custom: {
    50: '#6b7aad',
    500: '#1f488b',
    950: '#000000',
  },
}

SCSS

$custom: #1f488b;
$custom-light: #6b7aad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f488b",
  "rgb": {
    "r": 31,
    "g": 72,
    "b": 139
  },
  "hsl": {
    "h": 217.222,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.41138,
    "c": 0.12079,
    "h": 259.8
  },
  "luminance": 0.0679
}

Semantic roles & 50–950 ramp

primary

#1F488B

secondary

#BA904C

accent

#A841E7

background

#F6F7FA

surface

#ECEDF4

border

#C7C8CE

text

#080910

muted

#7A7B7F

Preview Lab

Preview with #1F488B

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

Preview Lab → · Contrast checker → · Palette generator →