#1F539F#1F539F

#1F539F is a mid, vivid blue. Relative luminance 0.090; OKLCH L 45.1% C 0.135 H 258.4°. Best body text is #FFFFFF at 7.51:1 contrast (WCAG AA passes).

Color values

HEX	#1F539F
RGB	rgb(31, 83, 159)
HSL	hsl(216, 67%, 37%)
HSV	hsv(216, 81%, 62%)
CMYK	cmyk(80.5%, 47.8%, 0%, 37.6%)
CIE-LAB	lab(35.95, 11.46, -46.13)
CIE-LCH	lch(35.95, 47.53, 283.95°)
OKLab	oklab(45.13% -0.0273 -0.1325)
OKLCH	oklch(45.13% 0.135 258.4)
XYZ	xyz(9.9140, 8.9798, 34.0049)
Luminance	0.0898 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F539F #9F6B1F

analogous

#1F939F #1F539F #2B1F9F

triadic

#1F539F #9F1F53 #539F1F

tetradic

#1F539F #9F1F93 #9F6B1F #1F9F2B

square

#1F539F #9F1F93 #9F6B1F #1F9F2B

split-complementary

#1F539F #9F2B1F #939F1F

monochromatic

#0B1E39 #15386C #1F539F #296ED2 #5A90DF

Accessibility & contrast

On white

7.51

#1F539F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.80

#1F539F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F539F

7.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F539F	#FFFFFF	#000000	##FFFFFF
##1F539F	1.00	7.51	2.80	7.51
#FFFFFF	7.51	1.00	21.00	1.00
#000000	2.80	21.00	1.00	21.00
##FFFFFF	7.51	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#295BA2

Deuteranopia (green-blind)

#014F9D

Tritanopia (blue-blind)

#006571

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #1f539f;
/* rgb */ color: rgb(31, 83, 159);
/* oklch */ color: oklch(45.1% 0.135 258.4);

Tailwind

colors: {
  custom: {
    50: '#7082bc',
    500: '#1f539f',
    950: '#000000',
  },
}

SCSS

$custom: #1f539f;
$custom-light: #7082bc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f539f",
  "rgb": {
    "r": 31,
    "g": 83,
    "b": 159
  },
  "hsl": {
    "h": 215.625,
    "s": 67.368,
    "l": 37.255
  },
  "oklch": {
    "l": 0.4513,
    "c": 0.13529,
    "h": 258.4
  },
  "luminance": 0.08981
}

Semantic roles & 50–950 ramp

primary

#1F539F

secondary

#C39757

accent

#A43EEA

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #1F539F

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

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