#63D310

sRGB · 99 / 211 / 16

#63D310 belongs to the yellow-green family. Its hex code tells a screen to mix 99 red, 211 green and 16 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 94.5° lands in the yellow-green region. Its 85.9% saturation makes it strong in color at this lightness. HSL lightness is 44.5% 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 (10.86:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 99, 211, 16
HSL: 94.46°, 85.90%, 44.51%
HSV / HSB: 94.46°, 92.42%, 82.75%
CMYK (approx.): 53.08%, 0.00%, 92.42%, 17.25%
CIE XYZ (D65, Y = 100 for white): 28.532, 49.277, 8.498
CIELAB (D65, 2° observer): 75.623, -60.139, 72.506
WCAG relative luminance: 0.49279
24-bit decimal: 6542096

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 #63D310 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 · 10.86:1

Normal text: AAA
Large text: AAA

White text · 1.93:1

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. 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

#8010D3 sits half a turn (180°) from #63D310 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.

#63D310 #8010D3

Analogous

#C5D310 and #10D31E sit 30° to either side of #63D310. 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.

#C5D310 #63D310 #10D31E

Triadic

#63D310, #1063D3 and #D31063 are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#63D310 #1063D3 #D31063

Split complementary

Start at #63D310 and look across the wheel. #1E10D3 and #D310C5 sit 30° to either side of its exact opposite, giving you two different accent choices.

#63D310 #1E10D3 #D310C5

Square

Starting with #63D310, each quarter turn (90°) takes you to the next hue: #10C5D3, #8010D3, then #D31E10. Across the square, #63D310 pairs with #8010D3, and #10C5D3 with #D31E10.

#63D310 #10C5D3 #8010D3 #D31E10

Tetradic

#63D310 and #8010D3 are opposites, as are #10D380 and #D31063. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#63D310 #10D380 #8010D3 #D31063

Tints

Mixing #63D310 with white in 20% steps produces this scale. The first mixture, #82DC40, keeps 80% of the original. By #E0F6CF, the mixture is 80% white.

#63D310 #82DC40 #A1E570 #C1ED9F #E0F6CF #FFFFFF

Shades

Mixing #63D310 with black in 20% steps produces this scale. The first mixture, #4FA90D, keeps 80% of the original. By #142A03, the mixture is 80% black.

#63D310 #4FA90D #3B7F0A #285406 #142A03 #000000

Tones

Mixing #63D310 with middle gray in 20% steps produces this scale. The first mixture, #69C226, keeps 80% of the original. By #7A916A, the mixture is 80% middle gray.

#63D310 #69C226 #6FB23D #74A153 #7A916A #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

#63D310

RGB

rgb(99 211 16)

HSL

hsl(94.462 85.903% 44.510%)

CSS example

.color-sample {
  background-color: #63D310;
  color: #000000;
}

Channel breakdown

RGB

#63D310 uses 99 red, 211 green and 16 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 38.8%

Green 82.7%

Blue 6.3%

CMYK

A simple CMYK estimate for #63D310 is 53.1% cyan, 0.0% magenta, 92.4% yellow and 17.3% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 53.1%

Magenta 0.0%

Yellow 92.4%

Black 17.3%

Nearby colors

The nearest shorthand match is #66CC11. Its matching digit pairs let you write it as #6C1 in CSS. For a modern design, keep #63D310 when you want an exact match. Use its web-safe neighbor, #66CC00, when matching a legacy palette of 216 colors.

Nearest shorthand · #66CC11 Nearest web-safe · #66CC00

Gradient to complement

#63D310 #68B331 #6D9251 #727272 #765192 #7B31B3 #8010D3

Color vision previews

Compare how #63D310 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.

#DAC000

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.

#CCB732

Tritanopia

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

#5BCBB3

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.

#BBC600

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.

#B5C128

Tritanomaly (50%)

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

#6ACF71

Grayscale (luminance)

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

#BABABA

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.

#97C789

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 0.12477 G 0.65141 B 0.00518

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 0.50454 G 0.81751 B 0.25769

Linear Display P3

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

R 0.21827 G 0.63392 B 0.05401

CIE xyY

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

x 0.331 y 0.571 Y 49.277

CMY

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

C % 61.176 M % 17.255 Y % 93.725

Binary RGB

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

01100011 11010011 00010000