#1F3F8B#1F3F8B

#1F3F8B is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.1% C 0.132 H 264.0°. Best body text is #FFFFFF at 9.80:1 contrast (WCAG AA passes).

Color values

HEX	#1F3F8B
RGB	rgb(31, 63, 139)
HSL	hsl(222, 64%, 33%)
HSV	hsv(222, 78%, 55%)
CMYK	cmyk(77.7%, 54.7%, 0%, 45.5%)
CIE-LAB	lab(28.67, 17.06, -45.71)
CIE-LCH	lch(28.67, 48.79, 290.47°)
OKLab	oklab(39.11% -0.0138 -0.1317)
OKLCH	oklch(39.11% 0.132 264)
XYZ	xyz(7.0011, 5.7096, 25.1542)
Luminance	0.0571 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3F8B #8B6B1F

analogous

#1F758B #1F3F8B #351F8B

triadic

#1F3F8B #8B1F3F #3F8B1F

tetradic

#1F3F8B #8B1F75 #8B6B1F #1F8B35

square

#1F3F8B #8B1F75 #8B6B1F #1F8B35

split-complementary

#1F3F8B #8B351F #758B1F

monochromatic

#091227 #142859 #1F3F8B #2A56BD #4D76D7

Accessibility & contrast

On white

9.80

#1F3F8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#1F3F8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3F8B

9.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3F8B	#FFFFFF	#000000	##FFFFFF
##1F3F8B	1.00	9.80	2.14	9.80
#FFFFFF	9.80	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#05498E

Deuteranopia (green-blind)

#003F89

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1f3f8b;
/* rgb */ color: rgb(31, 63, 139);
/* oklch */ color: oklch(39.1% 0.132 264.0);

Tailwind

colors: {
  custom: {
    50: '#6c73ad',
    500: '#1f3f8b',
    950: '#000000',
  },
}

SCSS

$custom: #1f3f8b;
$custom-light: #6c73ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3f8b",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 139
  },
  "hsl": {
    "h": 222.222,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.39111,
    "c": 0.13238,
    "h": 264
  },
  "luminance": 0.0571
}

Semantic roles & 50–950 ramp

primary

#1F3F8B

secondary

#BA994C

accent

#B641E7

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1F3F8B

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

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