#181E3D

#181E3D

Color Values

HEX

#181E3D

RGB

24, 30, 61

HSL

230.3, 43.5%, 16.7%

HSV

230.3, 60.7%, 23.9%

CMYK

60.7%, 50.8%, 0.0%, 76.1%

OKLCH

0.2474 0.0592 273.1

Properties

Cool Dark Nearest: RAL 5013 Cobalt Blue

Color Harmonies

Complementary

#181E3D

#3D3718

Analogous

#18313D

#25183D

#181E3D

Triadic

#181E3D

#3D181E

#1E3D18

Split Complementary

#181E3D

#3D2518

#313D18

Tetradic

#181E3D

#3D1831

#3D3718

#183D25

Color Blindness Simulation

Original

#181E3D

Protanopia

#1B1B36

Deuteranopia

#1A1A34

Tritanopia

#18302E

Achromatopsia

#1F1F1F

CSS Usage

background-color: #181E3D;
color: #181E3D;
border-color: #181E3D;
Nearest Tailwind: Slate 900 #0F172A

Tailwind Shades

50
#F5F5FA
100
#E7E9F4
200
#CCD1EB
300
#A7B0DC
400
#7885CA
500
#485AB7
600
#3A4892
700
#2E3A75
800
#242D5B
900
#1D2443
950
#13162B

Contrast Checker

Text on white

16.25:1

AA Pass AAA Pass

Text on black

1.29:1

AA Fail AAA Fail

Related Articles

Tutorials

CSS color-mix(): Blend Colors Natively in the Browser

Jan 26, 2026
Tutorials

Building a Color Picker Web Component from Scratch

Jan 21, 2026
Tutorials

Perceptual Color Spaces: Lab, LCH, Oklab, OKLCH

Jan 15, 2026