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#646B7D Color

#646B7D is rgb(100, 107, 125) in RGB, hsl(223, 11%, 44%) in HSL, and about cmyk(20%, 14%, 0%, 51%) in CMYK. It has no registered color name of its own — the closest is Black Coral (#54626F), clearly related but distinguishable side by side at ΔE 5.87. White text is the more readable choice on this background.

#646B7D
HEX#646B7D
RGBrgb(100, 107, 125)
HSLhsl(223, 11%, 44%)
HSVhsv(223, 20%, 49%)
CMYKcmyk(20%, 14%, 0%, 51%)
OKLCHoklch(52.8% 0.03 268.6)
LABlab(45.11% 0.36 -11.00)
LCHlch(45.11% 11.01 271.86)

What #646B7D 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 #646B7D, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Black Coral#54626FΔE 5.87Dark Electric Blue#536878ΔE 5.93Cadet#536872ΔE 7.55Slate Gray#708090ΔE 8.42Steel#71797EΔE 9.23Rhythm#777696ΔE 9.95

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

#646B7D Channel Values

How #646B7D 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 107 · B 1258-bit channels as sent to the display
HSLH 223° · S 11% · L 44%Easiest model for building lighter and darker variants
HSVH 223° · S 20% · V 49%Matches the picker in most design tools
CMYKC 20% · M 14% · Y 0% · K 51%Approximate ink mix; confirm with an ICC profile before printing
Luminance5.33:1 vs white · 3.94:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #646B7D 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 text5.33:1AA normal AA large AAA normal
Fails AABlack text3.94:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #646B7D in the contrast checker.

Colors That Go With #646B7D

Pairings derived from color-wheel relationships. The complementary color sits opposite #646B7D; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#646B7D
Complementary
#7D7664
Analogous
#64777D
Analogous
#69647D
Triadic
#7D646B
Triadic
#6B7D64
Split comp.
#7D6964
Split comp.
#777D64

Tints & Shades of #646B7D

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

#777F92
#8B91A2
#A2A7B4
#B8BCC6
#CFD2D8
#E3E4E8

Shades

#565C6C
#4B505D
#3D424C
#30333B
#22242A
#17181C

Want a full 50-950 ramp with semantic roles? Generate design tokens from #646B7D.

How #646B7D 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#646B7D
Protanopia#6A6A7D
Protanomaly#686A7D
Deuteranopia#69697D
Deuteranomaly#676A7D
Tritanopia#616D6D
Tritanomaly#626C74
Achromatopsia#6B6B6B

Test a full palette in the color blindness simulator.

Using #646B7D in Code

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

CSS custom property--color-646b7d: #646B7D;
CSS backgroundbackground-color: #646B7D;
Tailwind configcolors: { 'color-646b7d': '#646B7D' }
SwiftUIColor(red: 0.392, green: 0.420, blue: 0.490)
Android XML<color name="color_646b7d">#646B7D</color>
SVG fillfill="#646B7D"

More Blue Colors

#646B7D sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

000024fafaff00002ef9fafb000033f8fafc000038f8f8ff000042f5faff000047f5f5ff002147007dfa0f52ba1c39bb2a3439372aac4e3cc364609a7abdff979aaab8dbffd6d6ff

#646B7D Frequently Asked Questions

What color is #646B7D?

#646B7D is a mid-tone blue — rgb(100, 107, 125) in RGB and hsl(223, 11%, 44%) in HSL. It carries no registered color name of its own; the closest named color is Black Coral (#54626F), which is clearly related but distinguishable side by side at a CIE76 distance of 5.87.

What is the RGB value of #646B7D?

#646B7D is rgb(100, 107, 125) — red 100, green 107, and blue 125 on the 0-255 scale.

What is the CMYK value of #646B7D?

#646B7D converts to approximately cmyk(20%, 14%, 0%, 51%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #646B7D be black or white?

White text is the more readable choice. #646B7D scores 5.33:1 against white and 3.94:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #646B7D as a CSS color keyword?

No. #646B7D 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 8.42, which is clearly related but distinguishable side by side.

Open #646B7D 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.