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#42FF78 Color

#42FF78 is rgb(66, 255, 120) in RGB, hsl(137, 100%, 63%) in HSL, and about cmyk(74%, 0%, 53%, 0%) in CMYK. It has no registered color name of its own — the closest is Spring Green (#00FF7F), clearly related but distinguishable side by side at ΔE 5.54. Black text is the more readable choice on this background.

#42FF78
HEX#42FF78
RGBrgb(66, 255, 120)
HSLhsl(137, 100%, 63%)
HSVhsv(137, 74%, 100%)
CMYKcmyk(74%, 0%, 53%, 0%)
OKLCHoklch(88% 0.232 148.2)
LABlab(88.94% -68.63 49.91)
LCHlch(88.94% 84.87 143.97)

What #42FF78 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 #42FF78, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Spring Green#00FF7FΔE 5.54Screamin' Green#66FF66ΔE 9.97Malachite#0BDA51ΔE 12.78Medium Spring Green#00FA9AΔE 18.41Vivid Malachite#00CC33ΔE 19.48Lime Green#32CD32ΔE 20.33

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

#42FF78 Channel Values

How #42FF78 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 66 · G 255 · B 1208-bit channels as sent to the display
HSLH 137° · S 100% · L 63%Easiest model for building lighter and darker variants
HSVH 137° · S 74% · V 100%Matches the picker in most design tools
CMYKC 74% · M 0% · Y 53% · K 0%Approximate ink mix; confirm with an ICC profile before printing
Luminance1.33:1 vs white · 15.81:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #42FF78 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 text1.33:1AA normal AA large AAA normal
TextBlack text15.81:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #42FF78 in the contrast checker.

Colors That Go With #42FF78

Pairings derived from color-wheel relationships. The complementary color sits opposite #42FF78; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#42FF78
Complementary
#FF42CA
Analogous
#6BFF42
Analogous
#42FFD6
Triadic
#7842FF
Triadic
#FF7842
Split comp.
#D642FF
Split comp.
#FF426B

Tints & Shades of #42FF78

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

#5CFF8A
#75FF9C
#8FFFAF
#A8FFC1
#C2FFD3
#DBFFE5

Shades

#1AFF5B
#00EB42
#00C237
#00942A
#006B1E
#003D11

Want a full 50-950 ramp with semantic roles? Generate design tokens from #42FF78.

How #42FF78 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#42FF78
Protanopia#ECEC79
Protanomaly#C0F479
Deuteranopia#D8D880
Deuteranomaly#B0E97D
Tritanopia#6FF3F3
Tritanomaly#60F8CD
Achromatopsia#DFDFDF

Test a full palette in the color blindness simulator.

Using #42FF78 in Code

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

CSS custom property--color-42ff78: #42FF78;
CSS backgroundbackground-color: #42FF78;
Tailwind configcolors: { 'color-42ff78': '#42FF78' }
SwiftUIColor(red: 0.259, green: 1.000, blue: 0.471)
Android XML<color name="color_42ff78">#42FF78</color>
SVG fillfill="#42FF78"

More Green Colors

#42FF78 sits in the green family. These are its neighbours across that family's full range, each with its own breakdown.

000200fdfff5001f00f7fee7002400f7fbf5002c22f5fffa002e00f5fff5003300f0fff000800000db870d542b20483f33cc6646c3995ea50072863991e0b7a3f5d8bcd7bcd1ffed

#42FF78 Frequently Asked Questions

What color is #42FF78?

#42FF78 is a light green — rgb(66, 255, 120) in RGB and hsl(137, 100%, 63%) in HSL. It carries no registered color name of its own; the closest named color is Spring Green (#00FF7F), which is clearly related but distinguishable side by side at a CIE76 distance of 5.54.

What is the RGB value of #42FF78?

#42FF78 is rgb(66, 255, 120) — red 66, green 255, and blue 120 on the 0-255 scale.

What is the CMYK value of #42FF78?

#42FF78 converts to approximately cmyk(74%, 0%, 53%, 0%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #42FF78 be black or white?

Black text is the more readable choice. #42FF78 scores 1.33:1 against white and 15.81:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #42FF78 as a CSS color keyword?

No. #42FF78 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 springgreen (#00FF7F) at a CIE76 distance of 5.54, which is clearly related but distinguishable side by side.

Open #42FF78 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.