#11FFFF

sRGB: 17 / 255 / 255
Color name: Looney Blue

Fading shadows dissolve into silence
Unbridled forces transform the fabric of existence
Celestial symphonies echo beyond eternity

The hex code for Looney Blue is #11FFFF. It belongs to the cyan family. Its hex code tells a screen to mix 17 red, 255 green and 255 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 180.0° lands in the cyan region. Its 100.0% saturation makes it strong in color at this lightness. HSL lightness is 53.3% on a scale from black (0%) to white (100%). Of black and white lettering, black has the clearer light-to-dark separation on this background (16.77:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 17, 255, 255
HSL: 180.00°, 100.00%, 53.33%
HSV / HSB: 180.00°, 93.33%, 100.00%
CMYK (approx.): 93.33%, 0.00%, 0.00%, 0.00%
CIE XYZ (D65, Y = 100 for white): 54.038, 78.855, 106.984
CIELAB (D65, 2° observer): 91.169, -47.720, -14.043
WCAG relative luminance: 0.78859
24-bit decimal: 1179647

CMYK uses a profile-free approximation. Printed output depends on the press, ink and paper. Lab uses a D65 white point.

Text contrast

Contrast tells you how clearly lettering separates from #11FFFF in light and dark. The ratio compares relative luminance, a measure of light weighted for human vision. Identical colors give 1:1 and black against white gives 21:1. A ratio of 2.99:1 falls just below the 3:1 AA minimum for large text. Body text needs at least 4.5:1 because its finer strokes are harder to distinguish.

Black text: 16.77:1

Normal text: AAA
Large text: AAA

White text: 1.25:1

Normal text: Fail
Large text: Fail

AA and AAA are WCAG accessibility levels. AAA sets a higher bar: 7:1 for normal text and 4.5:1 for large text. Large text begins at 18 pt regular or 14 pt bold. Ratings use the unrounded ratio.

Reference: WCAG text contrast guidance

Palettes & scales

Harmonies rotate the hue. Scales mix the starting color with white, black or middle gray in 20% steps in encoded sRGB.

Complementary

#FF1111 sits half a turn (180°) from #11FFFF on the HSL wheel. Keeping saturation and lightness steady while crossing to the opposite hue gives you a contrasting accent. Check text contrast separately before using the pair for lettering.

#11FFFF #FF1111

Analogous

#11FF88 and #1188FF sit 30° to either side of #11FFFF. The three hues are neighbors on the wheel, so you can change the color of a border or highlight while keeping it close to the original.

#11FF88 #11FFFF #1188FF

Triadic

#11FFFF, #FF11FF and #FFFF11 are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#11FFFF #FF11FF #FFFF11

Split complementary

Start at #11FFFF and look across the wheel. #FF1188 and #FF8811 sit 30° to either side of its exact opposite, giving you two different accent choices.

#11FFFF #FF1188 #FF8811

Square

Starting with #11FFFF, each quarter turn (90°) takes you to the next hue: #8811FF, #FF1111, then #88FF11. Across the square, #11FFFF pairs with #FF1111, and #8811FF with #88FF11.

#11FFFF #8811FF #FF1111 #88FF11

Tetradic

#11FFFF and #FF1111 are opposites, as are #1111FF and #FFFF11. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#11FFFF #1111FF #FF1111 #FFFF11

Tints

Mixing #11FFFF with white in 20% steps produces this scale. The first mixture, #41FFFF, keeps 80% of the original. By #CFFFFF, the mixture is 80% white.

#11FFFF #41FFFF #70FFFF #A0FFFF #CFFFFF #FFFFFF

Shades

Mixing #11FFFF with black in 20% steps produces this scale. The first mixture, #0ECCCC, keeps 80% of the original. By #033333, the mixture is 80% black.

#11FFFF #0ECCCC #0A9999 #076666 #033333 #000000

Tones

Mixing #11FFFF with middle gray in 20% steps produces this scale. The first mixture, #27E6E6, keeps 80% of the original. By #6A9999, the mixture is 80% middle gray.

