#51B3EF#51B3EF

#51B3EF is a light, vivid cyan. Relative luminance 0.402; OKLCH L 73.3% C 0.126 H 238.8°. Best body text is #000000 at 9.04:1 contrast (WCAG AA passes).

Color values

HEX	#51B3EF
RGB	rgb(81, 179, 239)
HSL	hsl(203, 83%, 63%)
HSV	hsv(203, 66%, 94%)
CMYK	cmyk(66.1%, 25.1%, 0%, 6.3%)
CIE-LAB	lab(69.62, -10.39, -38.36)
CIE-LCH	lch(69.62, 39.74, 254.84°)
OKLab	oklab(73.33% -0.0655 -0.1079)
OKLCH	oklch(73.33% 0.126 238.8)
XYZ	xyz(35.0874, 40.2178, 87.5583)
Luminance	0.4022 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B3EF #EF8D51

analogous

#51EFDC #51B3EF #5164EF

triadic

#51B3EF #EF51B3 #B3EF51

tetradic

#51B3EF #DC51EF #EF8D51 #64EF51

square

#51B3EF #DC51EF #EF8D51 #64EF51

split-complementary

#51B3EF #EF5164 #EFDC51

monochromatic

#1177B5 #199BEA #51B3EF #89CBF4 #C1E4F9

Accessibility & contrast

On white

2.32

#51B3EF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.04

#51B3EF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B3EF

9.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B3EF	#FFFFFF	#000000	##000000
##51B3EF	1.00	2.32	9.04	9.04
#FFFFFF	2.32	1.00	21.00	21.00
#000000	9.04	21.00	1.00	1.00
##000000	9.04	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#97B3F2

Deuteranopia (green-blind)

#82A3EE

Tritanopia (blue-blind)

#00C2C8

Achromatopsia (no color)

#AAAAAA

Design tokens & code

CSS

--color: #51b3ef;
/* rgb */ color: rgb(81, 179, 239);
/* oklch */ color: oklch(73.3% 0.126 238.8);

Tailwind

colors: {
  custom: {
    50: '#92c9f4',
    500: '#51b3ef',
    950: '#000000',
  },
}

SCSS

$custom: #51b3ef;
$custom-light: #92c9f4;
$custom-dark: #000000;

JSON

{
  "hex": "#51b3ef",
  "rgb": {
    "r": 81,
    "g": 179,
    "b": 239
  },
  "hsl": {
    "h": 202.785,
    "s": 83.158,
    "l": 62.745
  },
  "oklch": {
    "l": 0.73329,
    "c": 0.12621,
    "h": 238.8
  },
  "luminance": 0.40222
}

Semantic roles & 50–950 ramp

primary

#51B3EF

secondary

#EAC7B1

accent

#5906E0

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0E1317

muted

#7E8285

Preview Lab

Preview with #51B3EF

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

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