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#42B7FF Color

#42B7FF is rgb(66, 183, 255) in RGB, hsl(203, 100%, 63%) in HSL, and about cmyk(74%, 28%, 0%, 0%) in CMYK. It has no registered color name of its own — the closest is Vivid Cerulean (#00AAEE), clearly related but distinguishable side by side at ΔE 6.34. Black text is the more readable choice on this background.

#42B7FF
HEX#42B7FF
RGBrgb(66, 183, 255)
HSLhsl(203, 100%, 63%)
HSVhsv(203, 74%, 100%)
CMYKcmyk(74%, 28%, 0%, 0%)
OKLCHoklch(74.6% 0.146 240.3)
LABlab(70.33% -15.72 -45.82)
LCHlch(70.33% 48.44 251.06)

What #42B7FF 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 #42B7FF, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Vivid Cerulean#00AAEEΔE 6.34Blue Jeans#5DADECΔE 8.09Microsoft Blue#00A2EDΔE 8.2Deep Sky Blue#00BFFFΔE 8.78Picton Blue#45B1E8ΔE 9.33Very Light Azure#74BBFBΔE 9.5

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

#42B7FF Channel Values

How #42B7FF 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 183 · B 2558-bit channels as sent to the display
HSLH 203° · S 100% · L 63%Easiest model for building lighter and darker variants
HSVH 203° · S 74% · V 100%Matches the picker in most design tools
CMYKC 74% · M 28% · Y 0% · K 0%Approximate ink mix; confirm with an ICC profile before printing
Luminance2.22:1 vs white · 9.45:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #42B7FF 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 text2.22:1AA normal AA large AAA normal
TextBlack text9.45:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #42B7FF in the contrast checker.

Colors That Go With #42B7FF

Pairings derived from color-wheel relationships. The complementary color sits opposite #42B7FF; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#42B7FF
Complementary
#FF8B42
Analogous
#42FFE9
Analogous
#4258FF
Triadic
#FF42B7
Triadic
#B7FF42
Split comp.
#FF4258
Split comp.
#FFE942

Tints & Shades of #42B7FF

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

#5CC0FF
#75CAFF
#8FD4FF
#A8DEFF
#C2E8FF
#DBF1FF

Shades

#1AA7FF
#0091EB
#0078C2
#005B94
#00426B
#00263D

Want a full 50-950 ramp with semantic roles? Generate design tokens from #42B7FF.

How #42B7FF 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#42B7FF
Protanopia#AAAAFF
Protanomaly#8CAFFF
Deuteranopia#9D9DFF
Deuteranomaly#82A8FF
Tritanopia#00C2C2
Tritanomaly#20BEDD
Achromatopsia#AEAEAE

Test a full palette in the color blindness simulator.

Using #42B7FF in Code

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

CSS custom property--color-42b7ff: #42B7FF;
CSS backgroundbackground-color: #42B7FF;
Tailwind configcolors: { 'color-42b7ff': '#42B7FF' }
SwiftUIColor(red: 0.259, green: 0.718, blue: 1.000)
Android XML<color name="color_42b7ff">#42B7FF</color>
SVG fillfill="#42B7FF"

More Blue Colors

#42B7FF sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

000024fafaff00002ef9fafb000033f8fafc000038f8f8ff000042f5faff000047f5f5ff002147007dfa0f52ba1c39bb2a3439372aac4e3cc364609a7abdff979aaab8dbffd6d6ff

#42B7FF Frequently Asked Questions

What color is #42B7FF?

#42B7FF is a light blue — rgb(66, 183, 255) in RGB and hsl(203, 100%, 63%) in HSL. It carries no registered color name of its own; the closest named color is Vivid Cerulean (#00AAEE), which is clearly related but distinguishable side by side at a CIE76 distance of 6.34.

What is the RGB value of #42B7FF?

#42B7FF is rgb(66, 183, 255) — red 66, green 183, and blue 255 on the 0-255 scale.

What is the CMYK value of #42B7FF?

#42B7FF converts to approximately cmyk(74%, 28%, 0%, 0%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #42B7FF be black or white?

Black text is the more readable choice. #42B7FF scores 2.22:1 against white and 9.45:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #42B7FF as a CSS color keyword?

No. #42B7FF 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 deepskyblue (#00BFFF) at a CIE76 distance of 8.78, which is clearly related but distinguishable side by side.

Open #42B7FF in a Tool

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

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