#3701CB Color

#3701CB is rgb(55, 1, 203) in RGB, hsl(256, 99%, 40%) in HSL, and about cmyk(73%, 100%, 0%, 20%) in CMYK. It has no registered color name of its own — the closest is Medium Blue (#0000CD), clearly related but distinguishable side by side at ΔE 6.2. White text is the more readable choice on this background.

#3701CB

HEX#3701CB

RGBrgb(55, 1, 203)

HSLhsl(256, 99%, 40%)

HSVhsv(256, 100%, 80%)

CMYKcmyk(73%, 100%, 0%, 20%)

OKLCHoklch(40.4% 0.251 275.9)

LABlab(25.24% 58.90 -89.48)

LCHlch(25.24% 107.12 303.35)

What #3701CB 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 #3701CB, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Medium Blue#0000CDΔE 6.2 Ultramarine Blue(caran D'ache)#2111EFΔE 14.91 Han Purple#5218FAΔE 16.16 Neon Blue#1B03A3ΔE 17.21 Violet (Caran D'ache)#6E00C0ΔE 17.62 Duke Blue#00009CΔE 19.2

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

#3701CB Channel Values

How #3701CB 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 55 · G 1 · B 203	8-bit channels as sent to the display
HSL	H 256° · S 99% · L 40%	Easiest model for building lighter and darker variants
HSV	H 256° · S 100% · V 80%	Matches the picker in most design tools
CMYK	C 73% · M 100% · Y 0% · K 20%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	10.35:1 vs white · 2.03:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #3701CB 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 text10.35:1AA normal AA large AAA normal

Fails AABlack text2.03:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #3701CB in the contrast checker.

Colors That Go With #3701CB

Pairings derived from color-wheel relationships. The complementary color sits opposite #3701CB; 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 #3701CB

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 #3701CB.

How #3701CB 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#3701CB

Protanopia#1414CB

Protanomaly#260DCB

Deuteranopia#1E1ECB

Deuteranomaly#2A16CB

Tritanopia#004E4E

Tritanomaly#003C91

Achromatopsia#404040

Test a full palette in the color blindness simulator.

Using #3701CB in Code

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

CSS custom property--color-3701cb: #3701CB;

CSS backgroundbackground-color: #3701CB;

Tailwind configcolors: { 'color-3701cb': '#3701CB' }

SwiftUIColor(red: 0.216, green: 0.004, blue: 0.796)

Android XML<color name="color_3701cb">#3701CB</color>

SVG fillfill="#3701CB"

More Purple Colors

#3701CB 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

#3701CB Frequently Asked Questions

What color is #3701CB?

#3701CB is a mid-tone purple — rgb(55, 1, 203) in RGB and hsl(256, 99%, 40%) in HSL. It carries no registered color name of its own; the closest named color is Medium Blue (#0000CD), which is clearly related but distinguishable side by side at a CIE76 distance of 6.2.

What is the RGB value of #3701CB?

#3701CB is rgb(55, 1, 203) — red 55, green 1, and blue 203 on the 0-255 scale.

What is the CMYK value of #3701CB?

#3701CB converts to approximately cmyk(73%, 100%, 0%, 20%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #3701CB be black or white?

White text is the more readable choice. #3701CB scores 10.35:1 against white and 2.03:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #3701CB as a CSS color keyword?

No. #3701CB 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 6.2, which is clearly related but distinguishable side by side.

Open #3701CB 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.