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#42FF91 Color

#42FF91 is rgb(66, 255, 145) in RGB, hsl(145, 100%, 63%) in HSL, and about cmyk(74%, 0%, 43%, 0%) in CMYK. It has no registered color name of its own — the closest is Medium Spring Green (#00FA9A), clearly related but distinguishable side by side at ΔE 7.54. Black text is the more readable choice on this background.

#42FF91
HEX#42FF91
RGBrgb(66, 255, 145)
HSLhsl(145, 100%, 63%)
HSVhsv(145, 74%, 100%)
CMYKcmyk(74%, 0%, 43%, 0%)
OKLCHoklch(88.4% 0.211 152.5)
LABlab(89.21% -65.85 38.65)
LCHlch(89.21% 76.35 149.59)

What #42FF91 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 #42FF91, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Medium Spring Green#00FA9AΔE 7.54Spring Green#00FF7FΔE 9.93Very Light Malachite Green#64E986ΔE 13.44Android Green#3DDC84ΔE 15.9Malachite#0BDA51ΔE 18.74Mint#98FF98ΔE 19.66

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

#42FF91 Channel Values

How #42FF91 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 1458-bit channels as sent to the display
HSLH 145° · S 100% · L 63%Easiest model for building lighter and darker variants
HSVH 145° · S 74% · V 100%Matches the picker in most design tools
CMYKC 74% · M 0% · Y 43% · K 0%Approximate ink mix; confirm with an ICC profile before printing
Luminance1.32:1 vs white · 15.94:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #42FF91 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 text1.32:1AA normal AA large AAA normal
TextBlack text15.94:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #42FF91 in the contrast checker.

Colors That Go With #42FF91

Pairings derived from color-wheel relationships. The complementary color sits opposite #42FF91; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#42FF91
Complementary
#FF42B0
Analogous
#52FF42
Analogous
#42FFEF
Triadic
#9142FF
Triadic
#FF9142
Split comp.
#EF42FF
Split comp.
#FF4252

Tints & Shades of #42FF91

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

#5CFFA0
#75FFAF
#8FFFBE
#A8FFCC
#C2FFDB
#DBFFEA

Shades

#1AFF79
#00EB62
#00C251
#00943E
#006B2D
#003D1A

Want a full 50-950 ramp with semantic roles? Generate design tokens from #42FF91.

How #42FF91 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#42FF91
Protanopia#ECEC92
Protanomaly#C0F492
Deuteranopia#D8D897
Deuteranomaly#B0E995
Tritanopia#6BF5F5
Tritanomaly#5DF9D4
Achromatopsia#E0E0E0

Test a full palette in the color blindness simulator.

Using #42FF91 in Code

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

CSS custom property--color-42ff91: #42FF91;
CSS backgroundbackground-color: #42FF91;
Tailwind configcolors: { 'color-42ff91': '#42FF91' }
SwiftUIColor(red: 0.259, green: 1.000, blue: 0.569)
Android XML<color name="color_42ff91">#42FF91</color>
SVG fillfill="#42FF91"

More Green Colors

#42FF91 sits in the green family. These are its neighbours across that family's full range, each with its own breakdown.

000200fdfff5001f00f7fee7002400f7fbf5002c22f5fffa002e00f5fff5003300f0fff000800000db870d542b20483f33cc6646c3995ea50072863991e0b7a3f5d8bcd7bcd1ffed

#42FF91 Frequently Asked Questions

What color is #42FF91?

#42FF91 is a light green — rgb(66, 255, 145) in RGB and hsl(145, 100%, 63%) in HSL. It carries no registered color name of its own; the closest named color is Medium Spring Green (#00FA9A), which is clearly related but distinguishable side by side at a CIE76 distance of 7.54.

What is the RGB value of #42FF91?

#42FF91 is rgb(66, 255, 145) — red 66, green 255, and blue 145 on the 0-255 scale.

What is the CMYK value of #42FF91?

#42FF91 converts to approximately cmyk(74%, 0%, 43%, 0%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #42FF91 be black or white?

Black text is the more readable choice. #42FF91 scores 1.32:1 against white and 15.94:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #42FF91 as a CSS color keyword?

No. #42FF91 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 mediumspringgreen (#00FA9A) at a CIE76 distance of 7.54, which is clearly related but distinguishable side by side.

Open #42FF91 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.