#91BBBF

sRGB: 145 / 187 / 191

Restless currents dissolve into silence
Restless constellations shimmer across boundless heavens
Eternal flames echo beyond eternity

#91BBBF belongs to the cyan family. Its hex code tells a screen to mix 145 red, 187 green and 191 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 185.2° lands in the cyan region. Its 26.4% saturation makes it close to gray at this lightness. HSL lightness is 65.9% 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 (10.06:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 145, 187, 191
HSL: 185.22°, 26.44%, 65.88%
HSV / HSB: 185.22°, 24.08%, 74.90%
CMYK (approx.): 24.08%, 2.09%, 0.00%, 25.10%
CIE XYZ (D65, Y = 100 for white): 38.849, 45.321, 55.993
CIELAB (D65, 2° observer): 73.103, -12.996, -6.597
WCAG relative luminance: 0.45322
24-bit decimal: 9550783

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 #91BBBF 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: 10.06:1

Normal text: AAA
Large text: AAA

White text: 2.09:1

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

#BF9591 sits half a turn (180°) from #91BBBF 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.

#91BBBF #BF9591

Analogous

#91BFAC and #91A4BF sit 30° to either side of #91BBBF. 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.

#91BFAC #91BBBF #91A4BF

Triadic

#91BBBF, #BF91BB and #BBBF91 are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#91BBBF #BF91BB #BBBF91

Split complementary

Start at #91BBBF and look across the wheel. #BF91A4 and #BFAC91 sit 30° to either side of its exact opposite, giving you two different accent choices.

#91BBBF #BF91A4 #BFAC91

Square

Starting with #91BBBF, each quarter turn (90°) takes you to the next hue: #AC91BF, #BF9591, then #A4BF91. Across the square, #91BBBF pairs with #BF9591, and #AC91BF with #A4BF91.

#91BBBF #AC91BF #BF9591 #A4BF91

Tetradic

#91BBBF and #BF9591 are opposites, as are #9591BF and #BBBF91. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#91BBBF #9591BF #BF9591 #BBBF91

Tints

Mixing #91BBBF with white in 20% steps produces this scale. The first mixture, #A7C9CC, keeps 80% of the original. By #E9F1F2, the mixture is 80% white.

#91BBBF #A7C9CC #BDD6D9 #D3E4E5 #E9F1F2 #FFFFFF

Shades

Mixing #91BBBF with black in 20% steps produces this scale. The first mixture, #749699, keeps 80% of the original. By #1D2526, the mixture is 80% black.

#91BBBF #749699 #577073 #3A4B4C #1D2526 #000000

Tones

Mixing #91BBBF with middle gray in 20% steps produces this scale. The first mixture, #8EAFB2, keeps 80% of the original. By #838C8D, the mixture is 80% middle gray.

#91BBBF #8EAFB2 #8AA3A6 #879899 #838C8D #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

#91BBBF

RGB

rgb(145 187 191)

HSL

hsl(185.217 26.437% 65.882%)

CSS example

.color-sample {
  background-color: #91BBBF;
  color: #000000;
}

Channel breakdown

RGB

#91BBBF uses 145 red, 187 green and 191 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 56.9%

Green 73.3%

Blue 74.9%

CMYK

A simple CMYK estimate for #91BBBF is 24.1% cyan, 2.1% magenta, 0.0% yellow and 25.1% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 24.1%

Magenta 2.1%

Yellow 0.0%

Black 25.1%

Nearby colors

The nearest shorthand match is #99BBBB. Its matching digit pairs let you write it as #9BB in CSS. For a modern design, keep #91BBBF when you want an exact match. Use its web-safe neighbor, #99CCCC, when matching a legacy palette of 216 colors.

Nearest shorthand: #99BBBB Nearest web-safe: #99CCCC

Gradient to complement

#91BBBF #99B5B7 #A0AEB0 #A8A8A8 #B0A2A0 #B79B99 #BF9591

Color vision previews

Compare how #91BBBF 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.

#B5B7BF

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.

#ACB1BF

Tritanopia

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

#82BEBC

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.

#A9B8BF

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.

#A5B4BF

Tritanomaly (50%)

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

#90BBBE

Grayscale (luminance)

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

#B3B3B3

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.

#A3B7B9

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 0.28315 G 0.49693 B 0.52100

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 0.60219 G 0.72862 B 0.74527

Linear Display P3

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

R 0.32110 G 0.48984 B 0.51519

CIE xyY

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

x 0.277 y 0.323 Y 45.321

CMY

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

C % 43.137 M % 26.667 Y % 25.098

Binary RGB

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

10010001 10111011 10111111