#EFE621

sRGB · 239 / 230 / 33

#EFE621 belongs to the yellow family. Its hex code tells a screen to mix 239 red, 230 green and 33 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 57.4° lands in the yellow 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 (16.01:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 239, 230, 33
HSL: 57.38°, 86.55%, 53.33%
HSV / HSB: 57.38°, 86.19%, 93.73%
CMYK (approx.): 0.00%, 3.77%, 86.19%, 6.27%
CIE XYZ (D65, Y = 100 for white): 64.166, 75.055, 12.546
CIELAB (D65, 2° observer): 89.419, -15.766, 84.441
WCAG relative luminance: 0.75054
24-bit decimal: 15722017

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 #EFE621 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 · 16.01:1

Normal text: AAA
Large text: AAA

White text · 1.31:1

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

#212AEF sits half a turn (180°) from #EFE621 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.

#EFE621 #212AEF

Analogous

#EF7F21 and #91EF21 sit 30° to either side of #EFE621. 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.

#EF7F21 #EFE621 #91EF21

Triadic

#EFE621, #21EFE6 and #E621EF are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#EFE621 #21EFE6 #E621EF

Split complementary

Start at #EFE621 and look across the wheel. #2191EF and #7F21EF sit 30° to either side of its exact opposite, giving you two different accent choices.

#EFE621 #2191EF #7F21EF

Square

Starting with #EFE621, each quarter turn (90°) takes you to the next hue: #21EF7F, #212AEF, then #EF2191. Across the square, #EFE621 pairs with #212AEF, and #21EF7F with #EF2191.

#EFE621 #21EF7F #212AEF #EF2191

Tetradic

#EFE621 and #212AEF are opposites, as are #2AEF21 and #E621EF. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#EFE621 #2AEF21 #212AEF #E621EF

Tints

Mixing #EFE621 with white in 20% steps produces this scale. The first mixture, #F2EB4D, keeps 80% of the original. By #FCFAD3, the mixture is 80% white.

#EFE621 #F2EB4D #F5F07A #F9F5A6 #FCFAD3 #FFFFFF

Shades

Mixing #EFE621 with black in 20% steps produces this scale. The first mixture, #BFB81A, keeps 80% of the original. By #302E07, the mixture is 80% black.

#EFE621 #BFB81A #8F8A14 #605C0D #302E07 #000000

Tones

Mixing #EFE621 with middle gray in 20% steps produces this scale. The first mixture, #D9D234, keeps 80% of the original. By #96946D, the mixture is 80% middle gray.

#EFE621 #D9D234 #C3BD47 #ACA95A #96946D #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

#EFE621

RGB

rgb(239 230 33)

HSL

hsl(57.379 86.555% 53.333%)

CSS example

.color-sample {
  background-color: #EFE621;
  color: #000000;
}

Channel breakdown

RGB

#EFE621 uses 239 red, 230 green and 33 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 93.7%

Green 90.2%

Blue 12.9%

CMYK

A simple CMYK estimate for #EFE621 is 0.0% cyan, 3.8% magenta, 86.2% yellow and 6.3% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 0.0%

Magenta 3.8%

Yellow 86.2%

Black 6.3%

Nearby colors

The nearest shorthand match is #EEEE22. Its matching digit pairs let you write it as #EE2 in CSS. For a modern design, keep #EFE621 when you want an exact match. Use its web-safe neighbor, #FFFF33, when matching a legacy palette of 216 colors.

Nearest shorthand · #EEEE22 Nearest web-safe · #FFFF33

Gradient to complement

#EFE621 #CDC743 #AAA766 #888888 #6669AA #4349CD #212AEF

Color vision previews

Compare how #EFE621 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.

#FBDD00

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.

#FEE437

Tritanopia

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

#FFD6C5

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.

#F7E100

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.

#F9E42E

Tritanomaly (50%)

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

#F3E17F

Grayscale (luminance)

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

#E1E1E1

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.

#E8E3A6

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 0.86316 G 0.79130 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 0.93112 G 0.90316 B 0.32435

Linear Display P3

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

R 0.85040 G 0.79368 B 0.08588

CIE xyY

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

x 0.423 y 0.495 Y 75.055

CMY

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

C % 6.275 M % 9.804 Y % 87.059

Binary RGB

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

11101111 11100110 00100001