#51B5F2#51B5F2

#51B5F2 is a light, vivid cyan. Relative luminance 0.412; OKLCH L 73.9% C 0.128 H 238.7°. Best body text is #000000 at 9.24:1 contrast (WCAG AA passes).

Color values

HEX	#51B5F2
RGB	rgb(81, 181, 242)
HSL	hsl(203, 86%, 63%)
HSV	hsv(203, 67%, 95%)
CMYK	cmyk(66.5%, 25.2%, 0%, 5.1%)
CIE-LAB	lab(70.32, -10.51, -38.90)
CIE-LCH	lch(70.32, 40.30, 254.89°)
OKLab	oklab(73.92% -0.0665 -0.1095)
OKLCH	oklch(73.92% 0.128 238.7)
XYZ	xyz(35.9380, 41.2041, 90.0464)
Luminance	0.4121 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B5F2 #F28E51

analogous

#51F2DE #51B5F2 #5164F2

triadic

#51B5F2 #F251B5 #B5F251

tetradic

#51B5F2 #DE51F2 #F28E51 #64F251

square

#51B5F2 #DE51F2 #F28E51 #64F251

split-complementary

#51B5F2 #F25164 #F2DE51

monochromatic

#0E79BB #189DEE #51B5F2 #8ACDF6 #C3E5FB

Accessibility & contrast

On white

2.27

#51B5F2 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.24

#51B5F2 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B5F2

9.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B5F2	#FFFFFF	#000000	##000000
##51B5F2	1.00	2.27	9.24	9.24
#FFFFFF	2.27	1.00	21.00	21.00
#000000	9.24	21.00	1.00	1.00
##000000	9.24	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#99B5F5

Deuteranopia (green-blind)

#83A5F1

Tritanopia (blue-blind)

#00C4CA

Achromatopsia (no color)

#ACACAC

Design tokens & code

CSS

--color: #51b5f2;
/* rgb */ color: rgb(81, 181, 242);
/* oklch */ color: oklch(73.9% 0.128 238.7);

Tailwind

colors: {
  custom: {
    50: '#92cbf6',
    500: '#51b5f2',
    950: '#000000',
  },
}

SCSS

$custom: #51b5f2;
$custom-light: #92cbf6;
$custom-dark: #000000;

JSON

{
  "hex": "#51b5f2",
  "rgb": {
    "r": 81,
    "g": 181,
    "b": 242
  },
  "hsl": {
    "h": 202.733,
    "s": 86.096,
    "l": 63.333
  },
  "oklch": {
    "l": 0.73921,
    "c": 0.12808,
    "h": 238.7
  },
  "luminance": 0.41208
}

Semantic roles & 50–950 ramp

primary

#51B5F2

secondary

#ECC8B3

accent

#5803E3

background

#F9FCFF

surface

#F2F8FE

border

#CCD1D6

text

#0E1317

muted

#7E8285

Preview Lab

Preview with #51B5F2

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

Preview Lab → · Contrast checker → · Palette generator →