#80EF21

sRGB: 128 / 239 / 33

#80EF21 belongs to the yellow-green family. Its hex code tells a screen to mix 128 red, 239 green and 33 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 92.3° lands in the yellow-green region. Its 86.6% 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 (14.29:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 128, 239, 33
HSL: 92.33°, 86.55%, 53.33%
HSV / HSB: 92.33°, 86.19%, 93.73%
CMYK (approx.): 46.44%, 0.00%, 86.19%, 6.27%
CIE XYZ (D65, Y = 100 for white): 40.042, 66.430, 12.151
CIELAB (D65, 2° observer): 85.215, -61.447, 78.225
WCAG relative luminance: 0.66432
24-bit decimal: 8449825

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 #80EF21 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: 14.29:1

Normal text: AAA
Large text: AAA

White text: 1.47:1

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

#9021EF sits half a turn (180°) from #80EF21 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.

#80EF21 #9021EF

Analogous

#E7EF21 and #21EF29 sit 30° to either side of #80EF21. 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.

#E7EF21 #80EF21 #21EF29

Triadic

#80EF21, #2180EF and #EF2180 are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#80EF21 #2180EF #EF2180

Split complementary

Start at #80EF21 and look across the wheel. #2921EF and #EF21E7 sit 30° to either side of its exact opposite, giving you two different accent choices.

#80EF21 #2921EF #EF21E7

Square

Starting with #80EF21, each quarter turn (90°) takes you to the next hue: #21E7EF, #9021EF, then #EF2921. Across the square, #80EF21 pairs with #9021EF, and #21E7EF with #EF2921.

#80EF21 #21E7EF #9021EF #EF2921

Tetradic

#80EF21 and #9021EF are opposites, as are #21EF90 and #EF2180. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#80EF21 #21EF90 #9021EF #EF2180

Tints

Mixing #80EF21 with white in 20% steps produces this scale. The first mixture, #99F24D, keeps 80% of the original. By #E6FCD3, the mixture is 80% white.

#80EF21 #99F24D #B3F57A #CCF9A6 #E6FCD3 #FFFFFF

Shades

Mixing #80EF21 with black in 20% steps produces this scale. The first mixture, #66BF1A, keeps 80% of the original. By #1A3007, the mixture is 80% black.

#80EF21 #66BF1A #4D8F14 #33600D #1A3007 #000000

Tones

Mixing #80EF21 with middle gray in 20% steps produces this scale. The first mixture, #80D934, keeps 80% of the original. By #80966D, the mixture is 80% middle gray.

#80EF21 #80D934 #80C347 #80AC5A #80966D #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

#80EF21

RGB

rgb(128 239 33)

HSL

hsl(92.330 86.555% 53.333%)

CSS example

.color-sample {
  background-color: #80EF21;
  color: #000000;
}

Channel breakdown

RGB

#80EF21 uses 128 red, 239 green and 33 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 50.2%

Green 93.7%

Blue 12.9%

CMYK

A simple CMYK estimate for #80EF21 is 46.4% cyan, 0.0% magenta, 86.2% yellow and 6.3% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 46.4%

Magenta 0.0%

Yellow 86.2%

Black 6.3%

Nearby colors

The nearest shorthand match is #88EE22. Its matching digit pairs let you write it as #8E2 in CSS. For a modern design, keep #80EF21 when you want an exact match. Use its web-safe neighbor, #99FF33, when matching a legacy palette of 216 colors.

Nearest shorthand: #88EE22 Nearest web-safe: #99FF33

Gradient to complement

#80EF21 #83CD43 #85AA66 #888888 #8B66AA #8D43CD #9021EF

Color vision previews

Compare how #80EF21 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.

#F8DB00

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.

#E9D23F

Tritanopia

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

#7CE6CC

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.

#D8E100

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.

#D1DC36

Tritanomaly (50%)

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

#87EA83

Grayscale (luminance)

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

#D5D5D5

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.

#B1E29E

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 0.21586 G 0.86316 B 0.01521

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 0.61037 G 0.92689 B 0.31335

Linear Display P3

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

R 0.33078 G 0.84167 B 0.08003

CIE xyY

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

x 0.338 y 0.560 Y 66.430

CMY

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

C % 49.804 M % 6.275 Y % 87.059

Binary RGB

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

10000000 11101111 00100001