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#66B771 Color

#66B771 is rgb(102, 183, 113) in RGB, hsl(128, 36%, 56%) in HSL, and about cmyk(44%, 0%, 38%, 28%) in CMYK. It has no registered color name of its own — the closest is Medium Sea Green (#3CB371), clearly related but distinguishable side by side at ΔE 9.97. Black text is the more readable choice on this background.

#66B771
HEX#66B771
RGBrgb(102, 183, 113)
HSLhsl(128, 36%, 56%)
HSVhsv(128, 44%, 72%)
CMYKcmyk(44%, 0%, 38%, 28%)
OKLCHoklch(71% 0.129 147.1)
LABlab(67.95% -37.21 27.61)
LCHlch(67.95% 46.33 143.42)

What #66B771 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 #66B771, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Medium Sea Green#3CB371ΔE 9.97Bud Green#7BB661ΔE 10.64Mantis#74C365ΔE 12.26Emerald#50C878ΔE 12.28Forest Green (Crayola)#5FA777ΔE 12.49Shiny Shamrock#5FA778ΔE 12.96

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

#66B771 Channel Values

How #66B771 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 183 · B 1138-bit channels as sent to the display
HSLH 128° · S 36% · L 56%Easiest model for building lighter and darker variants
HSVH 128° · S 44% · V 72%Matches the picker in most design tools
CMYKC 44% · M 0% · Y 38% · K 28%Approximate ink mix; confirm with an ICC profile before printing
Luminance2.45:1 vs white · 8.58:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #66B771 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 text2.45:1AA normal AA large AAA normal
TextBlack text8.58:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #66B771 in the contrast checker.

Colors That Go With #66B771

Pairings derived from color-wheel relationships. The complementary color sits opposite #66B771; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#66B771
Complementary
#B766AC
Analogous
#84B766
Analogous
#66B79A
Triadic
#7166B7
Triadic
#B77166
Split comp.
#9A66B7
Split comp.
#B76684

Tints & Shades of #66B771

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

#7BC185
#90CB98
#A5D5AB
#BADEBF
#CEE8D2
#E3F2E5

Shades

#50AA5C
#438E4D
#377640
#2A5A31
#1F4224
#122615

Want a full 50-950 ramp with semantic roles? Generate design tokens from #66B771.

How #66B771 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#66B771
Protanopia#ADAD71
Protanomaly#95B171
Deuteranopia#A2A274
Deuteranomaly#8EAB73
Tritanopia#73B0B0
Tritanomaly#6EB39B
Achromatopsia#A6A6A6

Test a full palette in the color blindness simulator.

Using #66B771 in Code

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

CSS custom property--color-66b771: #66B771;
CSS backgroundbackground-color: #66B771;
Tailwind configcolors: { 'color-66b771': '#66B771' }
SwiftUIColor(red: 0.400, green: 0.718, blue: 0.443)
Android XML<color name="color_66b771">#66B771</color>
SVG fillfill="#66B771"

More Green Colors

#66B771 sits in the green family. These are its neighbours across that family's full range, each with its own breakdown.

000200fdfff5001f00f7fee7002400f7fbf5002c22f5fffa002e00f5fff5003300f0fff000800000db870d542b20483f33cc6646c3995ea50072863991e0b7a3f5d8bcd7bcd1ffed

#66B771 Frequently Asked Questions

What color is #66B771?

#66B771 is a mid-tone green — rgb(102, 183, 113) in RGB and hsl(128, 36%, 56%) in HSL. It carries no registered color name of its own; the closest named color is Medium Sea Green (#3CB371), which is clearly related but distinguishable side by side at a CIE76 distance of 9.97.

What is the RGB value of #66B771?

#66B771 is rgb(102, 183, 113) — red 102, green 183, and blue 113 on the 0-255 scale.

What is the CMYK value of #66B771?

#66B771 converts to approximately cmyk(44%, 0%, 38%, 28%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #66B771 be black or white?

Black text is the more readable choice. #66B771 scores 2.45:1 against white and 8.58:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #66B771 as a CSS color keyword?

No. #66B771 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 mediumseagreen (#3CB371) at a CIE76 distance of 9.97, which is clearly related but distinguishable side by side.

Open #66B771 in a Tool

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

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