#EFFF0A Color

#EFFF0A is rgb(239, 255, 10) in RGB, hsl(64, 100%, 52%) in HSL, and about cmyk(6%, 0%, 96%, 0%) in CMYK. It has no registered color name of its own — the closest is Watermelon Yellow (#EEFF1B), below the threshold most people can see at ΔE 1.79. Black text is the more readable choice on this background.

#EFFF0A

HEX#EFFF0A

RGBrgb(239, 255, 10)

HSLhsl(64, 100%, 52%)

HSVhsv(64, 96%, 100%)

CMYKcmyk(6%, 0%, 96%, 0%)

OKLCHoklch(95.6% 0.214 114.3)

LABlab(96.37% -22.12 91.19)

LCHlch(96.37% 93.83 103.63)

What #EFFF0A 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 #EFFF0A, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Watermelon Yellow#EEFF1BΔE 1.79 Lemon Lime#E3FF00ΔE 4.91 Lemon Glacier#FDFF00ΔE 6.01 Dandelion#DDF719ΔE 6.79 Yellow#FFFF00ΔE 6.85 Yellow (RYB)#FEFE33ΔE 8.51

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

#EFFF0A Channel Values

How #EFFF0A breaks down in each color model. Hue is measured in degrees around the color wheel; saturation, lightness, and the CMYK inks are percentages.

Model	Channels	Notes
RGB	R 239 · G 255 · B 10	8-bit channels as sent to the display
HSL	H 64° · S 100% · L 52%	Easiest model for building lighter and darker variants
HSV	H 64° · S 96% · V 100%	Matches the picker in most design tools
CMYK	C 6% · M 0% · Y 96% · K 0%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	1.11:1 vs white · 18.98:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #EFFF0A 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 text1.11:1AA normal AA large AAA normal

TextBlack text18.98:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #EFFF0A in the contrast checker.

Colors That Go With #EFFF0A

Pairings derived from color-wheel relationships. The complementary color sits opposite #EFFF0A; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base

Complementary

Analogous

Analogous

Triadic

Triadic

Split comp.

Split comp.

Tints & Shades of #EFFF0A

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

Shades

Want a full 50-950 ramp with semantic roles? Generate design tokens from #EFFF0A.

How #EFFF0A 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#EFFF0A

Protanopia#FCFC0C

Protanomaly#F7FD0B

Deuteranopia#FAFA14

Deuteranomaly#F6FC10

Tritanopia#FEF0F0

Tritanomaly#F8F6C0

Achromatopsia#F3F3F3

Test a full palette in the color blindness simulator.

Using #EFFF0A in Code

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

CSS custom property--color-efff0a: #EFFF0A;

CSS backgroundbackground-color: #EFFF0A;

Tailwind configcolors: { 'color-efff0a': '#EFFF0A' }

SwiftUIColor(red: 0.937, green: 1.000, blue: 0.039)

Android XML<color name="color_efff0a">#EFFF0A</color>

SVG fillfill="#EFFF0A"

More Yellow Colors

#EFFF0A sits in the yellow family. These are its neighbours across that family's full range, each with its own breakdown.

181807 fffff5 1b1404 fffff0 1f1f00 ffffeb 242400 ffffe5 2a2913 ffffe0 2b2003 ffffd6 573a00 856514 b0a94f cc9900 e0e000 edeae0 f2f1e3 f8f3c9 fcfce8 ffcc00 fff000 ffff0f

#EFFF0A Frequently Asked Questions

What color is #EFFF0A?

#EFFF0A is a mid-tone yellow — rgb(239, 255, 10) in RGB and hsl(64, 100%, 52%) in HSL. It carries no registered color name of its own; the closest named color is Watermelon Yellow (#EEFF1B), which is below the threshold most people can see at a CIE76 distance of 1.79.

What is the RGB value of #EFFF0A?

#EFFF0A is rgb(239, 255, 10) — red 239, green 255, and blue 10 on the 0-255 scale.

What is the CMYK value of #EFFF0A?

#EFFF0A converts to approximately cmyk(6%, 0%, 96%, 0%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #EFFF0A be black or white?

Black text is the more readable choice. #EFFF0A scores 1.11:1 against white and 18.98:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #EFFF0A as a CSS color keyword?

No. #EFFF0A 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 yellow (#FFFF00) at a CIE76 distance of 6.85, which is clearly related but distinguishable side by side.

Open #EFFF0A in a Tool

Hex to RGB Hex to HSL Hex to CMYK Hex to OKLCH Hex to Pantone Build a palette Make a gradient

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