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#646E87 Color

#646E87 is rgb(100, 110, 135) in RGB, hsl(223, 15%, 46%) in HSL, and about cmyk(26%, 19%, 0%, 47%) in CMYK. It has no registered color name of its own — the closest is Rhythm (#777696), clearly related but distinguishable side by side at ΔE 7.06. White text is the more readable choice on this background.

#646E87
HEX#646E87
RGBrgb(100, 110, 135)
HSLhsl(223, 15%, 46%)
HSVhsv(223, 26%, 53%)
CMYKcmyk(26%, 19%, 0%, 47%)
OKLCHoklch(53.9% 0.041 267.9)
LABlab(46.29% 0.60 -15.18)
LCHlch(46.29% 15.19 272.25)

What #646E87 Is Called

Most hex codes have no name: there are 16.7 million of them and a few thousand registered names. These are the named colors nearest to #646E87, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Rhythm#777696ΔE 7.06Dark Electric Blue#536878ΔE 7.51Slate Gray#708090ΔE 8.71Black Coral#54626FΔE 8.94Cadet#536872ΔE 10.35Light Slate Gray#778899ΔE 11.02

Browse the full index of named colors A-Z or every blue in the library.

#646E87 Channel Values

How #646E87 breaks down in each color model. Hue is measured in degrees around the color wheel; saturation, lightness, and the CMYK inks are percentages.

ModelChannelsNotes
RGBR 100 · G 110 · B 1358-bit channels as sent to the display
HSLH 223° · S 15% · L 46%Easiest model for building lighter and darker variants
HSVH 223° · S 26% · V 53%Matches the picker in most design tools
CMYKC 26% · M 19% · Y 0% · K 47%Approximate ink mix; confirm with an ICC profile before printing
Luminance5.09:1 vs white · 4.12:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #646E87 background. AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1. Contrast is one check, not a full accessibility review.

TextWhite text5.09:1AA normal AA large AAA normal
Fails AABlack text4.12:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #646E87 in the contrast checker.

Colors That Go With #646E87

Pairings derived from color-wheel relationships. The complementary color sits opposite #646E87; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#646E87
Complementary
#877D64
Analogous
#647F87
Analogous
#6B6487
Triadic
#87646E
Triadic
#6E8764
Split comp.
#876B64
Split comp.
#7F8764

Tints & Shades of #646E87

Lighter tints and darker shades built by moving the lightness channel while holding hue and saturation, which is what you want for hover states, backgrounds, and text variants.

Tints

#757F99
#8D95AA
#A1A8BA
#B9BECB
#CDD1DA
#E5E7EB

Shades

#575F75
#4A5164
#3D4352
#303441
#23262F
#16181D

Want a full 50-950 ramp with semantic roles? Generate design tokens from #646E87.

How #646E87 Looks with Color Vision Deficiency

Simulated with the Viénot, Brettel & Mollon LMS projection model. Anomalous types are rendered as partial versions of the matching dichromacy, which is an approximation rather than a per-person clinical model.

Typical#646E87
Protanopia#6C6C87
Protanomaly#696D87
Deuteranopia#6B6B87
Deuteranomaly#686C87
Tritanopia#607272
Tritanomaly#62707B
Achromatopsia#6E6E6E

Test a full palette in the color blindness simulator.

Using #646E87 in Code

Copy-ready declarations for the places this color usually ends up.

CSS custom property--color-646e87: #646E87;
CSS backgroundbackground-color: #646E87;
Tailwind configcolors: { 'color-646e87': '#646E87' }
SwiftUIColor(red: 0.392, green: 0.431, blue: 0.529)
Android XML<color name="color_646e87">#646E87</color>
SVG fillfill="#646E87"

More Blue Colors

#646E87 sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

000024fafaff00002ef9fafb000033f8fafc000038f8f8ff000042f5faff000047f5f5ff002147007dfa0f52ba1c39bb2a3439372aac4e3cc364609a7abdff979aaab8dbffd6d6ff

#646E87 Frequently Asked Questions

What color is #646E87?

#646E87 is a mid-tone blue — rgb(100, 110, 135) in RGB and hsl(223, 15%, 46%) in HSL. It carries no registered color name of its own; the closest named color is Rhythm (#777696), which is clearly related but distinguishable side by side at a CIE76 distance of 7.06.

What is the RGB value of #646E87?

#646E87 is rgb(100, 110, 135) — red 100, green 110, and blue 135 on the 0-255 scale.

What is the CMYK value of #646E87?

#646E87 converts to approximately cmyk(26%, 19%, 0%, 47%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #646E87 be black or white?

White text is the more readable choice. #646E87 scores 5.09:1 against white and 4.12:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #646E87 as a CSS color keyword?

No. #646E87 is not one of the CSS color keywords, so it has to be written as a hex, rgb() or hsl() value. The closest keyword is slategray (#708090) at a CIE76 distance of 8.71, which is clearly related but distinguishable side by side.

Open #646E87 in a Tool

Hex to RGBHex to HSLHex to CMYKHex to OKLCHHex to PantoneBuild a paletteMake a gradient

Keep exploring: every blue in the color library, the guide to shades of blue, or the full color library.