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#663BC9 Color

#663BC9 is rgb(102, 59, 201) in RGB, hsl(258, 57%, 51%) in HSL, and about cmyk(49%, 71%, 0%, 21%) in CMYK. It has no registered color name of its own — the closest is Majorelle Blue (#6050DC), clearly related but distinguishable side by side at ΔE 9.74. White text is the more readable choice on this background.

#663BC9
HEX#663BC9
RGBrgb(102, 59, 201)
HSLhsl(258, 57%, 51%)
HSVhsv(258, 71%, 79%)
CMYKcmyk(49%, 71%, 0%, 21%)
OKLCHoklch(48.9% 0.206 290.6)
LABlab(37.17% 44.61 -68.41)
LCHlch(37.17% 81.67 303.11)

What #663BC9 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 #663BC9, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Majorelle Blue#6050DCΔE 9.74Iris#5A4FCFΔE 12.58Iridescent Indigo#3C32CDΔE 12.63Lavender Indigo#9457EBΔE 13.5Grape#6F2DA8ΔE 14.19Persian Blue#1C39BBΔE 16.38

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

#663BC9 Channel Values

How #663BC9 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 102 · G 59 · B 2018-bit channels as sent to the display
HSLH 258° · S 57% · L 51%Easiest model for building lighter and darker variants
HSVH 258° · S 71% · V 79%Matches the picker in most design tools
CMYKC 49% · M 71% · Y 0% · K 21%Approximate ink mix; confirm with an ICC profile before printing
Luminance6.92:1 vs white · 3.03:1 vs blackWCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #663BC9 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 text6.92:1AA normal AA large AAA normal
Fails AABlack text3.03:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #663BC9 in the contrast checker.

Colors That Go With #663BC9

Pairings derived from color-wheel relationships. The complementary color sits opposite #663BC9; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base
#663BC9
Complementary
#9FC93B
Analogous
#3B57C9
Analogous
#AD3BC9
Triadic
#C9663B
Triadic
#3BC966
Split comp.
#C9AD3B
Split comp.
#57C93B

Tints & Shades of #663BC9

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

#7B57D1
#8E6FD8
#A48BDF
#BAA7E7
#D0C3EF
#E3DBF5

Shades

#5730B0
#4B2A98
#3D227C
#2F1A60
#211344
#160C2C

Want a full 50-950 ramp with semantic roles? Generate design tokens from #663BC9.

How #663BC9 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#663BC9
Protanopia#4545C9
Protanomaly#5441C9
Deuteranopia#4C4CC9
Deuteranomaly#5846C9
Tritanopia#485E5E
Tritanomaly#555295
Achromatopsia#5A5A5A

Test a full palette in the color blindness simulator.

Using #663BC9 in Code

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

CSS custom property--color-663bc9: #663BC9;
CSS backgroundbackground-color: #663BC9;
Tailwind configcolors: { 'color-663bc9': '#663BC9' }
SwiftUIColor(red: 0.400, green: 0.231, blue: 0.788)
Android XML<color name="color_663bc9">#663BC9</color>
SVG fillfill="#663BC9"

More Purple Colors

#663BC9 sits in the purple family. These are its neighbours across that family's full range, each with its own breakdown.

150024fdf8ff170b22fdf4ff1b0d35faf5ff1d0731fae8ff1e0033f6cfff20002ef3e8ff3000524020605414906600cc7008e78806ce9900cca11fffb19cd9c27affcebeefe0b2eb

#663BC9 Frequently Asked Questions

What color is #663BC9?

#663BC9 is a mid-tone purple — rgb(102, 59, 201) in RGB and hsl(258, 57%, 51%) in HSL. It carries no registered color name of its own; the closest named color is Majorelle Blue (#6050DC), which is clearly related but distinguishable side by side at a CIE76 distance of 9.74.

What is the RGB value of #663BC9?

#663BC9 is rgb(102, 59, 201) — red 102, green 59, and blue 201 on the 0-255 scale.

What is the CMYK value of #663BC9?

#663BC9 converts to approximately cmyk(49%, 71%, 0%, 21%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #663BC9 be black or white?

White text is the more readable choice. #663BC9 scores 6.92:1 against white and 3.03:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #663BC9 as a CSS color keyword?

No. #663BC9 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 mediumslateblue (#7B68EE) at a CIE76 distance of 17.85, which is visibly different.

Open #663BC9 in a Tool

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

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