#370DB5 Color

#370DB5 is rgb(55, 13, 181) in RGB, hsl(255, 87%, 38%) in HSL, and about cmyk(70%, 93%, 0%, 29%) in CMYK. It has no registered color name of its own — the closest is Neon Blue (#1B03A3), clearly related but distinguishable side by side at ΔE 6.52. White text is the more readable choice on this background.

#370DB5

HEX#370DB5

RGBrgb(55, 13, 181)

HSLhsl(255, 87%, 38%)

HSVhsv(255, 93%, 71%)

CMYKcmyk(70%, 93%, 0%, 29%)

OKLCHoklch(38.2% 0.225 278.4)

LABlab(23.47% 51.80 -79.43)

LCHlch(23.47% 94.83 303.11)

What #370DB5 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 #370DB5, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Neon Blue#1B03A3ΔE 6.52 Zaffer (Zaffre)#0014A8ΔE 9.22 Duke Blue#00009CΔE 9.27 Blue Ribbon#0B10A2ΔE 9.88 Websafe Indigo#330099ΔE 10.6 Blue (Pantone)#0018A8ΔE 10.78

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

#370DB5 Channel Values

How #370DB5 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 13 · B 181	8-bit channels as sent to the display
HSL	H 255° · S 87% · L 38%	Easiest model for building lighter and darker variants
HSV	H 255° · S 93% · V 71%	Matches the picker in most design tools
CMYK	C 70% · M 93% · Y 0% · K 29%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	11.13:1 vs white · 1.89:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #370DB5 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 text11.13:1AA normal AA large AAA normal

Fails AABlack text1.89:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #370DB5 in the contrast checker.

Colors That Go With #370DB5

Pairings derived from color-wheel relationships. The complementary color sits opposite #370DB5; 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 #370DB5

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 #370DB5.

How #370DB5 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#370DB5

Protanopia#1919B5

Protanomaly#2815B5

Deuteranopia#2121B5

Deuteranomaly#2B1BB5

Tritanopia#004646

Tritanomaly#0B3782

Achromatopsia#3B3B3B

Test a full palette in the color blindness simulator.

Using #370DB5 in Code

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

CSS custom property--color-370db5: #370DB5;

CSS backgroundbackground-color: #370DB5;

Tailwind configcolors: { 'color-370db5': '#370DB5' }

SwiftUIColor(red: 0.216, green: 0.051, blue: 0.710)

Android XML<color name="color_370db5">#370DB5</color>

SVG fillfill="#370DB5"

More Purple Colors

#370DB5 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

#370DB5 Frequently Asked Questions

What color is #370DB5?

#370DB5 is a dark purple — rgb(55, 13, 181) in RGB and hsl(255, 87%, 38%) in HSL. It carries no registered color name of its own; the closest named color is Neon Blue (#1B03A3), which is clearly related but distinguishable side by side at a CIE76 distance of 6.52.

What is the RGB value of #370DB5?

#370DB5 is rgb(55, 13, 181) — red 55, green 13, and blue 181 on the 0-255 scale.

What is the CMYK value of #370DB5?

#370DB5 converts to approximately cmyk(70%, 93%, 0%, 29%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #370DB5 be black or white?

White text is the more readable choice. #370DB5 scores 11.13:1 against white and 1.89:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #370DB5 as a CSS color keyword?

No. #370DB5 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 15.62, which is visibly different.

Open #370DB5 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.