#40039B Color

#40039B is rgb(64, 3, 155) in RGB, hsl(264, 96%, 31%) in HSL, and about cmyk(59%, 98%, 0%, 39%) in CMYK. It has no registered color name of its own — the closest is Websafe Indigo (#330099), very hard to tell apart at ΔE 3.3. White text is the more readable choice on this background.

#40039B

HEX#40039B

RGBrgb(64, 3, 155)

HSLhsl(264, 96%, 31%)

HSVhsv(264, 98%, 61%)

CMYKcmyk(59%, 98%, 0%, 39%)

OKLCHoklch(35.4% 0.201 287.9)

LABlab(20.80% 49.56 -68.11)

LCHlch(20.80% 84.24 306.04)

What #40039B 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 #40039B, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Websafe Indigo#330099ΔE 3.3 Neon Blue#1B03A3ΔE 10.02 Blue Ribbon#0B10A2ΔE 10.27 Dark Blue#00008BΔE 10.39 Duke Blue#00009CΔE 11.07 Zaffer (Zaffre)#0014A8ΔE 11.89

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

#40039B Channel Values

How #40039B 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 64 · G 3 · B 155	8-bit channels as sent to the display
HSL	H 264° · S 96% · L 31%	Easiest model for building lighter and darker variants
HSV	H 264° · S 98% · V 61%	Matches the picker in most design tools
CMYK	C 59% · M 98% · Y 0% · K 39%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	12.32:1 vs white · 1.7:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #40039B 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.

TextWhite text12.32:1AA normal AA large AAA normal

Fails AABlack text1.7:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #40039B in the contrast checker.

Colors That Go With #40039B

Pairings derived from color-wheel relationships. The complementary color sits opposite #40039B; 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 #40039B

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 #40039B.

How #40039B 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#40039B

Protanopia#19199B

Protanomaly#2D129B

Deuteranopia#24249B

Deuteranomaly#311B9B

Tritanopia#193A3A

Tritanomaly#2D2C6E

Achromatopsia#353535

Test a full palette in the color blindness simulator.

Using #40039B in Code

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

CSS custom property--color-40039b: #40039B;

CSS backgroundbackground-color: #40039B;

Tailwind configcolors: { 'color-40039b': '#40039B' }

SwiftUIColor(red: 0.251, green: 0.012, blue: 0.608)

Android XML<color name="color_40039b">#40039B</color>

SVG fillfill="#40039B"

More Purple Colors

#40039B sits in the purple family. These are its neighbours across that family's full range, each with its own breakdown.

150024 fdf8ff 170b22 fdf4ff 1b0d35 faf5ff 1d0731 fae8ff 1e0033 f6cfff 20002e f3e8ff 300052 402060 541490 6600cc 7008e7 8806ce 9900cc a11fff b19cd9 c27aff cebeef e0b2eb

#40039B Frequently Asked Questions

What color is #40039B?

#40039B is a dark purple — rgb(64, 3, 155) in RGB and hsl(264, 96%, 31%) in HSL. It carries no registered color name of its own; the closest named color is Websafe Indigo (#330099), which is very hard to tell apart at a CIE76 distance of 3.3.

What is the RGB value of #40039B?

#40039B is rgb(64, 3, 155) — red 64, green 3, and blue 155 on the 0-255 scale.

What is the CMYK value of #40039B?

#40039B converts to approximately cmyk(59%, 98%, 0%, 39%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #40039B be black or white?

White text is the more readable choice. #40039B scores 12.32:1 against white and 1.7:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #40039B as a CSS color keyword?

No. #40039B 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 darkblue (#00008B) at a CIE76 distance of 10.39, which is visibly different.

Open #40039B 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 purple in the color library, the guide to shades of purple, or the full color library.