#1F398D#1F398D

#1F398D is a dark, vivid blue. Relative luminance 0.051; OKLCH L 38.0% C 0.143 H 266.4°. Best body text is #FFFFFF at 10.35:1 contrast (WCAG AA passes).

Color values

HEX	#1F398D
RGB	rgb(31, 57, 141)
HSL	hsl(226, 64%, 34%)
HSV	hsv(226, 78%, 55%)
CMYK	cmyk(78%, 59.6%, 0%, 44.7%)
CIE-LAB	lab(27.13, 22.01, -49.44)
CIE-LCH	lch(27.13, 54.12, 294.00°)
OKLab	oklab(38% -0.009 -0.1427)
OKLCH	oklch(38% 0.143 266.4)
XYZ	xyz(6.8342, 5.1399, 25.8261)
Luminance	0.0514 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F398D #8D731F

analogous

#1F708D #1F398D #3C1F8D

triadic

#1F398D #8D1F39 #398D1F

tetradic

#1F398D #8D1F70 #8D731F #1F8D3C

square

#1F398D #8D1F70 #8D731F #1F8D3C

split-complementary

#1F398D #8D3C1F #708D1F

monochromatic

#091029 #14255B #1F398D #2A4DBF #4E6FD8

Accessibility & contrast

On white

10.35

#1F398D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#1F398D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F398D

10.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F398D	#FFFFFF	#000000	##FFFFFF
##1F398D	1.00	10.35	2.03	10.35
#FFFFFF	10.35	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.35	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004590

Deuteranopia (green-blind)

#003B8B

Tritanopia (blue-blind)

#004E5D

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f398d;
/* rgb */ color: rgb(31, 57, 141);
/* oklch */ color: oklch(38.0% 0.143 266.4);

Tailwind

colors: {
  custom: {
    50: '#6d6faf',
    500: '#1f398d',
    950: '#000000',
  },
}

SCSS

$custom: #1f398d;
$custom-light: #6d6faf;
$custom-dark: #000000;

JSON

{
  "hex": "#1f398d",
  "rgb": {
    "r": 31,
    "g": 57,
    "b": 141
  },
  "hsl": {
    "h": 225.818,
    "s": 63.953,
    "l": 33.725
  },
  "oklch": {
    "l": 0.38002,
    "c": 0.14302,
    "h": 266.4
  },
  "luminance": 0.05141
}

Semantic roles & 50–950 ramp

primary

#1F398D

secondary

#BBA14D

accent

#C041E7

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1F398D

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

Preview Lab → · Contrast checker → · Palette generator →