#51AAE9#51AAE9

#51AAE9 is a light, vivid cyan. Relative luminance 0.364; OKLCH L 71.0% C 0.126 H 242.3°. Best body text is #000000 at 8.28:1 contrast (WCAG AA passes).

Color values

HEX	#51AAE9
RGB	rgb(81, 170, 233)
HSL	hsl(205, 78%, 62%)
HSV	hsv(205, 65%, 91%)
CMYK	cmyk(65.2%, 27%, 0%, 8.6%)
CIE-LAB	lab(66.81, -7.40, -39.47)
CIE-LCH	lch(66.81, 40.16, 259.38°)
OKLab	oklab(71.01% -0.0584 -0.1112)
OKLCH	oklch(71.01% 0.126 242.3)
XYZ	xyz(32.4705, 36.3786, 82.3855)
Luminance	0.3638 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51AAE9 #E99051

analogous

#51E9DC #51AAE9 #515EE9

triadic

#51AAE9 #E951AA #AAE951

tetradic

#51AAE9 #DC51E9 #E99051 #5EE951

square

#51AAE9 #DC51E9 #E99051 #5EE951

split-complementary

#51AAE9 #E9515E #E9DC51

monochromatic

#166DAA #1C8FE0 #51AAE9 #87C5F0 #BEDFF7

Accessibility & contrast

On white

2.54

#51AAE9 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.28

#51AAE9 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51AAE9

8.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51AAE9	#FFFFFF	#000000	##000000
##51AAE9	1.00	2.54	8.28	8.28
#FFFFFF	2.54	1.00	21.00	21.00
#000000	8.28	21.00	1.00	1.00
##000000	8.28	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#8EABEC

Deuteranopia (green-blind)

#799CE8

Tritanopia (blue-blind)

#00B9C0

Achromatopsia (no color)

#A3A3A3

Design tokens & code

CSS

--color: #51aae9;
/* rgb */ color: rgb(81, 170, 233);
/* oklch */ color: oklch(71.0% 0.126 242.3);

Tailwind

colors: {
  custom: {
    50: '#90c3f0',
    500: '#51aae9',
    950: '#000000',
  },
}

SCSS

$custom: #51aae9;
$custom-light: #90c3f0;
$custom-dark: #000000;

JSON

{
  "hex": "#51aae9",
  "rgb": {
    "r": 81,
    "g": 170,
    "b": 233
  },
  "hsl": {
    "h": 204.868,
    "s": 77.551,
    "l": 61.569
  },
  "oklch": {
    "l": 0.71014,
    "c": 0.12562,
    "h": 242.3
  },
  "luminance": 0.36382
}

Semantic roles & 50–950 ramp

primary

#51AAE9

secondary

#E7C6AF

accent

#610CDA

background

#F9FBFE

surface

#F2F7FD

border

#CCD0D5

text

#0E1216

muted

#7E8184

Preview Lab

Preview with #51AAE9

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

Preview Lab → · Contrast checker → · Palette generator →