#1F397B#1F397B

#1F397B is a dark, moderate blue. Relative luminance 0.046; OKLCH L 36.5% C 0.117 H 264.9°. Best body text is #FFFFFF at 10.88:1 contrast (WCAG AA passes).

Color values

HEX	#1F397B
RGB	rgb(31, 57, 123)
HSL	hsl(223, 60%, 30%)
HSV	hsv(223, 75%, 48%)
CMYK	cmyk(74.8%, 53.7%, 0%, 51.8%)
CIE-LAB	lab(25.70, 14.82, -40.51)
CIE-LCH	lch(25.70, 43.14, 290.10°)
OKLab	oklab(36.48% -0.0103 -0.1165)
OKLCH	oklch(36.48% 0.117 264.9)
XYZ	xyz(5.6021, 4.6470, 19.3368)
Luminance	0.0465 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F397B #7B611F

analogous

#1F677B #1F397B #331F7B

triadic

#1F397B #7B1F39 #397B1F

tetradic

#1F397B #7B1F67 #7B611F #1F7B33

square

#1F397B #7B1F67 #7B611F #1F7B33

split-complementary

#1F397B #7B331F #677B1F

monochromatic

#060C19 #13224A #1F397B #2B50AC #446CD0

Accessibility & contrast

On white

10.88

#1F397B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#1F397B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F397B

10.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F397B	#FFFFFF	#000000	##FFFFFF
##1F397B	1.00	10.88	1.93	10.88
#FFFFFF	10.88	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0E417D

Deuteranopia (green-blind)

#00397A

Tritanopia (blue-blind)

#004954

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1f397b;
/* rgb */ color: rgb(31, 57, 123);
/* oklch */ color: oklch(36.5% 0.117 264.9);

Tailwind

colors: {
  custom: {
    50: '#686ea2',
    500: '#1f397b',
    950: '#000000',
  },
}

SCSS

$custom: #1f397b;
$custom-light: #686ea2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f397b",
  "rgb": {
    "r": 31,
    "g": 57,
    "b": 123
  },
  "hsl": {
    "h": 223.043,
    "s": 59.74,
    "l": 30.196
  },
  "oklch": {
    "l": 0.36479,
    "c": 0.11695,
    "h": 264.9
  },
  "luminance": 0.04648
}

Semantic roles & 50–950 ramp

primary

#1F397B

secondary

#AE9148

accent

#B645E3

background

#F6F6FA

surface

#EBEBF3

border

#C6C6CD

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1F397B

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

Preview Lab → · Contrast checker → · Palette generator →