#577FCB

sRGB · 87 / 127 / 203

#577FCB belongs to the azure family. Its hex code tells a screen to mix 87 red, 127 green and 203 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 219.3° lands in the azure region. Its 52.7% saturation makes it partway between gray and the most vivid version of this hue at this lightness. HSL lightness is 56.9% 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 (5.30:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 87, 127, 203
HSL: 219.31°, 52.73%, 56.86%
HSV / HSB: 219.31°, 57.14%, 79.61%
CMYK (approx.): 57.14%, 37.44%, 0.00%, 20.39%
CIE XYZ (D65, Y = 100 for white): 22.298, 21.516, 59.480
CIELAB (D65, 2° observer): 53.510, 8.765, -43.638
WCAG relative luminance: 0.21517
24-bit decimal: 5734347

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 #577FCB 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 · 5.30:1

Normal text: AA
Large text: AAA

White text · 3.96:1

Normal text: Fail
Large text: AA

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

#CBA357 sits half a turn (180°) from #577FCB 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.

#577FCB #CBA357

Analogous

#57B9CB and #6957CB sit 30° to either side of #577FCB. 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.

#57B9CB #577FCB #6957CB

Triadic

#577FCB, #CB577F and #7FCB57 are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#577FCB #CB577F #7FCB57

Split complementary

Start at #577FCB and look across the wheel. #CB6957 and #B9CB57 sit 30° to either side of its exact opposite, giving you two different accent choices.

#577FCB #CB6957 #B9CB57

Square

Starting with #577FCB, each quarter turn (90°) takes you to the next hue: #CB57B9, #CBA357, then #57CB69. Across the square, #577FCB pairs with #CBA357, and #CB57B9 with #57CB69.

#577FCB #CB57B9 #CBA357 #57CB69

Tetradic

#577FCB and #CBA357 are opposites, as are #A357CB and #7FCB57. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#577FCB #A357CB #CBA357 #7FCB57

Tints

Mixing #577FCB with white in 20% steps produces this scale. The first mixture, #7999D5, keeps 80% of the original. By #DDE5F5, the mixture is 80% white.

#577FCB #7999D5 #9AB2E0 #BCCCEA #DDE5F5 #FFFFFF

Shades

Mixing #577FCB with black in 20% steps produces this scale. The first mixture, #4666A2, keeps 80% of the original. By #111929, the mixture is 80% black.

#577FCB #4666A2 #344C7A #233351 #111929 #000000

Tones

Mixing #577FCB with middle gray in 20% steps produces this scale. The first mixture, #5F7FBC, keeps 80% of the original. By #78808F, the mixture is 80% middle gray.

#577FCB #5F7FBC #677FAD #70809E #78808F #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

#577FCB

RGB

rgb(87 127 203)

HSL

hsl(219.310 52.727% 56.863%)

CSS example

.color-sample {
  background-color: #577FCB;
  color: #000000;
}

Channel breakdown

RGB

#577FCB uses 87 red, 127 green and 203 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 34.1%

Green 49.8%

Blue 79.6%

CMYK

A simple CMYK estimate for #577FCB is 57.1% cyan, 37.4% magenta, 0.0% yellow and 20.4% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 57.1%

Magenta 37.4%

Yellow 0.0%

Black 20.4%

Nearby colors

The nearest shorthand match is #5577CC. Its matching digit pairs let you write it as #57C in CSS. For a modern design, keep #577FCB when you want an exact match. Use its web-safe neighbor, #6666CC, when matching a legacy palette of 216 colors.

Nearest shorthand · #5577CC Nearest web-safe · #6666CC

Gradient to complement

#577FCB #6A85B8 #7E8BA4 #919191 #A4977E #B89D6A #CBA357

Color vision previews

Compare how #577FCB 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.

#5F86CE

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.

#517BC9

Tritanopia

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

#00909B

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.

#5B82CD

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.

#547DCA

Tritanomaly (50%)

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

#4E84BB

Grayscale (luminance)

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

#808080

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.

#6E7FAB

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 0.09531 G 0.21223 B 0.59720

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 0.37508 G 0.49380 B 0.77404

Linear Display P3

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

R 0.11607 G 0.20835 B 0.56076

CIE xyY

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

x 0.216 y 0.208 Y 21.516

CMY

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

C % 65.882 M % 50.196 Y % 20.392

Binary RGB

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

01010111 01111111 11001011