#18187B Color

#18187B is rgb(24, 24, 123) in RGB, hsl(240, 67%, 29%) in HSL, and about cmyk(80%, 80%, 0%, 52%) in CMYK. It has no registered color name of its own — the closest is Resolution Blue (#002387), clearly related but distinguishable side by side at ΔE 6.15. White text is the more readable choice on this background.

#18187B

HEX#18187B

RGBrgb(24, 24, 123)

HSLhsl(240, 67%, 29%)

HSVhsv(240, 80%, 48%)

CMYKcmyk(80%, 80%, 0%, 52%)

OKLCHoklch(29.9% 0.159 271.4)

LABlab(15.79% 29.83 -56.55)

LCHlch(15.79% 63.93 297.81)

What #18187B 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 #18187B, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Resolution Blue#002387ΔE 6.15 Midnight Blue#191970ΔE 6.9 Persian Indigo#32127AΔE 7.05 Imperial Blue#002395ΔE 10.1 Cosmic Cobalt#2E2D88ΔE 10.67 Blue (Pigment)#333399ΔE 11.53

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

#18187B Channel Values

How #18187B 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 24 · G 24 · B 123	8-bit channels as sent to the display
HSL	H 240° · S 67% · L 29%	Easiest model for building lighter and darker variants
HSV	H 240° · S 80% · V 48%	Matches the picker in most design tools
CMYK	C 80% · M 80% · Y 0% · K 52%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	14.43:1 vs white · 1.46:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #18187B 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 text14.43:1AA normal AA large AAA normal

Fails AABlack text1.46:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #18187B in the contrast checker.

Colors That Go With #18187B

Pairings derived from color-wheel relationships. The complementary color sits opposite #18187B; 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 #18187B

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 #18187B.

How #18187B 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#18187B

Protanopia#18187B

Protanomaly#18187B

Deuteranopia#18187B

Deuteranomaly#18187B

Tritanopia#003333

Tritanomaly#002A59

Achromatopsia#2A2A2A

Test a full palette in the color blindness simulator.

Using #18187B in Code

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

CSS custom property--color-18187b: #18187B;

CSS backgroundbackground-color: #18187B;

Tailwind configcolors: { 'color-18187b': '#18187B' }

SwiftUIColor(red: 0.094, green: 0.094, blue: 0.482)

Android XML<color name="color_18187b">#18187B</color>

SVG fillfill="#18187B"

More Blue Colors

#18187B sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

181c20 173796 182d3e 172436 184fa1 162456 190b65 161664 191632 1560bd 191970 155dfc 23297a 3333cc 45556c 5b92e5 71a6d2 8ba8b7 a7b9f1 c5d4e7 e6e6fa 000070 0038a8 052f4a

#18187B Frequently Asked Questions

What color is #18187B?

#18187B is a dark blue — rgb(24, 24, 123) in RGB and hsl(240, 67%, 29%) in HSL. It carries no registered color name of its own; the closest named color is Resolution Blue (#002387), which is clearly related but distinguishable side by side at a CIE76 distance of 6.15.

What is the RGB value of #18187B?

#18187B is rgb(24, 24, 123) — red 24, green 24, and blue 123 on the 0-255 scale.

What is the CMYK value of #18187B?

#18187B converts to approximately cmyk(80%, 80%, 0%, 52%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #18187B be black or white?

White text is the more readable choice. #18187B scores 14.43:1 against white and 1.46:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #18187B as a CSS color keyword?

No. #18187B 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 midnightblue (#191970) at a CIE76 distance of 6.9, which is clearly related but distinguishable side by side.

Open #18187B in a Tool

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