#3333FF Color

#3333FF is rgb(51, 51, 255) in RGB, hsl(240, 100%, 60%) in HSL, and about cmyk(80%, 80%, 0%, 0%) in CMYK. It has no registered color name of its own — the closest is Ultramarine Blue(caran D'ache) (#2111EF), visibly different at ΔE 10.51. White text is the more readable choice on this background.

#3333FF

HEX#3333FF

RGBrgb(51, 51, 255)

HSLhsl(240, 100%, 60%)

HSVhsv(240, 80%, 100%)

CMYKcmyk(80%, 80%, 0%, 0%)

OKLCHoklch(49.7% 0.283 269.8)

LABlab(36.31% 55.02 -100.73)

LCHlch(36.31% 114.77 298.64)

What #3333FF 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 #3333FF, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Ultramarine Blue(caran D'ache)#2111EFΔE 10.51 Han Purple#5218FAΔE 10.97 Medium Blue#0000CDΔE 15.08 Indigo (Color Wheel)#4000FFΔE 16.73 Ultramarine#3F00FFΔE 16.76 Electric Indigo#6F00FFΔE 18.09

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

#3333FF Channel Values

How #3333FF 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 51 · G 51 · B 255	8-bit channels as sent to the display
HSL	H 240° · S 100% · L 60%	Easiest model for building lighter and darker variants
HSV	H 240° · S 80% · V 100%	Matches the picker in most design tools
CMYK	C 80% · M 80% · Y 0% · K 0%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	6.87:1 vs white · 3.06:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #3333FF 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 text6.87:1AA normal AA large AAA normal

Fails AABlack text3.06:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #3333FF in the contrast checker.

Colors That Go With #3333FF

Pairings derived from color-wheel relationships. The complementary color sits opposite #3333FF; 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 #3333FF

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 #3333FF.

How #3333FF 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#3333FF

Protanopia#3333FF

Protanomaly#3333FF

Deuteranopia#3333FF

Deuteranomaly#3333FF

Tritanopia#006E6E

Tritanomaly#005CBA

Achromatopsia#5A5A5A

Test a full palette in the color blindness simulator.

Using #3333FF in Code

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

CSS custom property--color-3333ff: #3333FF;

CSS backgroundbackground-color: #3333FF;

Tailwind configcolors: { 'color-3333ff': '#3333FF' }

SwiftUIColor(red: 0.200, green: 0.200, blue: 1.000)

Android XML<color name="color_3333ff">#3333FF</color>

SVG fillfill="#3333FF"

More Blue Colors

#3333FF sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

336084 3333cc 336699 333399 3366cc 333366 3366ff 3300ff 3399cc 32527b 3399ff 324ab2 456fa5 5c5cff 72a0c1 8c7af0 a7dbfb c6d2ff e7e3fc 00007a 00416a 054a76 154cb2 213d54

#3333FF Frequently Asked Questions

What color is #3333FF?

#3333FF is a light blue — rgb(51, 51, 255) in RGB and hsl(240, 100%, 60%) in HSL. It carries no registered color name of its own; the closest named color is Ultramarine Blue(caran D'ache) (#2111EF), which is visibly different at a CIE76 distance of 10.51.

What is the RGB value of #3333FF?

#3333FF is rgb(51, 51, 255) — red 51, green 51, and blue 255 on the 0-255 scale.

What is the CMYK value of #3333FF?

#3333FF converts to approximately cmyk(80%, 80%, 0%, 0%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #3333FF be black or white?

White text is the more readable choice. #3333FF scores 6.87:1 against white and 3.06:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #3333FF as a CSS color keyword?

No. #3333FF 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 mediumblue (#0000CD) at a CIE76 distance of 15.08, which is visibly different.

Open #3333FF 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 blue in the color library, the guide to shades of blue, or the full color library.