Color

#51D9DE

Light cool cyan. Nearest reference color: Medium turquoise.

RGB

0–255

217

222

CMYK

0–100%

63.51%

2.25%

12.94%

RGB describes how #51D9DE is represented with light on digital screens. This color combines red 81, green 217 and blue 222.

CMYK describes the same color using the four components commonly used in printing: cyan 63.51%, magenta 2.25%, yellow 0% and black 12.94%.

HSL values

H 182.13° S 68.12% L 59.41%

In the HSL color model, #51D9DE has a hue of 182.13°, 68.12% saturation and 59.41% lightness. The sliders below show where this color sits across each of these three dimensions.

Color insight

#51D9DE is a light, cool cyan with moderate chroma.

Temperature: Cool
Lightness: Light
Chroma: Moderate

Color formats

Copy #51D9DE in a format ready to use in CSS, design tools or other applications.

HEX #51D9DE

RGB rgb(81, 217, 222)

HSL hsl(182.13 68.12% 59.41%)

OKLCH oklch(0.814283 0.116093 198.595)

CSS --color: #51D9DE;

Tints of #51D9DE

Tints are lighter variations of #51D9DE. They keep the character of the original color while moving progressively toward a lighter appearance.

#BAFDFF #7CFAFF #6BF0F4 #5EE4E9 #51D9DE

Shades of #51D9DE

Shades are darker variations of #51D9DE. Moving toward black increases visual depth while preserving the underlying hue of the color.

#51D9DE #00A0A5 #00676A #003435 #000808

Tones of #51D9DE

Tones reduce the chroma of #51D9DE, producing quieter and more muted variations without simply making the color lighter or darker.

#51D9DE #74D5D8 #8ED0D2 #A3CBCC #B6C6C6

Tonal range of #51D9DE

A continuous light-to-dark scale places #51D9DE between its lighter tints and deeper shades.

#BAFDFF #7CFAFF #6BF0F4 #5EE4E9 #51D9DE #00A0A5 #00676A #003435 #000808

CSS color scale

Use this tonal range as reusable CSS custom properties.

:root {
    --color-100: #BAFDFF;
    --color-200: #7CFAFF;
    --color-300: #6BF0F4;
    --color-400: #5EE4E9;
    --color-500: #51D9DE;
    --color-600: #00A0A5;
    --color-700: #00676A;
    --color-800: #003435;
    --color-900: #000808;
}

Colors that go with #51D9DE

Color harmonies for #51D9DE are generated by rotating its hue in the OKLCH color space while preserving its lightness and chroma. This creates classic complementary, analogous, triadic and other hue relationships with more consistent perceptual balance.

Complementary

Opposite on the color wheel, creating the strongest direct hue contrast.

#51D9DE #FFA6A8

Analogous

Neighboring hues that stay visually close to the original color.

#6CDAB5 #51D9DE #67D1FE

Triadic

Three evenly spaced hues that create a broader, balanced color relationship.

#51D9DE #E2AAF3 #EBB966

Split complementary

Two hues around the complementary color, providing contrast with more variation.

#51D9DE #FAA3CF #FFAB7F

Tetradic

Four related hues forming two complementary pairs on the color wheel.

#51D9DE #BFB8FF #FFA6A8 #C9C86C

CSS gradients with #51D9DE

These gradients show how #51D9DE moves toward white, black and its complementary color. Each gradient includes ready-to-use CSS that can be copied directly into a project.

Toward white

A light gradient that moves from the original color toward white.

#51D9DE #88E3E6 #B4EDEF #DAF6F7 #FFFFFF

background: linear-gradient(90deg, #51D9DE, #88E3E6, #B4EDEF, #DAF6F7, #FFFFFF);

Toward black

A dark gradient that moves from the original color toward black.

#51D9DE #349397 #1A5355 #041B1C #000000

background: linear-gradient(90deg, #51D9DE, #349397, #1A5355, #041B1C, #000000);

Toward the complementary color

A gradient connecting the original color with its complementary hue.

#51D9DE #87CAFF #BFB8FF #EDA8E0 #FFA6A8

background: linear-gradient(90deg, #51D9DE, #87CAFF, #BFB8FF, #EDA8E0, #FFA6A8);

Text contrast and accessibility

Contrast determines how clearly text can be distinguished from #51D9DE. The values below compare white and black text using WCAG contrast ratios.

White text

1.70:1

AA normal Fail AA large Fail AAA normal Fail

Black text

12.33:1

AA normal Pass AA large Pass AAA normal Pass

Recommended text color: #000000 . Relative luminance: 0.5665 .

Accessible CSS

Use the recommended text color with #51D9DE as the background.

background-color: #51D9DE;
color: #000000;

Using #51D9DE in design

See how #51D9DE works in a simple interface. The examples below use the color as a background, accent and interface element, with text chosen from its accessibility result.

Background

Paletico Color in context

#51D9DE used as a full background with its recommended text color.

Accent

Accent color

Use #51D9DE to emphasize selected interface elements without filling the entire surface.

Example action

Tonal pair

#7CFAFF

#51D9DE

#003435

Colors similar to #51D9DE

These nearby colors are generated from perceptual variations of #51D9DE, including changes in lightness, chroma and hue.

#6FF4F9 #2DBFC4 #00DDE3 #80D3D6 #55DAD1 #53D7EA #64E8DE #43CADD

Color vision simulation

The simulations below show mathematical approximations of how #51D9DE may shift under three forms of color vision deficiency. They are simulations, not a diagnosis or an exact representation of any individual person's vision.

Protanopia #CAD0DF Deuteranopia #B5C0DF Tritanopia #00E0DA

Simulation based on the model by Machado, Oliveira and Fernandes (2009), published in IEEE Transactions on Visualization and Computer Graphics. DOI: 10.1109/TVCG.2009.113.

Advanced color values

Beyond RGB, CMYK and HSL, #51D9DE can also be represented in perceptual and device-independent color spaces used in color science and modern design tools.

XYZ

X: 41.3852
Y: 56.6444
Z: 77.8455

CIELAB

L*: 79.9792
a*: -34.7326
b*: -13.3544

OKLab

L: 0.814283
a: -0.110033
b: -0.037019

OKLCH

L: 0.814283
C: 0.116093
H: 198.595°