#38FF21

sRGB · 56 / 255 / 33

#38FF21 belongs to the green family. Its hex code tells a screen to mix 56 red, 255 green and 33 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 113.8° lands in the green region. Its 100.0% saturation makes it strong in color at this lightness. HSL lightness is 56.5% 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 (15.49:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 56, 255, 33
HSL: 113.78°, 100.00%, 56.47%
HSV / HSB: 113.78°, 87.06%, 100.00%
CMYK (approx.): 78.04%, 0.00%, 87.06%, 0.00%
CIE XYZ (D65, Y = 100 for white): 37.664, 72.468, 13.442
CIELAB (D65, 2° observer): 88.193, -81.854, 80.066
WCAG relative luminance: 0.72471
24-bit decimal: 3735329

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 #38FF21 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 · 15.49:1

Normal text: AAA
Large text: AAA

White text · 1.36:1

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

#E821FF sits half a turn (180°) from #38FF21 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.

#38FF21 #E821FF

Analogous

#A7FF21 and #21FF79 sit 30° to either side of #38FF21. 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.

#A7FF21 #38FF21 #21FF79

Triadic

#38FF21, #2138FF and #FF2138 are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#38FF21 #2138FF #FF2138

Split complementary

Start at #38FF21 and look across the wheel. #7921FF and #FF21A7 sit 30° to either side of its exact opposite, giving you two different accent choices.

#38FF21 #7921FF #FF21A7

Square

Starting with #38FF21, each quarter turn (90°) takes you to the next hue: #21A7FF, #E821FF, then #FF7921. Across the square, #38FF21 pairs with #E821FF, and #21A7FF with #FF7921.

#38FF21 #21A7FF #E821FF #FF7921

Tetradic

#38FF21 and #E821FF are opposites, as are #21FFE8 and #FF2138. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#38FF21 #21FFE8 #E821FF #FF2138

Tints

Mixing #38FF21 with white in 20% steps produces this scale. The first mixture, #60FF4D, keeps 80% of the original. By #D7FFD3, the mixture is 80% white.

#38FF21 #60FF4D #88FF7A #AFFFA6 #D7FFD3 #FFFFFF

Shades

Mixing #38FF21 with black in 20% steps produces this scale. The first mixture, #2DCC1A, keeps 80% of the original. By #0B3307, the mixture is 80% black.

#38FF21 #2DCC1A #229914 #16660D #0B3307 #000000

Tones

Mixing #38FF21 with middle gray in 20% steps produces this scale. The first mixture, #46E634, keeps 80% of the original. By #72996D, the mixture is 80% middle gray.

#38FF21 #46E634 #55CC47 #63B35A #72996D #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

#38FF21

RGB

rgb(56 255 33)

HSL

hsl(113.784 100.000% 56.471%)

CSS example

.color-sample {
  background-color: #38FF21;
  color: #000000;
}

Channel breakdown

RGB

#38FF21 uses 56 red, 255 green and 33 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 22.0%

Green 100.0%

Blue 12.9%

CMYK

A simple CMYK estimate for #38FF21 is 78.0% cyan, 0.0% magenta, 87.1% yellow and 0.0% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 78.0%

Magenta 0.0%

Yellow 87.1%

Black 0.0%

Nearby colors

The nearest shorthand match is #33FF22. Its matching digit pairs let you write it as #3F2 in CSS. For a modern design, keep #38FF21 when you want an exact match. Use its web-safe neighbor, #33FF33, when matching a legacy palette of 216 colors.

Nearest shorthand · #33FF22 Nearest web-safe · #33FF33

Gradient to complement

#38FF21 #55DA46 #73B56B #909090 #AD6BB5 #CB46DA #E821FF

Color vision previews

Compare how #38FF21 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.

#FFE600

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.

#F0D844

Tritanopia

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

#00F7D9

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.

#D9ED00

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.

#CFE63A

Tritanomaly (50%)

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

#49FA8C

Grayscale (luminance)

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

#DDDDDD

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.

#A6EFA4

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 0.03955 G 1.00000 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 0.49568 G 0.98585 B 0.32626

Linear Display P3

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

R 0.21006 G 0.96812 B 0.08692

CIE xyY

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

x 0.305 y 0.586 Y 72.468

CMY

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

C % 78.039 M % 0.000 Y % 87.059

Binary RGB

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

00111000 11111111 00100001