#EFF939 Color

#EFF939 is rgb(239, 249, 57) in RGB, hsl(63, 94%, 60%) in HSL, and about cmyk(4%, 0%, 77%, 2%) in CMYK. It has no registered color name of its own — the closest is Maximum Yellow (#FAFA37), very hard to tell apart at ΔE 4.48. Black text is the more readable choice on this background.

#EFF939

HEX#EFF939

RGBrgb(239, 249, 57)

HSLhsl(63, 94%, 60%)

HSVhsv(63, 77%, 98%)

CMYKcmyk(4%, 0%, 77%, 2%)

OKLCHoklch(94.4% 0.196 112.7)

LABlab(94.89% -18.76 82.29)

LCHlch(94.89% 84.40 102.84)

What #EFF939 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 #EFF939, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Maximum Yellow#FAFA37ΔE 4.48 Yellow (RYB)#FEFE33ΔE 6.01 Xanthic#EEED09ΔE 7.75 Watermelon Yellow#EEFF1BΔE 8.11 Dandelion#DDF719ΔE 8.28 Peridot#E6E200ΔE 9.74

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

#EFF939 Channel Values

How #EFF939 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 249 · B 57	8-bit channels as sent to the display
HSL	H 63° · S 94% · L 60%	Easiest model for building lighter and darker variants
HSV	H 63° · S 77% · V 98%	Matches the picker in most design tools
CMYK	C 4% · M 0% · Y 77% · K 2%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	1.15:1 vs white · 18.28:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #EFF939 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 text1.15:1AA normal AA large AAA normal

TextBlack text18.28:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #EFF939 in the contrast checker.

Colors That Go With #EFF939

Pairings derived from color-wheel relationships. The complementary color sits opposite #EFF939; 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 #EFF939

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 #EFF939.

How #EFF939 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#EFF939

Protanopia#F7F739

Protanomaly#F4F839

Deuteranopia#F6F63B

Deuteranomaly#F3F73A

Tritanopia#FDEBEB

Tritanomaly#F7F1BE

Achromatopsia#EFEFEF

Test a full palette in the color blindness simulator.

Using #EFF939 in Code

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

CSS custom property--color-eff939: #EFF939;

CSS backgroundbackground-color: #EFF939;

Tailwind configcolors: { 'color-eff939': '#EFF939' }

SwiftUIColor(red: 0.937, green: 0.976, blue: 0.224)

Android XML<color name="color_eff939">#EFF939</color>

SVG fillfill="#EFF939"

More Yellow Colors

#EFF939 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

#EFF939 Frequently Asked Questions

What color is #EFF939?

#EFF939 is a light yellow — rgb(239, 249, 57) in RGB and hsl(63, 94%, 60%) in HSL. It carries no registered color name of its own; the closest named color is Maximum Yellow (#FAFA37), which is very hard to tell apart at a CIE76 distance of 4.48.

What is the RGB value of #EFF939?

#EFF939 is rgb(239, 249, 57) — red 239, green 249, and blue 57 on the 0-255 scale.

What is the CMYK value of #EFF939?

#EFF939 converts to approximately cmyk(4%, 0%, 77%, 2%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #EFF939 be black or white?

Black text is the more readable choice. #EFF939 scores 1.15:1 against white and 18.28:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #EFF939 as a CSS color keyword?

No. #EFF939 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 11.82, which is visibly different.

Open #EFF939 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.