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#66758F Color

#66758F is rgb(102, 117, 143) in RGB, hsl(218, 17%, 48%) in HSL, and about cmyk(29%, 18%, 0%, 44%) 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 7.09. White text is the more readable choice on this background.

#66758F
HEX#66758F
RGBrgb(102, 117, 143)
HSLhsl(218, 17%, 48%)
HSVhsv(218, 29%, 56%)
CMYKcmyk(29%, 18%, 0%, 44%)
OKLCHoklch(56% 0.044 261.4)
LABlab(48.73% -0.99 -16.20)
LCHlch(48.73% 16.23 266.49)

What #66758F 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 #66758F, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Rhythm#777696ΔE 7.09Slate Gray#708090ΔE 7.12Shadow Blue#778BA5ΔE 8.44Dark Electric Blue#536878ΔE 8.5Light Slate Gray#778899ΔE 8.93Black Coral#54626FΔE 10.8

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

#66758F Channel Values

How #66758F 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 102 · G 117 · B 1438-bit channels as sent to the display
HSLH 218° · S 17% · L 48%Easiest model for building lighter and darker variants
HSVH 218° · S 29% · V 56%Matches the picker in most design tools
CMYKC 29% · M 18% · Y 0% · K 44%Approximate ink mix; confirm with an ICC profile before printing
Luminance4.66:1 vs white · 4.51:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #66758F 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 text4.66:1AA normal AA large AAA normal
TextBlack text4.51:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #66758F in the contrast checker.

Colors That Go With #66758F

Pairings derived from color-wheel relationships. The complementary color sits opposite #66758F; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#66758F
Complementary
#8F8066
Analogous
#668A8F
Analogous
#6B668F
Triadic
#8F6675
Triadic
#758F66
Split comp.
#8F6B66
Split comp.
#8A8F66

Tints & Shades of #66758F

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

#7987A0
#8E9AAF
#A3ACBD
#BAC2CE
#CFD4DD
#E4E7EC

Shades

#59667D
#4A5568
#3D4757
#313845
#242933
#15181E

Want a full 50-950 ramp with semantic roles? Generate design tokens from #66758F.

How #66758F 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#66758F
Protanopia#73738F
Protanomaly#6E748F
Deuteranopia#70708F
Deuteranomaly#6C728F
Tritanopia#617979
Tritanomaly#637782
Achromatopsia#747474

Test a full palette in the color blindness simulator.

Using #66758F in Code

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

CSS custom property--color-66758f: #66758F;
CSS backgroundbackground-color: #66758F;
Tailwind configcolors: { 'color-66758f': '#66758F' }
SwiftUIColor(red: 0.400, green: 0.459, blue: 0.561)
Android XML<color name="color_66758f">#66758F</color>
SVG fillfill="#66758F"

More Blue Colors

#66758F sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

000024fafaff00002ef9fafb000033f8fafc000038f8f8ff000042f5faff000047f5f5ff002147007dfa0f52ba1c39bb2a3439372aac4e3cc364609a7abdff979aaab8dbffd6d6ff

#66758F Frequently Asked Questions

What color is #66758F?

#66758F is a mid-tone blue — rgb(102, 117, 143) in RGB and hsl(218, 17%, 48%) 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 7.09.

What is the RGB value of #66758F?

#66758F is rgb(102, 117, 143) — red 102, green 117, and blue 143 on the 0-255 scale.

What is the CMYK value of #66758F?

#66758F converts to approximately cmyk(29%, 18%, 0%, 44%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #66758F be black or white?

White text is the more readable choice. #66758F scores 4.66:1 against white and 4.51:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #66758F as a CSS color keyword?

No. #66758F 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 7.12, which is clearly related but distinguishable side by side.

Open #66758F 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.