#18213D

#18213D

Color Values

HEX

#18213D

RGB

24, 33, 61

HSL

225.4, 43.5%, 16.7%

HSV

225.4, 60.7%, 23.9%

CMYK

60.7%, 45.9%, 0.0%, 76.1%

OKLCH

0.255 0.0545 268.9

Properties

Cool Dark Nearest: RAL 5013 Cobalt Blue

Color Harmonies

Complementary

#18213D

#3D3418

Analogous

#18343D

#22183D

#18213D

Triadic

#18213D

#3D1821

#213D18

Split Complementary

#18213D

#3D2218

#343D18

Tetradic

#18213D

#3D1834

#3D3418

#183D22

Color Blindness Simulation

Original

#18213D

Protanopia

#1C1C36

Deuteranopia

#1B1B35

Tritanopia

#183130

Achromatopsia

#212121

CSS Usage

background-color: #18213D;
color: #18213D;
border-color: #18213D;
Nearest Tailwind: Slate 900 #0F172A

Tailwind Shades

50
#F5F6FA
100
#E7EAF4
200
#CCD3EB
300
#A7B4DC
400
#788CCA
500
#4863B7
600
#3A4F92
700
#2E3F75
800
#24325B
900
#1D2743
950
#13182B

Contrast Checker

Text on white

15.86:1

AA Pass AAA Pass

Text on black

1.32:1

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