#1F57B3#1F57B3

#1F57B3 is a mid, vivid blue. Relative luminance 0.104; OKLCH L 47.5% C 0.158 H 260.0°. Best body text is #FFFFFF at 6.84:1 contrast (WCAG AA passes).

Color values

HEX	#1F57B3
RGB	rgb(31, 87, 179)
HSL	hsl(217, 70%, 41%)
HSV	hsv(217, 83%, 70%)
CMYK	cmyk(82.7%, 51.4%, 0%, 29.8%)
CIE-LAB	lab(38.48, 16.74, -53.93)
CIE-LCH	lch(38.48, 56.47, 287.24°)
OKLab	oklab(47.52% -0.0273 -0.1554)
OKLCH	oklch(47.52% 0.158 260)
XYZ	xyz(12.1070, 10.3609, 44.0008)
Luminance	0.1036 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F57B3 #B37B1F

analogous

#1FA1B3 #1F57B3 #311FB3

triadic

#1F57B3 #B31F57 #57B31F

tetradic

#1F57B3 #B31FA1 #B37B1F #1FB331

square

#1F57B3 #B31FA1 #B37B1F #1FB331

split-complementary

#1F57B3 #B3311F #A1B31F

monochromatic

#0D244B #163E7F #1F57B3 #3373DC #6897E5

Accessibility & contrast

On white

6.84

#1F57B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.07

#1F57B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1F57B3

6.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F57B3	#FFFFFF	#000000	##FFFFFF
##1F57B3	1.00	6.84	3.07	6.84
#FFFFFF	6.84	1.00	21.00	1.00
#000000	3.07	21.00	1.00	21.00
##FFFFFF	6.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A62B6

Deuteranopia (green-blind)

#0054B1

Tritanopia (blue-blind)

#006D7C

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #1f57b3;
/* rgb */ color: rgb(31, 87, 179);
/* oklch */ color: oklch(47.5% 0.158 260.0);

Tailwind

colors: {
  custom: {
    50: '#7485ca',
    500: '#1f57b3',
    950: '#000000',
  },
}

SCSS

$custom: #1f57b3;
$custom-light: #7485ca;
$custom-dark: #000000;

JSON

{
  "hex": "#1f57b3",
  "rgb": {
    "r": 31,
    "g": 87,
    "b": 179
  },
  "hsl": {
    "h": 217.297,
    "s": 70.476,
    "l": 41.176
  },
  "oklch": {
    "l": 0.47516,
    "c": 0.15776,
    "h": 260
  },
  "luminance": 0.10362
}

Semantic roles & 50–950 ramp

primary

#1F57B3

secondary

#CAA364

accent

#AA3BED

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #1F57B3

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

Preview Lab → · Contrast checker → · Palette generator →