#11FFFF #27E6E6 #3DCCCC #54B3B3 #6A9999 #808080

Copy color codes

Hex, RGB and HSL are three ways to write this screen color. Paste any of them into a CSS color property.

Hex

#11FFFF

RGB

rgb(17 255 255)

HSL

hsl(180.000 100.000% 53.333%)

CSS example

.color-sample {
  background-color: #11FFFF;
  color: #000000;
}

Channel breakdown

RGB

#11FFFF uses 17 red, 255 green and 255 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 6.7%

Green 100.0%

Blue 100.0%

CMYK

A simple CMYK estimate for #11FFFF is 93.3% cyan, 0.0% magenta, 0.0% yellow and 0.0% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 93.3%

Magenta 0.0%

Yellow 0.0%

Black 0.0%

Nearby colors

The nearest shorthand match is #11FFFF. Its matching digit pairs let you write it as #1FF in CSS. For a modern design, keep #11FFFF when you want an exact match. Use its web-safe neighbor, #00FFFF, when matching a legacy palette of 216 colors.

Nearest shorthand: #11FFFF Nearest web-safe: #00FFFF

Gradient to complement

#11FFFF #39D7D7 #60B0B0 #888888 #B06060 #D73939 #FF1111

Color vision previews

Compare how #11FFFF appears in each simulation. When two chart lines or status indicators become hard to tell apart, a label, shape or line pattern gives readers another way to distinguish them. Individual perception varies.

Protanopia

A red–green color vision deficiency. Without a distinct response from long-wavelength cones, some reds and greens can look alike, and reds can appear darker.

#EDF2FF

Deuteranopia

A red–green color vision deficiency. Without a distinct response from medium-wavelength cones, some greens can be difficult to distinguish from reds or browns.

#D1DDFF

Tritanopia

A blue–yellow color vision deficiency. Without a distinct response from short-wavelength cones, blue can resemble green, and yellow can resemble pink.

#00FFFE

Protanomaly (50%)

An altered long-wavelength cone response can make reds appear dimmer and harder to distinguish from greens. This swatch shows the model’s halfway setting.

#C3F4FF

Deuteranomaly (50%)

An altered medium-wavelength cone response can reduce the visible difference between reds and greens. This swatch shows the model’s halfway setting.

#B4EAFF

Tritanomaly (50%)

An altered short-wavelength cone response can make blue harder to distinguish from green. This swatch shows the model’s halfway setting.

#00FFFE

Grayscale (luminance)

This design check removes hue and preserves relative luminance so you can compare light and dark areas.

#E6E6E6

Partial grayscale (50% blend)

This design check mixes the original color halfway toward its grayscale equivalent in linear light. Use it to see how a design holds up as color fades.

#A9F3F3

Reference: National Eye Institute: Types of Color Vision Deficiency

Technical reference

CAM16 and CIECAM02 below assume D65 white, an average surround, background Y of 20 against white at 100, and adapting luminance of 4.07 cd/m².

Linear sRGB

These channels scale with emitted light. Use them for lighting calculations and physically meaningful blends.

R 0.00561 G 1.00000 B 1.00000

Display P3

P3 displays can reproduce a wider range of reds and greens. These coordinates reproduce this same sRGB swatch on a color-managed P3 display.

R 0.46391 G 0.98535 B 0.99250

Linear Display P3

These P3 channels are proportional to light, before display encoding.

R 0.18215 G 0.96699 B 0.98301

CIE xyY

The x and y coordinates locate chromaticity on a diagram. Y gives relative luminance on a scale where white is 100.

x 0.225 y 0.329 Y 78.855

CMY

Ideal cyan, magenta and yellow are the complements of the encoded red, green and blue channels.

C % 93.333 M % 0.000 Y % 0.000

Binary RGB

Each eight-bit group represents one channel. Together they store the 24-bit hex color.

00010001 11111111 11111111