#281D39

#281D39

Color Values

HEX

#281D39

RGB

40, 29, 57

HSL

263.6, 32.6%, 16.9%

HSV

263.6, 49.1%, 22.4%

CMYK

29.8%, 49.1%, 0.0%, 77.6%

OKLCH

0.2584 0.0528 300.9

Properties

Cool Dark Nearest: RAL 5013 Cobalt Blue

Color Harmonies

Complementary

#281D39

#2E391D

Analogous

#1D2039

#361D39

#281D39

Triadic

#281D39

#39281D

#1D3928

Split Complementary

#281D39

#39361D

#20391D

Tetradic

#281D39

#391D20

#2E391D

#1D3936

Color Blindness Simulation

Original

#281D39

Protanopia

#232332

Deuteranopia

#242531

Tritanopia

#272D2C

Achromatopsia

#212121

CSS Usage

background-color: #281D39;
color: #281D39;
border-color: #281D39;
Nearest Tailwind: Slate 900 #0F172A

Tailwind Shades

50
#F7F5F9
100
#ECE8F2
200
#D9D0E7
300
#BEAED6
400
#9A82BF
500
#7756A9
600
#5F4587
700
#4C376C
800
#3B2B55
900
#2D223F
950
#1D1628

Contrast Checker

Text on white

15.85:1

AA Pass AAA Pass

Text on black

1.33:1

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