#1F389B#1F389B

#1F389B is a dark, vivid blue. Relative luminance 0.055; OKLCH L 39.1% C 0.164 H 267.1°. Best body text is #FFFFFF at 10.01:1 contrast (WCAG AA passes).

Color values

HEX	#1F389B
RGB	rgb(31, 56, 155)
HSL	hsl(228, 67%, 36%)
HSV	hsv(228, 80%, 61%)
CMYK	cmyk(80%, 63.9%, 0%, 39.2%)
CIE-LAB	lab(28.07, 28.17, -56.49)
CIE-LCH	lch(28.07, 63.12, 296.50°)
OKLab	oklab(39.08% -0.0082 -0.1634)
OKLCH	oklch(39.08% 0.164 267.1)
XYZ	xyz(7.8936, 5.4853, 31.6467)
Luminance	0.0549 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F389B #9B821F

analogous

#1F769B #1F389B #441F9B

triadic

#1F389B #9B1F38 #389B1F

tetradic

#1F389B #9B1F76 #9B821F #1F9B44

square

#1F389B #9B1F76 #9B821F #1F9B44

split-complementary

#1F389B #9B441F #769B1F

monochromatic

#0B1335 #152668 #1F389B #294ACE #5772DD

Accessibility & contrast

On white

10.01

#1F389B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#1F389B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F389B

10.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F389B	#FFFFFF	#000000	##FFFFFF
##1F389B	1.00	10.01	2.10	10.01
#FFFFFF	10.01	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	10.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00489E

Deuteranopia (green-blind)

#003D99

Tritanopia (blue-blind)

#005264

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1f389b;
/* rgb */ color: rgb(31, 56, 155);
/* oklch */ color: oklch(39.1% 0.164 267.1);

Tailwind

colors: {
  custom: {
    50: '#706eb9',
    500: '#1f389b',
    950: '#000000',
  },
}

SCSS

$custom: #1f389b;
$custom-light: #706eb9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f389b",
  "rgb": {
    "r": 31,
    "g": 56,
    "b": 155
  },
  "hsl": {
    "h": 227.903,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.39082,
    "c": 0.16364,
    "h": 267.1
  },
  "luminance": 0.05486
}

Semantic roles & 50–950 ramp

primary

#1F389B

secondary

#C1AB55

accent

#C73EEA

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1F389B

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

Preview Lab → · Contrast checker → · Palette generator →