#18183F

#18183F

Color Values

HEX

#18183F

RGB

24, 24, 63

HSL

240.0, 44.8%, 17.1%

HSV

240.0, 61.9%, 24.7%

CMYK

61.9%, 61.9%, 0.0%, 75.3%

OKLCH

0.2347 0.0725 279.2

Properties

Cool Dark Nearest: RAL 5002 Ultramarine Blue

Color Harmonies

Complementary

#18183F

#3F3F18

Analogous

#182C3F

#2C183F

#18183F

Triadic

#18183F

#3F1818

#183F18

Split Complementary

#18183F

#3F2C18

#2C3F18

Tetradic

#18183F

#3F182C

#3F3F18

#183F2C

Color Blindness Simulation

Original

#18183F

Protanopia

#181836

Deuteranopia

#181833

Tritanopia

#182E2C

Achromatopsia

#1B1B1B

CSS Usage

background-color: #18183F;
color: #18183F;
border-color: #18183F;
Nearest Tailwind: Indigo 950 #1E1B4B

Tailwind Shades

50
#F4F4FA
100
#E6E6F4
200
#CBCBEB
300
#A6A6DD
400
#7676CB
500
#4646B9
600
#383894
700
#2D2D76
800
#23235C
900
#1D1D44
950
#12122B

Contrast Checker

Text on white

16.92:1

AA Pass AAA Pass

Text on black

1.24:1

AA Fail AAA Fail

Related Articles

Tutorials

Building a Color Picker Web Component from Scratch

Feb 20, 2026
Tutorials

Web Color Performance: Gradients, Shadows, and Filters

Feb 19, 2026
Tutorials

Tailwind CSS Colors: Complete Shade System Guide

Feb 19, 2026