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#66B8E1 Color

#66B8E1 is rgb(102, 184, 225) in RGB, hsl(200, 67%, 64%) in HSL, and about cmyk(55%, 18%, 0%, 12%) in CMYK. It has no registered color name of its own — the closest is Blizzard Blue (#50BFE6), clearly related but distinguishable side by side at ΔE 6.67. Black text is the more readable choice on this background.

#66B8E1
HEX#66B8E1
RGBrgb(102, 184, 225)
HSLhsl(200, 67%, 64%)
HSVhsv(200, 55%, 88%)
CMYKcmyk(55%, 18%, 0%, 12%)
OKLCHoklch(74.6% 0.1 232)
LABlab(70.79% -17.34 -28.81)
LCHlch(70.79% 33.62 238.96)

What #66B8E1 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 #66B8E1, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Blizzard Blue#50BFE6ΔE 6.67Aero#7CB9E8ΔE 6.73Maximum Blue#47ABCCΔE 8.09Light Sky Blue#87CEFAΔE 8.99Picton Blue#45B1E8ΔE 9.05Maya Blue#73C2FBΔE 9.49

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

#66B8E1 Channel Values

How #66B8E1 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 184 · B 2258-bit channels as sent to the display
HSLH 200° · S 67% · L 64%Easiest model for building lighter and darker variants
HSVH 200° · S 55% · V 88%Matches the picker in most design tools
CMYKC 55% · M 18% · Y 0% · K 12%Approximate ink mix; confirm with an ICC profile before printing
Luminance2.21:1 vs white · 9.51:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #66B8E1 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.

Fails AAWhite text2.21:1AA normal AA large AAA normal
TextBlack text9.51:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #66B8E1 in the contrast checker.

Colors That Go With #66B8E1

Pairings derived from color-wheel relationships. The complementary color sits opposite #66B8E1; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#66B8E1
Complementary
#E18F66
Analogous
#66E1CC
Analogous
#667AE1
Triadic
#E166B8
Triadic
#B8E166
Split comp.
#E1667A
Split comp.
#E1CC66

Tints & Shades of #66B8E1

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

#7BC2E5
#90CCE9
#A6D5ED
#B7DDF1
#CCE7F5
#E1F1F9

Shades

#3FA6D9
#2893C8
#2077A2
#195E80
#124259
#0B2937

Want a full 50-950 ramp with semantic roles? Generate design tokens from #66B8E1.

How #66B8E1 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#66B8E1
Protanopia#ADADE1
Protanomaly#96B2E1
Deuteranopia#A3A3E2
Deuteranomaly#8EACE2
Tritanopia#58BEBE
Tritanomaly#5EBCCD
Achromatopsia#AEAEAE

Test a full palette in the color blindness simulator.

Using #66B8E1 in Code

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

CSS custom property--color-66b8e1: #66B8E1;
CSS backgroundbackground-color: #66B8E1;
Tailwind configcolors: { 'color-66b8e1': '#66B8E1' }
SwiftUIColor(red: 0.400, green: 0.722, blue: 0.882)
Android XML<color name="color_66b8e1">#66B8E1</color>
SVG fillfill="#66B8E1"

More Blue Colors

#66B8E1 sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

000024fafaff00002ef9fafb000033f8fafc000038f8f8ff000042f5faff000047f5f5ff002147007dfa0f52ba1c39bb2a3439372aac4e3cc364609a7abdff979aaab8dbffd6d6ff

#66B8E1 Frequently Asked Questions

What color is #66B8E1?

#66B8E1 is a light blue — rgb(102, 184, 225) in RGB and hsl(200, 67%, 64%) in HSL. It carries no registered color name of its own; the closest named color is Blizzard Blue (#50BFE6), which is clearly related but distinguishable side by side at a CIE76 distance of 6.67.

What is the RGB value of #66B8E1?

#66B8E1 is rgb(102, 184, 225) — red 102, green 184, and blue 225 on the 0-255 scale.

What is the CMYK value of #66B8E1?

#66B8E1 converts to approximately cmyk(55%, 18%, 0%, 12%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #66B8E1 be black or white?

Black text is the more readable choice. #66B8E1 scores 2.21:1 against white and 9.51:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #66B8E1 as a CSS color keyword?

No. #66B8E1 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 lightskyblue (#87CEFA) at a CIE76 distance of 8.99, which is clearly related but distinguishable side by side.

Open #66B8E1 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.