#9BFB21

sRGB: 155 / 251 / 33

Restless currents rise against oblivion
Unbridled forces shimmer across boundless heavens
Distant echoes surrender to silence

#9BFB21 belongs to the yellow-green family. Its hex code tells a screen to mix 155 red, 251 green and 33 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 86.4° lands in the yellow-green region. Its 96.5% saturation makes it strong in color at this lightness. HSL lightness is 55.7% 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 (16.21:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 155, 251, 33
HSL: 86.42°, 96.46%, 55.69%
HSV / HSB: 86.42°, 86.85%, 98.43%
CMYK (approx.): 38.25%, 0.00%, 86.85%, 1.57%
CIE XYZ (D65, Y = 100 for white): 48.287, 76.071, 13.578
CIELAB (D65, 2° observer): 89.892, -57.465, 82.660
WCAG relative luminance: 0.76073
24-bit decimal: 10222369

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 #9BFB21 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: 16.21:1

Normal text: AAA
Large text: AAA

White text: 1.30:1

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

#8121FB sits half a turn (180°) from #9BFB21 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.

#9BFB21 #8121FB

Analogous

#FBEE21 and #2EFB21 sit 30° to either side of #9BFB21. 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.

#FBEE21 #9BFB21 #2EFB21

Triadic

#9BFB21, #219BFB and #FB219B are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#9BFB21 #219BFB #FB219B

Split complementary

Start at #9BFB21 and look across the wheel. #212EFB and #EE21FB sit 30° to either side of its exact opposite, giving you two different accent choices.

#9BFB21 #212EFB #EE21FB

Square

Starting with #9BFB21, each quarter turn (90°) takes you to the next hue: #21FBEE, #8121FB, then #FB212E. Across the square, #9BFB21 pairs with #8121FB, and #21FBEE with #FB212E.

#9BFB21 #21FBEE #8121FB #FB212E

Tetradic

#9BFB21 and #8121FB are opposites, as are #21FB81 and #FB219B. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#9BFB21 #21FB81 #8121FB #FB219B

Tints

Mixing #9BFB21 with white in 20% steps produces this scale. The first mixture, #AFFC4D, keeps 80% of the original. By #EBFED3, the mixture is 80% white.

#9BFB21 #AFFC4D #C3FD7A #D7FDA6 #EBFED3 #FFFFFF

Shades

Mixing #9BFB21 with black in 20% steps produces this scale. The first mixture, #7CC91A, keeps 80% of the original. By #1F3207, the mixture is 80% black.

#9BFB21 #7CC91A #5D9714 #3E640D #1F3207 #000000

Tones

Mixing #9BFB21 with middle gray in 20% steps produces this scale. The first mixture, #96E234, keeps 80% of the original. By #85996D, the mixture is 80% middle gray.

#9BFB21 #96E234 #90CA47 #8BB15A #85996D #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

#9BFB21

RGB

rgb(155 251 33)

HSL

hsl(86.422 96.460% 55.686%)

CSS example

.color-sample {
  background-color: #9BFB21;
  color: #000000;
}

Channel breakdown

RGB

#9BFB21 uses 155 red, 251 green and 33 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 60.8%

Green 98.4%

Blue 12.9%

CMYK

A simple CMYK estimate for #9BFB21 is 38.2% cyan, 0.0% magenta, 86.9% yellow and 1.6% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 38.2%

Magenta 0.0%

Yellow 86.9%

Black 1.6%

Nearby colors

The nearest shorthand match is #99FF22. Its matching digit pairs let you write it as #9F2 in CSS. For a modern design, keep #9BFB21 when you want an exact match. Use its web-safe neighbor, #99FF33, when matching a legacy palette of 216 colors.

Nearest shorthand: #99FF22 Nearest web-safe: #99FF33

Gradient to complement

#9BFB21 #97D745 #92B26A #8E8E8E #8A6AB2 #8545D7 #8121FB

Color vision previews

Compare how #9BFB21 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.

#FFE700

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.

#F9DF41

Tritanopia

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

#9CF0D6

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.

#E8ED00

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.

#E2E937

Tritanomaly (50%)

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

#A1F68A

Grayscale (luminance)

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

#E2E2E2

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.

#C3EFA7

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 0.32778 G 0.96469 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 0.69497 G 0.97476 B 0.33055

Linear Display P3

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

R 0.44085 G 0.94354 B 0.08929

CIE xyY

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

x 0.350 y 0.551 Y 76.071

CMY

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

C % 39.216 M % 1.569 Y % 87.059

Binary RGB

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

10011011 11111011 00100001