#181721

#181721

Color Values

HEX

#181721

RGB

24, 23, 33

HSL

246.0, 17.9%, 11.0%

HSV

246.0, 30.3%, 12.9%

CMYK

27.3%, 30.3%, 0.0%, 87.1%

OKLCH

0.2106 0.0196 289.2

Properties

Cool Dark Nearest: RAL 5004 Black Blue

Color Harmonies

Complementary

#181721

#202117

Analogous

#171B21

#1D1721

#181721

Triadic

#181721

#211817

#172118

Split Complementary

#181721

#211D17

#1B2117

Tetradic

#181721

#21171B

#202117

#17211D

Color Blindness Simulation

Original

#181721

Protanopia

#18181F

Deuteranopia

#18181E

Tritanopia

#181D1C

Achromatopsia

#181818

CSS Usage

background-color: #181721;
color: #181721;
border-color: #181721;
Nearest Tailwind: Gray 900 #111827

Tailwind Shades

50
#F6F6F9
100
#EBEAF0
200
#D6D5E2
300
#B9B7CD
400
#9390B2
500
#6D6996
600
#575478
700
#464360
800
#37344B
900
#2A2938
950
#1B1A24

Contrast Checker

Text on white

17.75:1

AA Pass AAA Pass

Text on black

1.18:1

AA Fail AAA Fail

Related Articles

Tutorials

Responsive Color: Adapting Colors for Different Screens

Jan 23, 2026
Tutorials

Color for Data Storytelling: Beyond Default Chart Colors

Jan 21, 2026
Tutorials

How to Choose Brand Colors: A Step-by-Step Guide

Jan 18, 2026