#151B5B Color

#151B5B is rgb(21, 27, 91) in RGB, hsl(235, 63%, 22%) in HSL, and about cmyk(77%, 70%, 0%, 64%) in CMYK. It has no registered color name of its own — the closest is Sapphire Navy (#082567), clearly related but distinguishable side by side at ΔE 6.04. White text is the more readable choice on this background.

#151B5B

HEX#151B5B

RGBrgb(21, 27, 91)

HSLhsl(235, 63%, 22%)

HSVhsv(235, 77%, 36%)

CMYKcmyk(77%, 70%, 0%, 64%)

OKLCHoklch(26.6% 0.113 271.9)

LABlab(13.15% 17.15 -40.02)

LCHlch(13.15% 43.54 293.20)

What #151B5B 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 #151B5B, ordered by CIE76 distance in CIELAB. Anything under about ΔE 2 is a difference most people cannot see.

Sapphire Navy#082567ΔE 6.04 St. Patrick's Blue#23297AΔE 11.4 Russian Violet#32174DΔE 12.88 Midnight Blue#191970ΔE 14.12 Cosmic Cobalt#2E2D88ΔE 17.33 Yale Blue#00356BΔE 17.33

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

#151B5B Channel Values

How #151B5B 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 21 · G 27 · B 91	8-bit channels as sent to the display
HSL	H 235° · S 63% · L 22%	Easiest model for building lighter and darker variants
HSV	H 235° · S 77% · V 36%	Matches the picker in most design tools
CMYK	C 77% · M 70% · Y 0% · K 64%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	15.67:1 vs white · 1.34:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a #151B5B 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 text15.67:1AA normal AA large AAA normal

Fails AABlack text1.34:1AA normal AA large AAA normal

Need a specific ratio against another background? Open #151B5B in the contrast checker.

Colors That Go With #151B5B

Pairings derived from color-wheel relationships. The complementary color sits opposite #151B5B; 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 #151B5B

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 #151B5B.

How #151B5B 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#151B5B

Protanopia#1A1A5B

Protanomaly#181A5B

Deuteranopia#19195B

Deuteranomaly#181A5B

Tritanopia#002A2A

Tritanomaly#012443

Achromatopsia#232323

Test a full palette in the color blindness simulator.

Using #151B5B in Code

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

CSS custom property--color-151b5b: #151B5B;

CSS backgroundbackground-color: #151B5B;

Tailwind configcolors: { 'color-151b5b': '#151B5B' }

SwiftUIColor(red: 0.082, green: 0.106, blue: 0.357)

Android XML<color name="color_151b5b">#151B5B</color>

SVG fillfill="#151B5B"

More Blue Colors

#151B5B sits in the blue family. These are its neighbours across that family's full range, each with its own breakdown.

000024 fafaff 00002e f9fafb 000033 f8fafc 000038 f8f8ff 000042 f5faff 000047 f5f5ff 002147 007dfa 0f52ba 1c39bb 2a3439 372aac 4e3cc3 64609a 7abdff 979aaa b8dbff d6d6ff

#151B5B Frequently Asked Questions

What color is #151B5B?

#151B5B is a dark blue — rgb(21, 27, 91) in RGB and hsl(235, 63%, 22%) in HSL. It carries no registered color name of its own; the closest named color is Sapphire Navy (#082567), which is clearly related but distinguishable side by side at a CIE76 distance of 6.04.

What is the RGB value of #151B5B?

#151B5B is rgb(21, 27, 91) — red 21, green 27, and blue 91 on the 0-255 scale.

What is the CMYK value of #151B5B?

#151B5B converts to approximately cmyk(77%, 70%, 0%, 64%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #151B5B be black or white?

White text is the more readable choice. #151B5B scores 15.67:1 against white and 1.34:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #151B5B as a CSS color keyword?

No. #151B5B 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 14.12, which is visibly different.

Open #151B5B 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.